[Openswan Users] Modifying the ip route command

Andy fs at globalnetit.com
Thu Apr 27 23:14:23 CEST 2006

On Fri, 2006-04-28 at 09:38 +0800, Mark van Proctor wrote:
> Hi all,
> I need to modify the ip route that is generated when I establish a site to
> site VPN.
> I am connecting to a netkey/racoon (RHEL 3) server (no Openswan installed)
> from a netkey/openswan (RHEL 4) server. I have been unable to get the racoon
> side to establish multiple VPNs - one for gateway to gateway, one for net to
> net traffic and one each for net to gateway - so I am managing with just a
> net to net connection.
> I have managed to get the traffic involving the gateway machines to tunnel
> through this traffic by modifying the ip route manually to include a "src
> LEFTSRC". I am wondering how I can do this automatically through the
> ipsec.conf file? the ultimate command that needs to get called is as
> following:
> ip route add to RIGHTSUBNET dev eth0 scope link src LEFTSRC  <-- where
> LEFTSRC is ultimately my internal IP address that falls within LEFTSUBNET,
> thus forcing traffic to go through the VPN.
> Does this make sense?
> Is there any way of making such a change in the ipsec.conf file

Yes. Add leftsourceip=LEFTSRC to your conn.

>  or will I
> have to provide a separate updown script for this connection which performs
> the modified command... Also, if I have to provide a separate updown script,
> can I provide an additional variable in the ipsec.conf file called LEFTSRC
> such that it is available in the updown script? Or will the parser fail the
> ipsec.conf file with an unknown variable?
> Thanks in advance,
> Mark
> Mark van Proctor
> Metech Pty Ltd
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Andy <fs at globalnetit.com>

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