Problem with ipcop two green LAN

[bof]

(sorry if section in not this)
Hi, I have a problem with IPCOP
ipcop with green and red.
192.168.1.1 for green and 170.x.x.x for red.
I have added a new router to connect with another network (192.168.10.0)
this router have 192.168.1.2.

Adding static route: /sbin/route add -net 192.168.10.0 netmask 255.255.255.0 gw 192.168.1.2 dev eth0 and work fine,
but i can't do reverse (192.168.10 to 192.168.1.0).
If change pc gateway to 192.168.1.2 reververse work fine; the problem is ipcop blocked packet.

I also add iptables -A CUSTOMFORWARD -i eth0 -o eth0 -j ACCEPT and ping work fine, but the TCP packets don't work!!
Can I skip this rule?
Tnk