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

Question

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

default GW on C is the IP of Node B's tunnel0 interface. D can ping internet via C whitout issue. — Sirber, Jun 07 '12 at 13:51

score 0 · Answer 1 · answered Jun 07 '12 at 13:44

0

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.

answered Jun 07 '12 at 13:44

Sc0rian

1,021
7
16

it's there: `0.0.0.0 10.20.200.1 0.0.0.0 UG 0 0 0 tunnel0` – Sirber Jun 07 '12 at 13:52
if that is your correct gateway then make sure you have the nameservers setup properly. Try pinging the google dns servers, but the ip `ping 8.8.8.8`. if the ip pings, then it is probably no dns being picked up. – Sc0rian Jun 07 '12 at 13:57

score 0 · Accepted Answer · answered Jun 07 '12 at 14:06

0

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

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

Sorry :(

answered Jun 07 '12 at 14:06

Sirber

328
5
18

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

2 Answers2