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Re: [Openvpn-users] Strange issue... client/server - routed setup


  • Subject: Re: [Openvpn-users] Strange issue... client/server - routed setup
  • From: Charles Duffy <cduffy@xxxxxxxxxxx>
  • Date: Wed, 01 Nov 2006 16:50:58 -0600

Chris Stankaitis wrote:
> I am setting up an openvpn server for road warriors, have the road
> warriors using Linux laptops and the server is also on Linux.  I can
> connect into the VPN from the client, auth using our OTP Two Factor
> Auth, get the routes and redirect-gateway from the server, however when
> I try and hit anything internal to the vpn, the VPN server isn't arp'ing
> for the client.

It's not expected behavior (unless you go out of your way to set up 
proxy ARP at an OS level) for the VPN server to do ARP, and most folks 
using OpenVPN do not have this kind of setup.

For a routed VPN, it's more typical that your VPN subnet is not within 
your LAN subnet; thus, instead of trying to do ARP to find the host 
within your current LAN, packets intended to the VPN go to the default 
gateway, which then has a route to the VPN server for any packets 
destined for the VPN subnet, so packets get to where they need to be 
with no ARP involved.

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