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Re: [Openvpn-users] topology subnet and arp


  • Subject: Re: [Openvpn-users] topology subnet and arp
  • From: Richard Quintin <Richard.Quintin@xxxxxx>
  • Date: Wed, 02 Aug 2006 16:23:27 -0400

I think I have the answer to my own question.... :)

ARP Proxy seems to do the trick.  If anyone has a better idea please 
send it along.

On the vpn server:
arp -i eth1 -Ds 10.8.0.2 eth1 pub

I can put something like this in a learn-address script.  Sure will be 
a lot simpler than the learn-address I had going for bridging. :)

Richard Quintin wrote:
> Hi all,
> 
> I'm working on moving from a sort of working bridged vpn to a topology 
> subnet.  My hope is that it will simplify my life considerably.
> 
> # openvpn --version
> OpenVPN 2.1_beta14 i686-pc-linux [SSL] [LZO2] [EPOLL] built on Aug  2 2006
> Developed by James Yonan
> Copyright (C) 2002-2005 OpenVPN Solutions LLC <info@xxxxxxxxxxx>
> 
> How do I setup the route/firewall to allow traffic between a vpn client 
> and host sitting behind the vpn server.
> 
> vpn client (10.8.0.2) <---vpn--->(tun0 - 10.8.0.1) vpn server (eth1 - 
> 10.82.162.250) <------>(10.82.162.116) host
> 
> Client is able to connect fine.  Pings to 10.8.0.1 are fine.
> I push all 10.0.0.0/8 through tun0.
> 10.0.0.0        *               255.0.0.0       U     0      0        0 tun0
> 
> So now when I ping 10.82.162.116, the host (10.82.162.116) sees the 
> ping, but is unable to respond because no one responds to an arp who-has 
> 10.8.0.2.
> 
> Should the vpn client be responding or should the vpn server be 
> responding on behalf of the client?  In either case can someone suggest 
> the proper ip/eb/arptables rules to make it so?
> 
> Thanks!

-- 
Richard Quintin,
DBA Information Systems & Computing,
DBMS Virginia Tech

~ Never argue with an idiot. They drag you down to their level then beat 
you with experience.
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