I am trying to connect a servers-network to several remote clients-networks using ipsec/strongswan. Normally I could do that easily at Layer 3 on my own without troubling the forum.

However, I need to pass L2 packets from side to side - this includes ARP - because the machines at the initiator left side are being given IP addresses from a DHCP server located at the responder left side.

Network description:

- On the initiator machine I have a tap interface that's bridged with eth0 that connects to a physical switch. The DHCP clients connect to this switch.
I have several of these networks.
Each of these networks is a road-warrior style setup - the network can pop up anywhere in the world.

- On the responder machine I also have a tap interface that's bridged with eth0 that connects to a switch. The DHCP server and other servers connect to this switch. I must assign IPs to the initiator-side-clients from the responder-side DHCP server - I can't have DHCP servers on the remote networks at the clients end (where the initiator lives).

Is there a way to tell strongswan/ipsec that it should take all the traffic from the tap interface and push it through the tunnel to make it appear at the other side tap interface? If needed - I don't mind setting up multiple tap interfaces on the responder - each serving one initiator.

Can you please point me in the right direction?
Do you have an example similar to my scenario that I can look at to learn from?

Thank you very much.
A long time openvpn sysadmin now turned strongswan sysadmin!

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