iptables & vypress

[Luca Ferrari <fluca1978@xxxxxxxxxxx>]

Hi,
I've got two networks, 192.168.1.0 and 192.168.4.0, that are connected 
thru an ADSL and a couple of firewalls (with iptables). Now I've got 
some problems with the Vypress Messenger, a chat program that 
communicates using the 7777 port. The problem is that outgoing traffic 
from 192.168.4.0 is permitted, while incoming not, thus 192.168.4.0 can 
send messages to the other network, but the 192.168.1.0 cannot. The 
following is an excerpt of the iptables configuration for the network 
192.168.1.0 on the 192.168.4.0 firewall:

[root@firewall script]# iptables-save | grep 192.168.1
-A INPUT -s 192.168.4.0/255.255.255.0 -d 192.168.1.0/255.255.255.0 -p 
tcp -j ACCEPT
-A INPUT -s 192.168.4.0/255.255.255.0 -d 192.168.1.0/255.255.255.0 -p 
udp -j ACCEPT
-A FORWARD -s 192.168.4.0/255.255.255.0 -d 192.168.1.0/255.255.255.0 -p 
tcp -j ACCEPT
-A FORWARD -s 192.168.4.0/255.255.255.0 -d 192.168.1.0/255.255.255.0 -p 
udp -j ACCEPT
-A OUTPUT -d 192.168.1.0/255.255.255.0 -o eth1 -p udp -j ACCEPT


I cannot see what's wrong here, since all the traffic among 192.168.1.0 
and 192.168.4.0 is permitted. I'm pretty sure the problem is in the 
iptables of 192.168.4.0 network cause if I cannot directly (i.e., 
bypassing the iptable firewall) vypress works.
Any suggestion?

Thanks,
Luca

--
Luca Ferrari
fluca1978@xxxxxxxxxxx
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