Network access OK but server cannot use internet

Ok hoping someone can help me, I have little hair left after this one...

I have a home network set up with a Redhat 8 box and 3 client PCs. The
redhat box has eth0 connected to the cable modem for Internet and eth1 as
the LAN which goes to a hub.

I have IP tables setup for NAT with Masquerading and forwards are accepted
from eth1. Inputs are also always accepted from eth1. Output policy is
ACCEPT, except for netbios stuff on eth0 which is dropped.

The problem is that client machines can use the internet no problem through
the server, but the server can not use the internet itself?!? Pages and
things keep timing out etc. Cannot ping using name or IP. My mailserver
(external) on the box can receive mail but cannot send at all (DNS
failiure). My ISP doesn't block any of this stuff, I know that for a fact.

Any ideas??

--

Ha! That did it, thanks a million!

--

"Ian Northeast" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> George Hewitt wrote:
> >
> > Ok hoping someone can help me, I have little hair left after this one...
> >
> > I have a home network set up with a Redhat 8 box and 3 client PCs. The
> > redhat box has eth0 connected to the cable modem for Internet and eth1
as
> > the LAN which goes to a hub.
> >
> > I have IP tables setup for NAT with Masquerading and forwards are
accepted
> > from eth1. Inputs are also always accepted from eth1. Output policy is
> > ACCEPT, except for netbios stuff on eth0 which is dropped.
> >
> > The problem is that client machines can use the internet no problem
through
> > the server, but the server can not use the internet itself?!?
>
> Have you omitted the state matching rule to allow responses back in the
> *input* chain? E.g.:
>
> iptables -A INPUT -i $EXTIF -m state --state ESTABLISHED,RELATED -j
> ACCEPT
>
> Regards, Ian