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Accepted
Sirber
Asked: 2012-06-08 05:38:37 +0800 CST

4 nodes to the internet, everything works except 3rd node

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I have 4 nodes to the internet:

Internet <--> Node A <--> Node B <--> Node C <--> Node D

Node A: main gateway, manage internet
Node B: gateway/tunnel to node C
Node C: gateway/tunnel to node B
Node D: FreeNAS server

Between B and C is a semi-private network. Default route on Node C is via the tunnel.

Can ping:

A: Internet, A, B, C, D
B: Internet, A, B, C, D
C: B, C, D
D: Internet, A, B, C, D

I really don't get it...

edit

traceroute 8.8.8.8
traceroute to 8.8.8.8 (8.8.8.8), 64 hops max, 52 byte packets
 1  10.20.1.1 (10.20.1.1)  0.959 ms  0.753 ms  0.535 ms
 2  10.20.200.1 (10.20.200.1)  4.993 ms  5.010 ms  4.804 ms
 3  10.20.2.1 (10.20.2.1)  5.152 ms  5.218 ms  5.046 ms
 4  modemcable233.11-37-24.static.videotron.ca (24.37.11.233)  5.638 ms  5.684 ms  5.645 ms

Traceroute from D to internet:
1: Node C
2: Node B (tunnel ip)
3: Node A
4: Internet

networking route

2 Answers

  1. probably the gateway on C.

    netstat -nr will show you what gateways are in the route table.

    you should see

    0.0.0.0 <gatewayaddress>

    If it is not there, then add it into the Ethernet adapter settings.

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  2. Best Answer

    Node A was missing a route to the tunnel between B and C.

    Pings went from C->B->A->Internet->Internet

    Sorry :(

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