IPSEC routing problem...

Hi!

I have problem to get routing work to all subnets.
I have Linux firewall (Debian sarge 2.6.8 default kernel) with several
interfaces:

eth0 - x.x.x.x (public IP address, internet)
eth1 - 192.168.20.0/24 - local network
eth2 - 192.168.21.0/24 - local network
eth3 - 192.168.22.0/24 - local network
eth4 - 10.10.20.0/24 - local network
eth5 - 10.10.21.0/24 - local network

This firewall also uses IPSEC to create connections to remote location,
so there is IPSEC tunnel to LAN 192.168.145.0/24. This tunnel works OK.
In remote location, there is NetGear FVS318 router. Please tell me how
to set routes to get access from remote location (via IPSEC) to subnets
behind eth1 and eth4. With static routes that is not possible, as far as
I know. What I tried was RIP (quagga, zebra), but problem is that zebra
will not send broadcast messages to this remote location, cause there is
no physical device for IPSEC.
Any ideas?

Best regards,

J.N