VPN between two servers

[Torsten Schlabach]

 > Have you enabled IP forwarding on both machines?

This was the problem! Thank you for the hint.

Actually,

echo 1 > /proc/sys/net/ipv4/ip_forward

made the difference.

Regards,
Torsten


Brian Candler schrieb:
> On Fri, Apr 21, 2006 at 11:16:22AM +0200, Torsten Schlabach wrote:
> 
>>I would like to use tinc to create a virtual private network that just
>>exists between the two servers. I want a virtual interface on each of the
>>servers, probably with a 192.168.x.x address so that I could have some
>>daemon on server A listen to say 192.168.1.1 only and have server B connect
>>to that daemon through the tinc VPN from 192.168.1.2 for example.
>>
>>I think all the samples work from the assumption that the servers are
>>gatways that have networks behind them. I have setup my boxes according to
>>the samples, but I cannot ping between the virtual interfaces.
> 
> 
> Did you configure 192.168.1.1 and 192.168.1.2 as loopback addresses on the
> two machines? (e.g. ifconfig lo:0 192.168.1.1/32)
> 
> Have you chosen the right source address when pinging? e.g.
> 
>     ping -S 192.168.1.1 192.168.1.2
> 
> Have you enabled IP forwarding on both machines?
> 
> What does tcpdump show when you do the ping command shown above?
> 
> Just a few suggestions from someone who lurks on the TINC list rather than
> actually uses it :-) Another option you could consider is to configure IPSEC
> transport mode between the two machines, but that's not TINC.
> 
> Regards,
> 
> Brian.
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