Routing involving XP bridge

Hi!

I've got an XP machine connected to an ADSL router via a wireless USB
adapter. On this machine i've bridged multiple network interfaces, and
the ip is 10.0.0.1. The modem/router/gateway is 10.0.0.2.

To this machine is connected a Linux box with 2 ethernet adapters. Ip on
eth1 is 10.0.0.3 and eth0 is 11.0.0.1.

To this machine, on eth0 is connected another Linux machine with ip
11.0.0.123.

I've enabled ip forwarding on the 10.0.0.3 by echoing 1 to
/proc/sys/net/ipv4/ip_forward; Also, from this machine I can access the
internet, and ping 10.0.0.1, 10.0.0.2 and 11.0.0.123

On the 10.0.0.1 machine I added a route for 11.* via 10.0.0.3. From this
machine I can ping 11.0.0.123 and access the internet.

From 11.0.0.123 I can ping 10.0.0.3 and 10.0.0.1 (both the other
machines) But not 10.0.0.2.

So it seems that the XP machine doesnt forward my 11.* traffic. Any ideas?

Its probably something simple and I'm just an uneducated idiot!
Thanks for the help!