Tunnel Subblock

[missengineer]

Hello,

I have problem with tunnel routing. The issue that I am pinging tunnel IPs but cant ping to Loopback IP from Site A to Site B. It is working one way. I check my routing table but network does not seem there.

In Site B's router shows tunnel subblock. What does it mean? 

In other hand;

for Site B ; NVI 0 IP is Ethernet port's IP but in Site A, NVI 0 IP is loopback IP. Is it important? 

I am pinging 10.1.1.1 IP from B to A and traceroute shows tunnel IPs but when I  try to ping 10.2 .1.1, The ping goes to different IPs. you can see traceroute screenshot on attachment. It does not go to tunnel IP.  

Is it related with ISP's routing or mine? 

[Georg Pauwen]

Hello,

post a diagram of your topology, as well as the running config (sh run) of the devices that function as the tunnel endpoints...

[Alex Pfeil]

I agree with Georg. We will need the running configs and diagram.

[missengineer]

Hi,

Thank you for reply. I am sharing topology and configurations. Actually this configuration was working but we made IMEI registration a few days ago. Celluar card active again but configuration not working. 

[Georg Pauwen · Accepted solution]

Hello,

I am not really sure what the goal of your design is. You are tracking the cellular, which means nothing is routed through the cellular until the tunnel goes down...but the tunnel needs the cellular.

Either way, try to just use the routes below:

Site A

ip route 10.2.1.0 255.255.255.0 Tunnel0
ip route 0.0.0.0 0.0.0.0 Cellular0/3/0

Site B

ip route 10.1.1.0 255.255.255.0 Tunnel0
ip route 0.0.0.0 0.0.0.0 Cellular0/3/0

[missengineer]

Dear Georg,

This routing configuration is already written for each site.

"ip forward-protocol nd
ip route 10.2.1.0 255.255.255.0 Tunnel0 track 254
ip route 0.0.0.0 0.0.0.0 Cellular0/3/0
ip route 94.79.93.248 255.255.255.255 Cellular0/3/0 254
no ip http server
no ip http secure-server"

[missengineer]

When I write sh ip route x.x.x.x

"sh ip route 94.79.93.248
Routing entry for 94.79.93.248/32
Known via "static", distance 254, metric 0 (connected)
Routing Descriptor Blocks:
* directly connected, via Cellular0/3/0
Route metric is 0, traffic share count is 1"

[missengineer]

Hi Georg,

I solved it! Thank you. Just change my routing configuration from ip route 10.2.1.0 255.255.255.0 Tunnel0 track 254  to ip route 10.2.1.0 255.255.255.0 Tunnel0 and it  started to communicate. 

Thank you!