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azlin ip (IP Diagnostics)

Troubleshoot IP connectivity issues and diagnose network problems across azlin VMs.

Description

The azlin ip command provides comprehensive IP diagnostics including connectivity tests, DNS resolution checks, firewall rule verification, and network path analysis.

Usage

azlin ip [COMMAND] [OPTIONS]

Commands

Command Description
check Check VM IP connectivity
diagnose Run comprehensive diagnostics
test Test connectivity to specific IP
trace Trace network path

Examples

Check VM IP Status

azlin ip check my-vm

Output: 

IP Diagnostics for 'my-vm':

VM Status: Running
Public IP: 20.12.34.56
Private IP: 10.0.1.5
Region: eastus

Connectivity Tests:
✓ VM is reachable
✓ SSH port (22) is open
✓ DNS resolution working
✓ Internet connectivity confirmed

Network Configuration:
  VNet: azlin-vnet
  Subnet: default
  NSG: azlin-vm-001-nsg

No issues detected.

Run Full Diagnostics

azlin ip diagnose my-vm

Output includes: - VM network configuration - Public/private IP status - SSH connectivity test - DNS resolution check - Firewall rules - Network security group (NSG) rules - Route table analysis - Internet connectivity test

Test Specific Connectivity

# Test if VM can reach external service
azlin ip test my-vm --target 8.8.8.8
azlin ip test my-vm --target github.com

Trace Network Path

# Trace route to external destination
azlin ip trace my-vm --target google.com

Output: 

Tracing route from my-vm (20.12.34.56) to google.com:

Hop 1: 10.0.1.1 (0.8 ms) - Gateway
Hop 2: 172.16.0.1 (2.3 ms) - Azure backbone
Hop 3: 142.250.185.78 (15.4 ms) - google.com

Route is healthy.

Common Workflows

Cannot Connect to VM

# Step 1: Check basic connectivity
azlin ip check my-vm

# Step 2: If issues found, run full diagnostics
azlin ip diagnose my-vm

# Step 3: Common fixes shown:
# - Start VM if stopped
# - Check NSG rules
# - Verify firewall settings

Debug Application Connectivity

# Check if VM can reach database
azlin ip test my-vm --target db-server.azure.com --port 5432

# Check outbound internet
azlin ip test my-vm --target api.github.com --port 443

Network Security Audit

# Check all VMs
for vm in $(azlin list --format json | jq -r '.[].name'); do
  azlin ip diagnose $vm >> /tmp/network-audit.txt
done

Troubleshooting Scenarios

SSH Connection Refused

Problem: Cannot SSH to VM.

Diagnosis: 

azlin ip check my-vm

Common causes: - VM is stopped - NSG blocks port 22 - Public IP not assigned - Firewall rules blocking SSH

VM Cannot Reach Internet

Problem: VM has no outbound connectivity.

Diagnosis: 

azlin ip test my-vm --target 8.8.8.8
azlin ip diagnose my-vm

Common causes: - NSG outbound rules blocking traffic - Route table misconfiguration - DNS resolution failure

Slow Network Performance

Diagnosis: 

azlin ip trace my-vm --target target-server.com

Look for: - High latency hops - Packet loss - Routing issues

See Also