Task 02: Test Connectivity

Objective: Verify network connectivity for VPN, Bastion, and DNS resolution

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VPN Connectivity Tests

1. Check VPN Connection Status

Azure Portal Method:

1. Navigate to Virtual network gateways
2. Select the VPN Gateway
3. Click Connections
4. Verify connection shows Connected

Azure CLI Method:

az network vpn-connection show \
 --name conn-{cid}-cluster-{instance} \
 --resource-group rg-{cid}-{env}-{region}-management \
 --query connectionStatus

Expected: "Connected"

2. Verify BGP Peering

Azure Portal:

1. Virtual network gateways → VPN Gateway
2. Select BGP peers
3. Verify:

• On-premises BGP peer shows Connected
• Routes are being learned
• Peer IP matches on-prem configuration

Azure CLI:

az network vnet-gateway list-bgp-peer-status \
 --name vpngw-{cid}-{env}-{region} \
 --resource-group rg-{cid}-{env}-{region}-management

Expected output shows peer with "connectedDuration" value.

3. Test Connectivity to On-Premises

If VPN connection is established and you have access to on-premises:

# From Azure VM or Cloud Shell
ping 10.0.0.1 # Replace with actual on-prem management IP

BGP Convergence Time

BGP peering may take 5-15 minutes after VPN connection is established. If status shows "Connecting," wait and recheck.

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Bastion Connectivity Tests

1. Verify Bastion Status

Azure Portal:

1. Navigate to Bastions
2. Select the Bastion host
3. Verify Status: Succeeded

2. Test Bastion Connection (if VMs deployed)

If optional NDM or Utility servers were deployed:

1. Azure Portal → Virtual machines
2. Select the VM
3. Click Connect → Bastion
4. Enter credentials
5. Verify successful connection

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DNS Resolution Tests

1. Verify DNS Resolver

Azure Portal:

1. Navigate to Private DNS zones
2. Select the management DNS zone
3. Check Virtual network links
4. Verify linked to management VNet

2. Test DNS Resolution

From Azure Cloud Shell:

# Test DNS resolver for cluster nodes
nslookup c01-n01-prd-ral.azlocal.internal 10.100.1.164

# Replace with:
# - Your cluster node hostname
# - Your DNS resolver IP (from dns subnet)

Expected: Returns the node's IP address.

From Windows VM (if deployed):

# Test DNS resolution
Resolve-DnsName c01-n01-prd-ral.azlocal.internal

# Test DNS forwarding
Resolve-DnsName google.com

3. Verify DNS A Records

Azure Portal:

1. Private DNS zones → Select zone
2. Click Record sets
3. Verify A records for all cluster nodes:

Name	Type	IP Address
c01-n01-prd-ral	A	10.100.3.101
c01-n02-prd-ral	A	10.100.3.102
c01-n03-prd-ral	A	10.100.3.103

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Validation Checklist

VPN Connectivity

• VPN connection status is Connected
• BGP peering established
• Routes learned from on-premises
• On-prem gateway can reach Azure VNet (if testable)

Bastion Connectivity

• Bastion host status is Succeeded
• Can connect to VMs via Bastion (if VMs deployed)
• No connectivity errors

DNS Resolution

• Private DNS zone linked to VNet
• DNS resolver deployed and running
• A records created for all cluster nodes
• DNS resolution working from Azure resources
• Conditional forwarding working (if configured)

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Troubleshooting

VPN shows "Connecting" for extended time:

• Verify on-prem gateway configuration matches Azure settings
• Check pre-shared key (PSK) matches both sides
• Confirm on-prem firewall allows IKE/IPsec (UDP 500, 4500)

BGP peering not establishing:

• Verify BGP ASN correct on both sides
• Check BGP IP addresses match configuration
• Confirm no ACLs blocking BGP (TCP port 179)

Bastion connection fails:

• Verify VM is running
• Check NSG allows inbound from Bastion subnet
• Confirm credentials are correct

DNS resolution not working:

• Verify DNS resolver deployed in correct subnet
• Check VNet link exists for Private DNS zone
• Confirm A records created with correct IPs

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Navigation

Previous	Up	Next
Task 01 - Verify Resources	Phase 03 - Validation	Task 03 - Validate Configuration

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Version Control

Version	Date	Author	Changes
1.0.0	2026-03-24	Azure Local Cloudnology Team	Initial release