NSF VPN Tunnel Route

Ronnel Compayan Lv1Posted 16 May 2024 08:26

Does anyone here have an idea on how troubleshoot VPN Tunnel Route problem? The branch and HQ connection are okay. I can ping from a branch to HQ. The problem is I cannot ping branch 1 to branch 2. I follow the guide on how to do tunnel route. Please help

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HiHi,

Please verify the Tunnel Route settings on the pages of both branches to enable the Tunnel Route.

In the Branch A Tunnel page, please input the destination IP address for Branch B.
Then, proceed to the Tunnel page of Branch B, and please enter the destination IP address for Branch A.

For further information, please consult the attached file which includes a case study.
Tunnel Route.pdf (206.86 KB, Downloads: 62)
Is this answer helpful?
Farina Ahmed Posted 16 May 2024 14:24
  
If the VPN tunnel is properly established between the branch and HQ, and you can ping from the branch to HQ but not from branch 1 to branch 2, it suggests a routing issue.
1) First, ensure that the routes for branch 1 and branch 2 are correctly configured on the respective devices, pointing towards the VPN tunnel interface.
2) Verify that there are no overlapping IP ranges between branch 1 and branch 2.
3) Check the firewall rules on both branches to ensure they allow traffic between them via the VPN tunnel.
4) Also verify the VPN tunnel configuration, ensuring it allows traffic between branches.
5) Check for any network device or configuration issues that could be blocking traffic between branch 1 and branch 2.
Newbie517762 Lv5Posted 16 May 2024 14:49
  
HiHi,

Please verify the Tunnel Route settings on the pages of both branches to enable the Tunnel Route.

In the Branch A Tunnel page, please input the destination IP address for Branch B.
Then, proceed to the Tunnel page of Branch B, and please enter the destination IP address for Branch A.

For further information, please consult the attached file which includes a case study.
Tunnel Route.pdf (206.86 KB, Downloads: 62)
Enrico Vanzetto Lv3Posted 16 May 2024 17:39
  
Hi, I recommend that you first validate the Routing Table. This can be done by examining the routing table on both Branch 1 and Branch 2 devices. It’s crucial to ensure that the routing table contains an entry for the network of the other branch.

Next, make sure that no firewall rules are obstructing traffic between Branch 1 and Branch 2. This is a critical step in maintaining smooth communication between the two branches.
Rotring Lv2Posted 17 May 2024 11:30
  
HI,
Troubleshooting a VPN tunnel route issue where Branch 1 can't ping Branch 2 can be tricky. Here are some steps to help you diagnose the problem:

1. Verify Routing Configuration:

Check Static Routes:
Ensure static routes are configured on both Branch 1 and HQ routers to point traffic destined for Branch 2's subnet through the VPN tunnel interface.
Double-check the subnet address and gateway (VPN tunnel interface IP) for Branch 2 in the static route configuration.
Verify Dynamic Routing Protocol (if used):
If you're using a dynamic routing protocol like OSPF or BGP, confirm that the routes for Branch 2's subnet are being advertised correctly by HQ and propagated to Branch 1.

2. Inspect VPN Tunnel Health:
Check VPN Status:
Verify the VPN tunnel between Branch 1 and HQ is established and functioning. Look for indications of "up" or "connected" status in the VPN client or router configuration.
Analyze Logs:
Check VPN logs on both Branch 1 and HQ routers for any errors related to routing or tunnel establishment. These logs might provide clues about why traffic isn't being forwarded correctly.

3. Test Connectivity:

Ping from HQ:
Try pinging Branch 2's subnet from the HQ router itself. This helps isolate if the issue lies within Branch 1 or the routing between HQ and Branch 1.
Trace Route:
Perform a traceroute from Branch 1 to Branch 2. This can reveal where the packets are getting dropped or failing to reach their destination.

4. Additional Considerations:

Firewall Rules:
Ensure firewall rules aren't blocking ICMP traffic (ping) between Branch 1 and Branch 2's subnet.
DNS Resolution:
Verify that Branch 1 can resolve Branch 2's hostname or IP address correctly. DNS resolution issues can lead to routing problems even if the VPN tunnel is established.

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