[Techtalk] Routing/Bridging Question

Stephan Zaniolo nereid at speakeasy.net
Wed Nov 20 16:39:08 EST 2002

  I'm trying to setup a VPN between two networks and having a problem 
routing traffic across the end points. I'm using tinc 
(http://tinc.nl.linux.org/) and Debian 3.0 (testing, kernel 
2.4.18-bf2.4). The boxes I'm setting up the VPN between look like this:

BoxA - eth0 = eth1 = vpn= (setup by 
BoxB - eth0 = eth1 = vpn= (setup by 

When tinc is up on both boxes, I can ping both IPs on both boxes (e.g. 
from BoxA, ping works fine). However, I can't ping any of 
the boxes on the network beyond (e.g. BoxA can't ping and can't ping BoxA). When I ping from A I can see 
the ping crossing the VPN, so I know the VPN is properly setup, but when 
I ping A from I don't see any traffic going across the VPN. 
I don't think it's a problem with my VPN. I think I haven't properly 
setup my boxes to route (bridge?) traffic from vpn to eth0 and eth0 to vpn.

Here's what my routing table looks like on Box A

Destination     Gateway         Genmask         Flags Metric Ref    Use 
Iface   U     0      0        0 eth0   U     0      0        0 eth1   U     0      0        0 vpn         UG    0      0        0 eth0

Does anyone have any ideas or resources as to what I need to do?


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