Alan Madill wrote:

Tom Eastep wrote:
Tom Eastep wrote:
Alan Madill wrote:
Hi,

I want to connect two satellite offices to a main office using openswan and ipsec vpn.
SatSite1  ---  Main  ---  SatSite2
192.168.30.0/24 --- 1.1.1.1 --- 2.2.2.2 --- 192.168.20.0/24 --- 2.2.2.2 --- 3.3.3.3 --- 192.168.25.0/24 Where 1.1.1.1, 2.2.2.2, and 3.3.3.3 are the public ip addresses of the three sites

I have successfully got the VPNs working between the the two satellite sites and the main site but I can't figure out how to route traffic from one satellite site to the other.
You can't 'route' the traffic. You must add additional IPSEC tunnels to tunnel the forwarded traffic between your firewall and the remote gateways.
Actually, that is a bit misleading. You only need one 'tunnel' from each site but you need additional SPD entries that make the site-to-site traffic go through the tunnel. I know how to do that using ipsec-tools and Racoon but not with openswan.

The lack of actual interfaces confuses me a bit. :-) What would the SPD entries look like? I should be able to RTM and do the same with openswan if I have an idea of what I'm trying to do.

OpenSwan's history is in the days when each IPSEC tunnel had it's own interface. Consequently, I think that people who try to use OpenSwan with PF_KEY tend to be confused before they even start. My $.02us

You need four additional SPD entries:

Traffic from site1->site2 use tunnel from site1 to fw
Traffic from site1->site2 use tunnel from fw to site2
Traffic from site2->site1 use tunnel from site2 to fw
Traffic from site2->site1 use tunnel from fw to site1


Are there any special considerations for shorewall in adding the additional traffic?

Assuming that you already have site1 and site2 zones, just have ACCEPT policies for site1<->site2.

-Tom
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