LOOP - Loopback Protocol
What is LOOPBACK Interface?
The LOOPBACK Interface is a virtual network interface used by a host to communicate with itself. It is part of the Internet Protocol (IP) suite and is typically assigned the IP address 127.0.0.1 in IPv4 or ::1 in IPv6.
Why is the LOOPBACK Interface Useful?
Allows testing and development without requiring physical network hardware.
Used by applications and services to communicate internally on the same machine.
Helps in diagnosing network issues.
Ensures network software can function even without external connectivity.
How it works?
Application sends data to the loopback address.
IP stack recognizes the destination as local.
Data is looped back internally without leaving the host.
Receiving application on the same host gets the data.
Where is LOOPBACK Interface used?
Web servers (e.g., testing a site on http://127.0.0.1).
Database connections (e.g., connecting to localhost).
Software development and debugging.
Health checks for services running on the same machine.
Which OSI layer does the LOOPBACK Interface operate at?
The LOOPBACK Interface is part of the IP protocol, which operates at Layer 3 (Network Layer).
It handles IP addressing and routing, even though the route is internal.
It ensures logical addressing and packet delivery within the host.
Topics in this section,
In this section, you are going to learn
Terminology
Version Info
IP Version |
RFC Number |
Core Idea / Contribution |
Year |
|---|---|---|---|
IPv4 Loopback |
RFC 1122 |
Defined 127.0.0.1 as the loopback address, used for internal host communication. |
1989 |
IPv6 Loopback |
RFC 4291 |
Defined ::1bas the loopback in ipv6 ,part of the ipv6 addressing architecture |
2006 |
Loopback Interface Behavior |
RFC 3330 (obsoleted by RFC 5735, then RFC 6890) |
Reserved the 127.0.0.0/8 block for loopback; clarified its use and routing behavior. |
20022013 |
Special-Purpose IP Address Blocks |
RFC 6890 |
Consolidated and updated definitions for special-use IP addresses, including loopback. |
2013 |
Setup
Setup
LOOPBACK Packet
S.No |
Protocol Packet |
Description |
Size(Bytes) |
|---|---|---|---|
1 |
Loopback Packet |
A packet sent from a host to itself using the loopback interface (127.0.0.1). |
4060 (IPv4) |
Version |
IP version (IPv4 or IPv6) |
1 |
|
Source IP Address |
Always 127.0.0.1 (IPv4) or ::1 (IPv6) |
4 (IPv4) / 16 (IPv6) |
|
Destination IP Address |
Same as source (127.0.0.1 or ::1) |
16-Apr |
|
Header Length |
Length of the IP header |
1 |
|
Total Length |
Total size of the packet |
2 |
|
Protocol |
Indicates the upper-layer protocol (e.g., TCP = 6, UDP = 17) |
1 |
|
TTL (Time to Live) |
Set to a default value (e.g., 64), decremented by routers (not used here) |
1 |
|
Payload |
Data being sent to the local application |
variable |
S.No |
Use Case |
Description |
|---|---|---|
1 |
Localhost Testing |
Used by developers to test applications locally without external network access. |
2 |
Internal Communication |
Enables processes on the same machine to communicate via IP without a network. |
3 |
Web Server Development |
Hosts web services on 127.0.0.1 fro local development and bedugging. |
4 |
Database Connectivity |
Connects applications to local databases using localhost or |
127.0.01. |
||
5 |
Service Health Checks |
Used by monitoring tools to verify if local services are running properly. |
6 |
Security Isolation |
Prevents exposure of services to external networks while allowing local access. |
7 |
Performance Benchmarking |
Measures application performance without network latency interference. |
8 |
Container Networking |
Containers use loopback for internal communication and service discovery. |
9 |
Virtualization Environments |
VMs and hypervisors use loopback for host-guest communication. |
10 |
OS and Kernel Testing |
Used in operating system development to test network stack behavior. |
S.No |
Feature |
Description |
|---|---|---|
1 |
Local Communication |
Enables communication between processes on the same host without external networking. |
2 |
Virtual Interface |
Operates as a software-based interface, not tied to any physical hardware. |
3 |
Reserved Address Space |
Uses 127.0.0.0/8 in IPV4 and ::1 in IPV6 for loopback communication. |
4 |
No External Routing |
Packets sent to loopback addresses never leave the host or reach the network. |
5 |
Protocol Testing |
Used for testing IP stack implementations and application behavior. |
6 |
Service Isolation |
Allows services to be accessible only locally, enhancing security. |
7 |
IPv4 and IPv6 Support |
Fully supports both IP versions for internal communication. |
8 |
Application Development |
Commonly used in development environments for testing web, database, and API services. |
9 |
Performance Benchmarking |
Eliminates network latency, useful for measuring raw application performance. |
10 |
System Health Monitoring |
Used by monitoring tools to check the status of local services and daemons. |
Local Communication - Testcases
S.No |
Test Case |
Description |
Expected Result |
|---|---|---|---|
1 |
Loopback Ping |
Ping 127.0.0.1 |
Reply received |
2 |
Loopback Interface Up |
Check if loopback interface is active |
Interface is up |
3 |
Bind Server to Loopback |
Start server on 127.0.0.1 |
Server binds successfully |
4 |
Connect Client to Loopback |
Connect client to 127.0.0.1 |
Connection successful |
5 |
External Access to Loopback |
Access 127.0.0.1 from another host |
Access denied |
6 |
DNS Resolution |
Resolve localhost |
Resolves to 127.0.0.1 |
7 |
Loopback Port Listening |
Check open port on 127.0.0.1 |
Port is open |
8 |
Packet Capture |
Capture packets to 127.0.0.1 |
Packets visible on loopback |
9 |
IPv6 Loopback Ping |
Ping ::1 |
Reply received |
10 |
Loopback Firewall |
Check firewall rules |
Loopback traffic allowed |
11 |
Loopback Isolation |
Ensure traffic doesnt leave host |
No external traffic |
12 |
TCP on Loopback |
Establish TCP connection |
Connection successful |
13 |
UDP on Loopback |
Send UDP packet |
Packet received |
14 |
ICMP on Loopback |
Send ICMP echo |
Echo reply received |
15 |
Loopback MTU |
Check MTU size |
Default MTU (e.g., 65536) |
16 |
Loopback Interface Name |
Get interface name |
lo or Loopback |
17 |
Loopback Interface Type |
Get interface type |
Loopback |
18 |
Loopback Interface Stats |
Check packet stats |
Packets counted |
19 |
Loopback Interface Down |
Bring interface down |
Operation restricted |
20 |
Loopback Routing Table |
Check route to 127.0.0.0/8 |
Route exists |
21 |
Loopback ARP |
Check ARP for 127.0.0.1 |
No ARP entry |
22 |
Loopback Broadcast |
Send broadcast to 127.255.255.255 |
Not supported |
23 |
Loopback Multicast |
Send multicast to 127.0.0.1 |
Not supported |
24 |
Loopback DNS IPv6 |
Resolve localhost to IPv6 |
Resolves to ::1 |
25 |
Loopback IPv6 TCP |
TCP connection to ::1 |
Connection successful |
26 |
Loopback IPv6 UDP |
Send UDP to ::1 |
Packet received |
27 |
Loopback IPv6 ICMP |
Ping ::1 |
Echo reply received |
28 |
Loopback IPv6 Routing |
Check route to ::1 |
Route exists |
29 |
Loopback IPv6 Stats |
Check ::1 stats |
Packets counted |
30 |
Loopback IPv6 Port Listening |
Check service on ::1 |
Port is open |
31 |
Loopback IPv6 Packet Capture |
Capture packets to ::1 |
Packets visible |
32 |
Loopback IPv6 Isolation |
Ensure ::1 traffic is local |
No external leakage |
33 |
Loopback IPv6 Interface Name |
Get interface name |
Same as IPv4 |
34 |
Loopback IPv6 Interface Type |
Get interface type |
Loopback |
35 |
Loopback IPv6 Interface Down |
Bring down ::1 interface |
Operation restricted |
36 |
Loopback IPv6 Firewall |
Check firewall for ::1 |
Traffic allowed |
37 |
Loopback IPv6 DNS Resolution |
Resolve localhost |
Returns ::1 |
38 |
Loopback IPv6 Application Binding |
Bind app to ::1 |
Successful |
39 |
Loopback IPv6 External Access |
Access ::1 externally |
Access denied |
40 |
Loopback Interface Speed |
Check speed |
Not applicable |
41 |
Loopback MAC Address |
Check MAC address |
None assigned |
42 |
Loopback Promiscuous Mode |
Enable promiscuous mode |
No effect |
43 |
Loopback Interface Reset |
Reset loopback interface |
Interface resets |
44 |
Loopback Interface Reconfigure |
Change loopback IP |
Change successful |
45 |
Loopback Interface Alias |
Add alias to loopback |
Alias works |
46 |
Loopback Interface Monitoring |
Monitor traffic |
Only local traffic |
47 |
Loopback Interface Logging |
Enable logging |
Logs generated |
48 |
Loopback Interface Security |
Apply security policy |
Policy enforced |
49 |
Loopback Interface Load Test |
High volume traffic |
No packet loss |
50 |
Loopback Interface Stress Test |
Continuous ping |
Stable response |
Virtual Interface - Testcases
S.No |
Test Case |
Description |
Expected Result |
|---|---|---|---|
1 |
Create Virtual Loopback Interface |
Create a virtual loopback interface (e.g., lo:0) |
Interface created successfully |
2 |
Assign IP to Virtual Interface |
Assign IP address to lo:0 |
IP assigned successfully |
3 |
Ping Virtual Interface |
Ping the IP assigned to lo:0 |
Ping successful |
4 |
Check Interface Status |
Verify lo:0 is up |
Interface is up |
5 |
Check Interface in ifconfig |
Run ifconfig to list lo:0 |
lo:0 appears in output |
6 |
Check Interface in ip addr |
Run ip addr to list lo:0 |
lo:0 appears in output |
7 |
Bind Service to Virtual Interface |
Bind a service to lo:0 IP |
Service binds successfully |
8 |
Connect to Service on Virtual Interface |
Connect client to service on lo:0 |
Connection successful |
9 |
Check Routing Table |
Verify route to lo:0 IP exists |
Route is present |
10 |
Check Interface Isolation |
Ensure lo:0 traffic is local |
No external traffic |
11 |
Capture Packets on Virtual Interface |
Use tcpdump on lo:0 |
Packets captured |
12 |
Check Interface Statistics |
Check RX/TX stats for lo:0 |
Stats are updated |
13 |
Disable Virtual Interface |
Bring down lo:0 |
Interface is down |
14 |
Re-enable Virtual Interface |
Bring up lo:0 |
Interface is up |
15 |
Delete Virtual Interface |
Remove lo:0 |
Interface removed |
16 |
Check Interface Persistence |
Reboot and check lo:0 |
Interface not persistent |
17 |
Add Interface via Script |
Create lo:0 using script |
Script executes successfully |
18 |
Assign Multiple IPs |
Assign multiple IPs to lo:0 |
All IPs assigned |
19 |
Check IP Conflict |
Assign same IP to lo and lo:0 |
Conflict detected |
20 |
Firewall Rules for Virtual Interface |
Apply firewall rule to lo:0 |
Rule enforced |
21 |
Check Loopback Isolation |
Ensure lo:0 traffic doesn’t leak |
Traffic is isolated |
22 |
DNS Binding to Virtual Interface |
Bind DNS server to lo:0 |
DNS server responds |
23 |
Web Server on Virtual Interface |
Run web server on lo:0 |
Accessible via lo:0 IP |
24 |
SSH Binding to Virtual Interface |
Bind SSH to lo:0 |
SSH accessible locally |
25 |
Check Interface Speed |
Query speed of lo:0 |
Speed not applicable |
26 |
Check Interface Type |
Verify type of lo:0 |
Type is loopback |
27 |
Check Interface Flags |
Check flags for lo:0 |
Flags include LOOPBACK |
28 |
Monitor Interface Traffic |
Use monitoring tool on lo:0 |
Traffic monitored |
29 |
Stress Test Virtual Interface |
Send high volume traffic |
No packet loss |
30 |
Check Interface MTU |
Query MTU of lo:0 |
MTU is 65536 |
31 |
Change MTU |
Set different MTU on lo:0 |
MTU updated |
32 |
Check Promiscuous Mode |
Enable promiscuous mode |
No effect on lo:0 |
33 |
Check Interface Logs |
Enable logging for lo:0 |
Logs generated |
34 |
Check Interface Errors |
Inject error packets |
Errors logged |
35 |
Check Interface Aliases |
Create lo:1, lo:2 |
Aliases created |
36 |
Check Interface Load Balancing |
Distribute traffic across lo aliases |
Traffic balanced |
37 |
Check Interface Binding Priority |
Bind service to multiple lo aliases |
Priority respected |
38 |
Check Interface in netstat |
Run netstat for lo:0 |
Connections listed |
39 |
Check Interface in ss |
Run ss for lo:0 |
Connections listed |
40 |
Check Interface in route |
Run route command |
Route to lo:0 IP exists |
41 |
Check Interface in ip route |
Run ip route |
Route to lo:0 IP exists |
42 |
Check Interface in arp |
Run arp for lo:0 |
No ARP entry |
43 |
Check Interface in nmap |
Scan lo:0 IP |
Ports detected |
44 |
Check Interface in netcat |
Connect using netcat |
Connection successful |
45 |
Check Interface in curl |
Access service via curl |
Response received |
46 |
Check Interface in wget |
Download from lo:0 |
Download successful |
47 |
Check Interface in browser |
Open lo:0 IP in browser |
Page loads |
48 |
Check Interface in telnet |
Telnet to lo:0 |
Connection established |
49 |
Check Interface in ping6 |
Ping ::1 on lo:0 |
Reply received |
50 |
Check Interface in traceroute |
Traceroute to lo:0 IP |
Single hop |
Reserved Address Space - Testcases
S.No |
Test Case |
Description |
Expected Result |
|---|---|---|---|
1 |
Check Reserved Loopback Range |
Verify that 127.0.0.0/8 is reserved for loopback |
Range is reserved and not routable |
2 |
Ping Reserved Address 127.0.0.1 |
Send ICMP ping to 127.0.0.1 |
Ping successful |
3 |
Ping Reserved Address 127.255.255.255 |
Ping upper bound of loopback range |
Ping successful |
4 |
Access Reserved Address from Remote Host |
Try accessing 127.0.0.1 from another machine |
Access denied |
5 |
Bind Service to Reserved Address |
Bind a service to 127.0.0.5 |
Service binds successfully |
6 |
Check Routing Table for Reserved Range |
Inspect routing table for 127.0.0.0/8 |
Route exists to loopback |
7 |
Check ARP for Reserved Address |
Check ARP table for 127.0.0.1 |
No ARP entry exists |
8 |
Traceroute to Reserved Address |
Run traceroute to 127.0.0.1 |
Single hop (local) |
9 |
DNS Resolution to Reserved Address |
Resolve localhost |
Resolves to 127.0.0.1 |
10 |
Check Reserved Address in netstat |
Check services on 127.0.0.1 |
Services listed |
11 |
Check Reserved Address in ss |
Check connections to 127.0.0.1 |
Connections listed |
12 |
Check Reserved Address in ip addr |
List IPs on loopback interface |
127.0.0.1 present |
13 |
Check Reserved Address in ifconfig |
Use ifconfig to list loopback IPs |
127.0.0.1 present |
14 |
Check Reserved Address in ip route |
Inspect IP routing table |
Route to 127.0.0.0/8 exists |
15 |
Check Reserved Address in route |
Use route command |
Route to 127.0.0.0/8 exists |
16 |
Check Reserved Address in browser |
Open http://127.0.0.1 |
Local service loads |
17 |
Check Reserved Address in curl |
Use curl to access 127.0.0.1 |
Response received |
18 |
Check Reserved Address in wget |
Use wget to download from 127.0.0.1 |
Download successful |
19 |
Check Reserved Address in telnet |
Telnet to 127.0.0.1 |
Connection established |
20 |
Check Reserved Address in netcat |
Use netcat to connect |
Connection successful |
21 |
Check Reserved Address in nmap |
Scan 127.0.0.1 |
Ports detected |
22 |
Check Reserved Address in firewall |
Inspect firewall rules |
Traffic allowed |
23 |
Check Reserved Address in tcpdump |
Capture packets to 127.0.0.1 |
Packets visible |
24 |
Check Reserved Address in Wireshark |
Capture loopback traffic |
Packets visible |
25 |
Check Reserved Address in logs |
Inspect logs for 127.0.0.1 |
Entries found |
26 |
Check Reserved Address in hosts file |
Verify localhost entry |
127.0.0.1 localhost |
27 |
Check Reserved Address in /etc/hosts |
Inspect Linux hosts file |
Entry exists |
28 |
Check Reserved Address in Windows hosts |
Inspect Windows hosts file |
Entry exists |
29 |
Check Reserved Address in IPv6 |
Ensure 127.0.0.1 not used in IPv6 |
Not applicable |
30 |
Check Reserved Address in IPv4-only mode |
Use 127.0.0.1 in IPv4-only mode |
Works correctly |
31 |
Check Reserved Address in Docker |
Bind container to 127.0.0.1 |
Accessible locally |
32 |
Check Reserved Address in Kubernetes |
Bind pod to 127.0.0.1 |
Accessible within node |
33 |
Check Reserved Address in VirtualBox |
Use 127.0.0.1 in VM |
Accessible inside VM |
34 |
Check Reserved Address in WSL |
Access 127.0.0.1 from WSL |
Accesses Windows host |
35 |
Check Reserved Address in VPN |
Access 127.0.0.1 with VPN |
Accesses local machine |
36 |
Check Reserved Address in Proxy |
Use 127.0.0.1 as proxy |
Proxy works locally |
37 |
Check Reserved Address in SSH Tunnel |
Forward port to 127.0.0.1 |
Tunnel works locally |
38 |
Check Reserved Address in Port Forwarding |
Forward port to 127.0.0.1 |
Forwarding works locally |
39 |
Check Reserved Address in NAT |
Use 127.0.0.1 in NAT |
Not routable |
40 |
Check Reserved Address in SNAT |
Use 127.0.0.1 as source IP |
Invalid configuration |
41 |
Check Reserved Address in DNAT |
Use 127.0.0.1 as destination IP |
Invalid configuration |
42 |
Check Reserved Address in iptables |
Create rule for 127.0.0.1 |
Rule applied |
43 |
Check Reserved Address in nftables |
Create rule for 127.0.0.1 |
Rule applied |
44 |
Check Reserved Address in systemd |
Bind service to 127.0.0.1 |
Service starts |
45 |
Check Reserved Address in nginx |
Bind nginx to 127.0.0.1 |
Server runs locally |
46 |
Check Reserved Address in Apache |
Bind Apache to 127.0.0.1 |
Server runs locally |
47 |
Check Reserved Address in MySQL |
Bind MySQL to 127.0.0.1 |
Accessible locally |
48 |
Check Reserved Address in PostgreSQL |
Bind PostgreSQL to 127.0.0.1 |
Accessible locally |
49 |
Check Reserved Address in Redis |
Bind Redis to 127.0.0.1 |
Accessible locally |
50 |
Check Reserved Address in MongoDB |
Bind MongoDB to 127.0.0.1 |
Accessible locally |
No External Routing - Testcases
S.No |
Test Case |
Description |
Expected Result |
|---|---|---|---|
1 |
Ping Loopback from External Host |
Attempt to ping 127.0.0.1 from another machine |
Ping fails |
2 |
Traceroute to Loopback |
Run traceroute to 127.0.0.1 externally |
No route exists |
3 |
Access Loopback Web Server Externally |
Try accessing web server on 127.0.0.1 |
Connection fails |
4 |
External SSH to Loopback |
SSH to 127.0.0.1 from remote |
Connection refused |
5 |
External Telnet to Loopback |
Telnet to 127.0.0.1 from another host |
Connection fails |
6 |
External Port Scan on Loopback |
Run nmap on 127.0.0.1 remotely |
No ports detected |
7 |
External DNS Resolution to Loopback |
Resolve 127.0.0.1 externally |
Not routable |
8 |
External Route to Loopback |
Check routing table for 127.0.0.1 |
No route exists |
9 |
External NAT to Loopback |
NAT forward to 127.0.0.1 |
Fails |
10 |
External VPN to Loopback |
Access 127.0.0.1 over VPN |
Fails |
11 |
External Proxy to Loopback |
Proxy forward to 127.0.0.1 |
Fails |
12 |
External SNAT to Loopback |
Use 127.0.0.1 as SNAT source |
Invalid |
13 |
External DNAT to Loopback |
Use 127.0.0.1 as DNAT destination |
Invalid |
14 |
External ICMP to Loopback |
Send ICMP echo to 127.0.0.1 |
No reply |
15 |
External UDP to Loopback |
Send UDP to 127.0.0.1 |
Packet dropped |
16 |
External TCP to Loopback |
TCP connect to 127.0.0.1 |
Connection refused |
17 |
External ARP for Loopback |
ARP for 127.0.0.1 |
No entry |
18 |
External Routing Protocols |
Advertise 127.0.0.1 in OSPF/BGP |
Ignored |
19 |
External Firewall Rule |
Create rule for 127.0.0.1 |
Ineffective |
20 |
External Packet Capture |
Capture packets to 127.0.0.1 |
No packets seen |
21 |
External DNS PTR |
Reverse DNS for 127.0.0.1 |
Fails or localhost |
22 |
External SNMP |
Query SNMP on 127.0.0.1 |
No response |
23 |
External FTP |
Connect to FTP on 127.0.0.1 |
Fails |
24 |
External HTTP |
Access HTTP on 127.0.0.1 |
Fails |
25 |
External SMTP |
Send mail to 127.0.0.1 |
Fails |
26 |
External Syslog |
Send syslog to 127.0.0.1 |
Not received |
27 |
External DHCP |
Send DHCP to 127.0.0.1 |
No response |
28 |
External TFTP |
Access TFTP on 127.0.0.1 |
Fails |
29 |
External RDP |
Connect to RDP on 127.0.0.1 |
Fails |
30 |
External SMB |
Access SMB on 127.0.0.1 |
Fails |
31 |
External VPN Tunnel |
Tunnel VPN to 127.0.0.1 |
Fails |
32 |
External DNS Zone Transfer |
AXFR to 127.0.0.1 |
Fails |
33 |
External NTP |
Query NTP on 127.0.0.1 |
Fails |
34 |
External LDAP |
Connect to LDAP on 127.0.0.1 |
Fails |
35 |
External MQTT |
Connect to MQTT on 127.0.0.1 |
Fails |
36 |
External WebSocket |
Connect WebSocket to 127.0.0.1 |
Fails |
37 |
External REST API |
Call REST API on 127.0.0.1 |
Fails |
38 |
External gRPC |
Connect gRPC to 127.0.0.1 |
Fails |
39 |
External SSH Tunnel |
Tunnel SSH to 127.0.0.1 |
Fails |
40 |
External Port Forwarding |
Forward port to 127.0.0.1 |
Fails |
41 |
External Load Balancer |
Route traffic to 127.0.0.1 |
Fails |
42 |
External CDN |
Use CDN to reach 127.0.0.1 |
Fails |
43 |
External Cloud Function |
Invoke function to 127.0.0.1 |
Fails |
44 |
External Container |
Access 127.0.0.1 from container |
Accesses container’s own loopback |
45 |
External VM |
Access 127.0.0.1 from VM |
Accesses VM’s own loopback |
46 |
Host to Loopback in Docker |
Access 127.0.0.1 from host to container |
Fails |
47 |
Host to Loopback in WSL |
Access 127.0.0.1 from host to WSL |
Fails |
48 |
Host to Loopback in Hyper-V |
Access 127.0.0.1 from host to VM |
Fails |
49 |
Host to Loopback in KVM |
Access 127.0.0.1 from host to VM |
Fails |
50 |
Host to Loopback in VMware |
Access 127.0.0.1 from host to VM |
Fails |
Protocol Testing - Testcases
S.No |
Test Case |
Description |
Expected Result |
|---|---|---|---|
1 |
ICMP Echo Request |
Send ping to 127.0.0.1 |
Echo reply received |
2 |
TCP Connection |
Establish TCP connection to 127.0.0.1 |
Connection successful |
3 |
UDP Packet |
Send UDP packet to 127.0.0.1 |
Packet received locally |
4 |
HTTP Request |
Access local web server on 127.0.0.1 |
HTTP response received |
5 |
HTTPS Request |
Access HTTPS service on 127.0.0.1 |
Secure connection established |
6 |
FTP Connection |
Connect to FTP server on 127.0.0.1 |
Login prompt received |
7 |
SSH Connection |
Connect to SSH server on 127.0.0.1 |
SSH session established |
8 |
Telnet Session |
Start Telnet session to 127.0.0.1 |
Session starts |
9 |
SMTP Test |
Send email via SMTP on 127.0.0.1 |
Email accepted |
10 |
DNS Query |
Query DNS server on 127.0.0.1 |
DNS response received |
11 |
DHCP Request |
Send DHCP request to 127.0.0.1 |
No response (not supported) |
12 |
SNMP Query |
Query SNMP agent on 127.0.0.1 |
SNMP response received |
13 |
NTP Sync |
Sync time with NTP server on 127.0.0.1 |
Time synchronized |
14 |
LDAP Bind |
Bind to LDAP server on 127.0.0.1 |
Bind successful |
15 |
RDP Session |
Connect to RDP on 127.0.0.1 |
Session established |
16 |
SMB Access |
Access SMB share on 127.0.0.1 |
Share accessible |
17 |
TFTP Transfer |
Transfer file via TFTP on 127.0.0.1 |
File transferred |
18 |
MQTT Publish |
Publish message to MQTT broker on 127.0.0.1 |
Message received |
19 |
WebSocket Connect |
Connect to WebSocket server on 127.0.0.1 |
Connection established |
20 |
REST API Call |
Call REST API on 127.0.0.1 |
JSON response received |
21 |
gRPC Call |
Make gRPC call to 127.0.0.1 |
Response received |
22 |
ICMPv6 Echo |
Ping ::1 (IPv6 loopback) |
Echo reply received |
23 |
TCPv6 Connection |
Connect to ::1 via TCP |
Connection successful |
24 |
UDPv6 Packet |
Send UDP packet to ::1 |
Packet received |
25 |
HTTPv6 Request |
Access web server on ::1 |
Response received |
26 |
DNSv6 Query |
Query DNS on ::1 |
Response received |
27 |
FTPv6 Connection |
Connect to FTP on ::1 |
Login prompt received |
28 |
SSHv6 Connection |
SSH to ::1 |
Session established |
29 |
SMTPv6 Test |
Send email via SMTP on ::1 |
Email accepted |
30 |
SNMPv6 Query |
Query SNMP on ::1 |
Response received |
31 |
NTPv6 Sync |
Sync time with NTP on ::1 |
Time synchronized |
32 |
LDAPv6 Bind |
Bind to LDAP on ::1 |
Bind successful |
33 |
RDPv6 Session |
Connect to RDP on ::1 |
Session established |
34 |
SMBv6 Access |
Access SMB on ::1 |
Share accessible |
35 |
TFTPv6 Transfer |
Transfer file via TFTP on ::1 |
File transferred |
36 |
MQTTv6 Publish |
Publish to MQTT on ::1 |
Message received |
37 |
WebSocketv6 Connect |
Connect WebSocket to ::1 |
Connection established |
38 |
RESTv6 API Call |
Call REST API on ::1 |
JSON response received |
39 |
gRPCv6 Call |
Make gRPC call to ::1 |
Response received |
40 |
ICMP Error Handling |
Send malformed ICMP to 127.0.0.1 |
Error handled gracefully |
41 |
TCP Retransmission |
Simulate packet loss on TCP |
Retransmission occurs |
42 |
UDP Loss Simulation |
Drop UDP packet |
No retransmission |
43 |
HTTP Timeout |
Delay HTTP response |
Client times out |
44 |
DNS Cache Test |
Query same DNS repeatedly |
Cached response |
45 |
FTP Passive Mode |
Use passive FTP on 127.0.0.1 |
Connection successful |
46 |
SSH Key Exchange |
Initiate SSH key exchange |
Keys exchanged |
47 |
SMTP Authentication |
Authenticate SMTP user |
Auth successful |
48 |
DNS Zone Transfer |
Attempt AXFR on 127.0.0.1 |
Transfer allowed/denied |
49 |
SNMP Trap |
Send SNMP trap to 127.0.0.1 |
Trap received |
50 |
NTP Drift Test |
Simulate time drift |
Correction applied |
Service Isolation - Testcases
S.No |
Test Case |
Description |
Expected Result |
|---|---|---|---|
1 |
Isolate Web Server |
Bind web server to 127.0.0.1 |
Not accessible externally |
2 |
Isolate SSH |
Bind SSH to 127.0.0.1 |
Remote SSH fails |
3 |
Isolate MySQL |
Bind MySQL to 127.0.0.1 |
External DB access fails |
4 |
Isolate PostgreSQL |
Bind PostgreSQL to 127.0.0.1 |
Remote access denied |
5 |
Isolate Redis |
Bind Redis to 127.0.0.1 |
External clients blocked |
6 |
Isolate MongoDB |
Bind MongoDB to 127.0.0.1 |
No external access |
7 |
Isolate FTP |
Bind FTP to 127.0.0.1 |
Remote FTP fails |
8 |
Isolate SMTP |
Bind SMTP to 127.0.0.1 |
External mail fails |
9 |
Isolate DNS |
Bind DNS to 127.0.0.1 |
External resolution fails |
10 |
Isolate NTP |
Bind NTP to 127.0.0.1 |
Remote sync fails |
11 |
Isolate SNMP |
Bind SNMP to 127.0.0.1 |
External queries fail |
12 |
Isolate WebSocket |
Bind WebSocket to 127.0.0.1 |
Remote connection fails |
13 |
Isolate gRPC |
Bind gRPC to 127.0.0.1 |
External call fails |
14 |
Isolate MQTT |
Bind MQTT to 127.0.0.1 |
Remote broker access fails |
15 |
Isolate LDAP |
Bind LDAP to 127.0.0.1 |
External bind fails |
16 |
Isolate REST API |
Bind API to 127.0.0.1 |
Remote access fails |
17 |
Isolate Admin Panel |
Bind admin UI to 127.0.0.1 |
Not accessible externally |
18 |
Isolate Monitoring Agent |
Bind agent to 127.0.0.1 |
No external metrics |
19 |
Isolate Logging Service |
Bind logger to 127.0.0.1 |
Logs not externally visible |
20 |
Isolate Proxy |
Bind proxy to 127.0.0.1 |
External use blocked |
21 |
Isolate Docker API |
Bind Docker API to 127.0.0.1 |
Remote access fails |
22 |
Isolate Kubernetes API |
Bind K8s API to 127.0.0.1 |
External access denied |
23 |
Isolate Jenkins |
Bind Jenkins to 127.0.0.1 |
Not accessible remotely |
24 |
Isolate Git Server |
Bind Git to 127.0.0.1 |
Remote push/pull fails |
25 |
Isolate CI/CD Agent |
Bind agent to 127.0.0.1 |
No external control |
26 |
Isolate Backup Service |
Bind backup to 127.0.0.1 |
Remote backup fails |
27 |
Isolate Chat Server |
Bind chat to 127.0.0.1 |
Remote users blocked |
28 |
Isolate Game Server |
Bind game server to 127.0.0.1 |
No external players |
29 |
Isolate File Server |
Bind file server to 127.0.0.1 |
Remote file access fails |
30 |
Isolate Print Server |
Bind print service to 127.0.0.1 |
Remote printing fails |
31 |
Isolate Time Sync |
Bind time sync to 127.0.0.1 |
External sync fails |
32 |
Isolate Metrics Exporter |
Bind exporter to 127.0.0.1 |
No external metrics |
33 |
Isolate Alert Manager |
Bind alert manager to 127.0.0.1 |
No external alerts |
34 |
Isolate Cache Server |
Bind cache to 127.0.0.1 |
Remote access fails |
35 |
Isolate API Gateway |
Bind gateway to 127.0.0.1 |
No external routing |
36 |
Isolate Load Balancer |
Bind LB to 127.0.0.1 |
No external balancing |
37 |
Isolate Reverse Proxy |
Bind reverse proxy to 127.0.0.1 |
No external proxying |
38 |
Isolate Webhook Listener |
Bind listener to 127.0.0.1 |
External webhooks fail |
39 |
Isolate Notification Service |
Bind notifier to 127.0.0.1 |
No external notifications |
40 |
Isolate Email Relay |
Bind relay to 127.0.0.1 |
External mail fails |
41 |
Isolate Chatbot |
Bind chatbot to 127.0.0.1 |
No external interaction |
42 |
Isolate AI Model Server |
Bind model server to 127.0.0.1 |
No external inference |
43 |
Isolate Dev Server |
Bind dev server to 127.0.0.1 |
Only local access |
44 |
Isolate Test Harness |
Bind test harness to 127.0.0.1 |
No remote execution |
45 |
Isolate Build Server |
Bind build server to 127.0.0.1 |
No remote builds |
46 |
Isolate Package Repo |
Bind repo to 127.0.0.1 |
No external access |
47 |
Isolate Container Registry |
Bind registry to 127.0.0.1 |
No external pulls |
48 |
Isolate License Server |
Bind license server to 127.0.0.1 |
No external validation |
49 |
Isolate Auth Server |
Bind auth server to 127.0.0.1 |
No external authentication |
50 |
Isolate Config Server |
Bind config server to 127.0.0.1 |
No external config access |
IPV4 and IPV6 - Testcases
S.No |
Test Case |
Description |
Expected Result |
|---|---|---|---|
1 |
IPv4 Ping |
Ping 127.0.0.1 |
Reply received |
2 |
IPv6 Ping |
Ping ::1 |
Reply received |
3 |
IPv4 TCP |
TCP connection to 127.0.0.1 |
Connection successful |
4 |
IPv6 TCP |
TCP connection to ::1 |
Connection successful |
5 |
IPv4 UDP |
Send UDP to 127.0.0.1 |
Packet received |
6 |
IPv6 UDP |
Send UDP to ::1 |
Packet received |
7 |
IPv4 ICMP |
ICMP echo to 127.0.0.1 |
Echo reply received |
8 |
IPv6 ICMP |
ICMP echo to ::1 |
Echo reply received |
9 |
IPv4 DNS |
Resolve localhost to IPv4 |
127.0.0.1 |
10 |
IPv6 DNS |
Resolve localhost to IPv6 |
::1 |
11 |
IPv4 Bind |
Bind service to 127.0.0.1 |
Success |
12 |
IPv6 Bind |
Bind service to ::1 |
Success |
13 |
IPv4 Listen |
Listen on 127.0.0.1 |
Port open |
14 |
IPv6 Listen |
Listen on ::1 |
Port open |
15 |
IPv4 Capture |
Capture packets to 127.0.0.1 |
Packets visible |
16 |
IPv6 Capture |
Capture packets to ::1 |
Packets visible |
17 |
IPv4 Interface |
Check loopback for IPv4 |
127.0.0.1 assigned |
18 |
IPv6 Interface |
Check loopback for IPv6 |
::1 assigned |
19 |
IPv4 Route |
Check route to 127.0.0.0/8 |
Route exists |
20 |
IPv6 Route |
Check route to ::1 |
Route exists |
21 |
IPv4 Traceroute |
Traceroute to 127.0.0.1 |
Single hop |
22 |
IPv6 Traceroute |
Traceroute to ::1 |
Single hop |
23 |
IPv4 Firewall |
Apply rule to 127.0.0.1 |
Rule enforced |
24 |
IPv6 Firewall |
Apply rule to ::1 |
Rule enforced |
25 |
IPv4 Isolation |
Bind service to 127.0.0.1 |
Not externally accessible |
26 |
IPv6 Isolation |
Bind service to ::1 |
Not externally accessible |
27 |
IPv4 NAT |
NAT with 127.0.0.1 |
Fails |
28 |
IPv6 NAT |
NAT with ::1 |
Fails |
29 |
IPv4 External |
Access 127.0.0.1 remotely |
Denied |
30 |
IPv6 External |
Access ::1 remotely |
Denied |
31 |
IPv4 Web Server |
Run web server on 127.0.0.1 |
Accessible locally |
32 |
IPv6 Web Server |
Run web server on ::1 |
Accessible locally |
33 |
IPv4 SSH |
SSH on 127.0.0.1 |
Local access only |
34 |
IPv6 SSH |
SSH on ::1 |
Local access only |
35 |
IPv4 DNS Server |
DNS on 127.0.0.1 |
Resolves locally |
36 |
IPv6 DNS Server |
DNS on ::1 |
Resolves locally |
37 |
IPv4 SNMP |
SNMP on 127.0.0.1 |
Local access |
38 |
IPv6 SNMP |
SNMP on ::1 |
Local access |
39 |
IPv4 SMTP |
SMTP on 127.0.0.1 |
Local mail only |
40 |
IPv6 SMTP |
SMTP on ::1 |
Local mail only |
41 |
IPv4 FTP |
FTP on 127.0.0.1 |
Local access |
42 |
IPv6 FTP |
FTP on ::1 |
Local access |
43 |
IPv4 Browser |
Open 127.0.0.1 in browser |
Page loads |
44 |
IPv6 Browser |
Open [::1] in browser |
Page loads |
45 |
IPv4 Logging |
Log access to 127.0.0.1 |
Entry created |
46 |
IPv6 Logging |
Log access to ::1 |
Entry created |
47 |
IPv4 Monitoring |
Monitor 127.0.0.1 traffic |
Visible |
48 |
IPv6 Monitoring |
Monitor ::1 traffic |
Visible |
49 |
IPv4 Alias |
Create alias 127.0.0.2 |
Works |
50 |
IPv6 Alias |
Create alias ::2 |
Works |
Application Development - Testcases
S.No |
Test Case |
Description |
Expected Result |
|---|---|---|---|
1 |
Ping Loopback |
Ping 127.0.0.1 |
Reply received successfully |
2 |
Ping IPv6 Loopback |
Ping ::1 |
Reply received successfully |
3 |
DNS Resolution |
Resolve localhost |
Resolves to 127.0.0.1 |
4 |
TCP Connection |
Connect to TCP server on 127.0.0.1 |
Connection established |
5 |
UDP Communication |
Send/receive UDP packets on loopback |
Packets received correctly |
6 |
HTTP Server |
Start HTTP server on 127.0.0.1 |
Server accessible locally |
7 |
Port Binding |
Bind to port on loopback |
Port binds successfully |
8 |
Port Conflict |
Bind same port twice on loopback |
Second bind fails |
9 |
Firewall Rules |
Block loopback traffic |
Traffic blocked |
10 |
Loopback Isolation |
Access loopback from another machine |
Access denied |
11 |
Loopback Latency |
Measure latency to 127.0.0.1 |
Near-zero latency |
12 |
Loopback Throughput |
Test data transfer speed |
High throughput |
13 |
Loopback Interface Down |
Disable loopback interface |
No traffic allowed |
14 |
Loopback Interface Up |
Enable loopback interface |
Traffic allowed |
15 |
Loopback with Proxy |
Use proxy on 127.0.0.1 |
Proxy functions correctly |
16 |
Loopback with VPN |
Use VPN and test loopback |
Loopback unaffected |
17 |
Loopback with Docker |
Access container service via 127.0.0.1 |
Access fails (use host IP) |
18 |
Loopback with Hostname |
Access localhost:port |
Service reachable |
19 |
Loopback with IPv6 |
Start service on ::1 |
Accessible via IPv6 |
20 |
Loopback with SSL |
HTTPS server on 127.0.0.1 |
SSL handshake successful |
21 |
Loopback with Authentication |
Auth service on loopback |
Auth works |
22 |
Loopback with Load Testing |
Simulate load on loopback server |
Server handles load |
23 |
Loopback with Logging |
Log loopback traffic |
Logs generated |
24 |
Loopback with Firewall Logging |
Log blocked loopback traffic |
Logs show blocked attempts |
25 |
Loopback with Port Scan |
Scan ports on 127.0.0.1 |
Open ports detected |
26 |
Loopback with Malware |
Malware tries to use loopback |
Detected and blocked |
27 |
Loopback with Antivirus |
Antivirus scans loopback traffic |
No threats found |
28 |
Loopback with Rate Limiting |
Apply rate limit on loopback |
Limit enforced |
29 |
Loopback with NAT |
Test NAT behavior with loopback |
NAT not applied |
30 |
Loopback with DNS Spoofing |
Spoof localhost DNS |
Spoofing fails |
31 |
Loopback with Host File |
Modify /etc/hosts for localhost |
Custom resolution works |
32 |
Loopback with IPv4/IPv6 Dual Stack |
Bind service to both 127.0.0.1 and ::1 |
Both accessible |
33 |
Loopback with ICMP Block |
Block ICMP on loopback |
Ping fails |
34 |
Loopback with ICMP Allow |
Allow ICMP on loopback |
Ping succeeds |
35 |
Loopback with WebSocket |
WebSocket server on loopback |
Connection successful |
36 |
Loopback with gRPC |
gRPC server on loopback |
RPC calls succeed |
37 |
Loopback with REST API |
REST API on loopback |
API responds |
38 |
Loopback with Database |
DB server on loopback |
DB accessible |
39 |
Loopback with SSH |
SSH server on loopback |
SSH connection succeeds |
40 |
Loopback with FTP |
FTP server on loopback |
FTP connection succeeds |
41 |
Loopback with SMTP |
SMTP server on loopback |
Email sent locally |
42 |
Loopback with Syslog |
Syslog server on loopback |
Logs received |
43 |
Loopback with SNMP |
SNMP agent on loopback |
SNMP queries succeed |
44 |
Loopback with Monitoring Tools |
Monitor loopback traffic |
Traffic visible |
45 |
Loopback with Packet Capture |
Capture packets on loopback |
Packets captured |
46 |
Loopback with QoS |
Apply QoS on loopback |
QoS rules applied |
47 |
Loopback with IDS/IPS |
Detect loopback anomalies |
Alerts generated |
48 |
Loopback with Container Networking |
Access container via loopback |
Not accessible (expected) |
49 |
Loopback with Host Networking |
Container with host network uses loopback |
Access successful |
50 |
Loopback with System Boot |
Loopback interface after reboot |
Interface up and working |
Performance Benchmarking - Testcases
S.No |
Test Case |
Description |
Expected Result |
|---|---|---|---|
1 |
Basic Ping |
Ping 127.0.0.1 |
Response < 1ms |
2 |
ICMP Flood |
Send 1000 ICMP packets/sec |
No packet loss |
3 |
TCP Echo |
TCP echo server on loopback |
Echo within 1ms |
4 |
UDP Echo |
UDP echo server on loopback |
Echo within 1ms |
5 |
Max Packet Size |
Send 65,535-byte packet |
No fragmentation |
6 |
Min Packet Size |
Send 1-byte packet |
Delivered successfully |
7 |
Concurrent TCP |
100 concurrent TCP connections |
All succeed |
8 |
Concurrent UDP |
100 concurrent UDP streams |
All succeed |
9 |
High Throughput |
Send 1Gbps data |
No loss, low latency |
10 |
Low Throughput |
Send 1Kbps data |
Stable connection |
11 |
Packet Loss |
Simulate 10% loss |
Loopback unaffected |
12 |
Latency Spike |
Inject 100ms delay |
Loopback unaffected |
13 |
CPU Load |
High CPU usage during test |
Loopback stable |
14 |
Memory Load |
High memory usage |
Loopback stable |
15 |
Loopback Isolation |
Disable NICs |
Loopback still works |
16 |
Port Scan |
Scan 1-65535 on 127.0.0.1 |
No crash or hang |
17 |
DNS Resolution |
Resolve localhost |
Resolves to 127.0.0.1 |
18 |
IPv6 Loopback |
Ping ::1 |
Response < 1ms |
19 |
Mixed Protocols |
TCP + UDP + ICMP |
All succeed |
20 |
Socket Reuse |
Reuse socket on loopback |
No errors |
21 |
Firewall Enabled |
Enable firewall |
Loopback unaffected |
22 |
Loopback Routing |
Route to 127.0.0.1 |
No external routing |
23 |
Packet Sniffing |
Monitor loopback |
Packets visible |
24 |
MTU Check |
Send MTU-sized packets |
No fragmentation |
25 |
Loopback Drop |
Drop loopback packets |
No external impact |
26 |
Loopback Delay |
Inject artificial delay |
Delay observed |
27 |
Loopback Jitter |
Vary delay |
Jitter measurable |
28 |
Loopback Bandwidth |
Measure bandwidth |
Near max system limit |
29 |
Loopback Errors |
Inject checksum errors |
Detected and dropped |
30 |
Loopback Reset |
Reset interface |
Reconnects instantly |
31 |
Loopback Reboot |
Reboot system |
Loopback restored |
32 |
Loopback Load Test |
10,000 requests/sec |
No crash |
33 |
Loopback Stress Test |
1M packets in 1 min |
No packet loss |
34 |
Loopback Port Binding |
Bind multiple ports |
All bind successfully |
35 |
Loopback Port Conflict |
Bind same port twice |
Error on second bind |
36 |
Loopback Socket Timeout |
Set timeout = 1s |
Timeout enforced |
37 |
Loopback Socket Blocking |
Test blocking mode |
Works as expected |
38 |
Loopback Socket Non-blocking |
Test non-blocking mode |
Works as expected |
39 |
Loopback Interface Down |
Bring down interface |
Loopback fails |
40 |
Loopback Interface Up |
Bring up interface |
Loopback restored |
41 |
Loopback with VPN |
Enable VPN |
Loopback unaffected |
42 |
Loopback with Proxy |
Use proxy on loopback |
Works correctly |
43 |
Loopback with Docker |
Container to 127.0.0.1 |
Isolated from host |
44 |
Loopback with VM |
VM to 127.0.0.1 |
Isolated from host |
45 |
Loopback with IPv4/IPv6 Dual Stack |
Test both |
Both respond |
46 |
Loopback with QoS |
Apply QoS rules |
No effect on loopback |
47 |
Loopback with NAT |
Apply NAT rules |
No effect |
48 |
Loopback with IDS/IPS |
Enable IDS |
No alerts triggered |
49 |
Loopback with Logging |
Enable logging |
All packets logged |
50 |
Loopback Security Scan |
Run vulnerability scan |
No vulnerabilities |
System Health Monitoring - Testcases
S.No |
Test Case |
Description |
Expected Result |
|---|---|---|---|
1 |
Loopback Ping |
Ping 127.0.0.1 |
Response < 1ms |
2 |
Loopback Interface Status |
Check if loopback is up |
Status = UP |
3 |
Loopback IP Address |
Verify IP is 127.0.0.1 |
Correct IP assigned |
4 |
Loopback Packet Count |
Monitor packet count |
Increases with traffic |
5 |
Loopback Error Count |
Check for errors |
Error count = 0 |
6 |
Loopback Interface Load |
Monitor traffic load |
Within normal range |
7 |
Loopback Latency |
Measure latency |
< 1ms |
8 |
Loopback Throughput |
Measure throughput |
Matches expected |
9 |
Loopback Packet Drop |
Check for dropped packets |
0 drops |
10 |
Loopback Interface Restart |
Restart loopback |
Comes back online |
11 |
Loopback Interface Disable |
Disable loopback |
Interface goes down |
12 |
Loopback Interface Enable |
Enable loopback |
Interface comes up |
13 |
Loopback Interface Reboot |
Reboot system |
Loopback restored |
14 |
Loopback Interface Logs |
Check system logs |
No critical errors |
15 |
Loopback Interface MTU |
Verify MTU size |
Default = 65536 |
16 |
Loopback Interface Binding |
Bind service to 127.0.0.1 |
Service accessible |
17 |
Loopback Interface Isolation |
Isolate from external |
No external access |
18 |
Loopback Interface Security |
Scan for vulnerabilities |
No issues found |
19 |
Loopback Interface Monitoring Tool |
Use monitoring tool |
Loopback visible |
20 |
Loopback Interface SNMP |
Query via SNMP |
Data available |
21 |
Loopback Interface CPU Usage |
Monitor CPU during traffic |
Within limits |
22 |
Loopback Interface Memory Usage |
Monitor memory usage |
Within limits |
23 |
Loopback Interface Port Scan |
Scan ports on 127.0.0.1 |
No crash |
24 |
Loopback Interface ICMP Monitoring |
Monitor ICMP traffic |
Detected correctly |
25 |
Loopback Interface TCP Monitoring |
Monitor TCP traffic |
Detected correctly |
26 |
Loopback Interface UDP Monitoring |
Monitor UDP traffic |
Detected correctly |
27 |
Loopback Interface Service Health |
Check local services |
All reachable |
28 |
Loopback Interface DNS Resolution |
Resolve localhost |
Resolves to 127.0.0.1 |
29 |
Loopback Interface IPv6 |
Check ::1 |
Responds correctly |
30 |
Loopback Interface Dual Stack |
IPv4 + IPv6 |
Both functional |
31 |
Loopback Interface Firewall Rules |
Apply rules |
Loopback unaffected |
32 |
Loopback Interface Logging Enabled |
Enable logging |
Logs generated |
33 |
Loopback Interface Packet Sniffing |
Capture packets |
Packets visible |
34 |
Loopback Interface Interface ID |
Check interface ID |
lo or equivalent |
35 |
Loopback Interface Interface Type |
Verify type |
Loopback |
36 |
Loopback Interface Interface Speed |
Check speed |
Not applicable |
37 |
Loopback Interface Interface Errors |
Check for CRC errors |
None |
38 |
Loopback Interface Interface Collisions |
Check for collisions |
None |
39 |
Loopback Interface Interface Counters |
Monitor counters |
Accurate |
40 |
Loopback Interface Interface Uptime |
Check uptime |
Matches system uptime |
41 |
Loopback Interface Interface Reset |
Reset interface |
Recovers successfully |
42 |
Loopback Interface Interface Alias |
Add alias |
Alias works |
43 |
Loopback Interface Interface Traffic Graph |
Generate graph |
Data plotted |
44 |
Loopback Interface Interface Alerts |
Set alert threshold |
Alerts triggered |
45 |
Loopback Interface Interface Health Dashboard |
View dashboard |
Loopback shown |
46 |
Loopback Interface Interface Monitoring Interval |
Set interval |
Data updates correctly |
47 |
Loopback Interface Interface Monitoring Agent |
Use agent |
Reports loopback status |
48 |
Loopback Interface Interface Monitoring API |
Query via API |
Returns loopback data |
49 |
Loopback Interface Interface Monitoring CLI |
Use CLI tool |
Loopback info shown |
50 |
Loopback Interface Interface Monitoring with Load |
Simulate load |
Loopback remains stable |
Reference links