[WLANware] problems routing openwrt backfire

[johnny.bee at gmx.de]

Hello,

we use a branded openwrt backfire with freifunk support and our theme
for our freifunk net in Bonn. To interconnect the router we actually use
openvpn (tap device), because of the distance between them.
Everything works fine, but we have one problem:
The router themselves can reach every other freifunk node about wlan or
vpn. OLSR works about the wlan and the tap-device.
But every client with an dhcp assigned IP-Adress can only reach the
Internet and other freifunk nodes, which the router can directly reach
about the wlan, but no one about the vpn.
So it seems to be an routing problem, but i'm not so firm to know the
right iptables rules.
Can someone please tell me, how to make it work, that normal Laptops
with an DHCP-Adress can reach the other Freifunk nodes?
Thank you for your help.

Greetings
Thomas