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Re: [FW1] Problem with NAT
> > > On IP440 with CP FW-1 4.0 SP5 I have hidded all intranet addresses, but
> > > sometimes quite seldom some addresses are not hidden. Could anybody comment it ?
> >
> > Duh? I guess you have your intranet addresses NATted... :-) If so, what
> > do you mean with "sometimes some addresses ar not hidden"??? Do you mean
> > that internal IP's are accesible from outside? Do you mean internal
> > addresses can reach external networks?
>
> I mean that internal addresses can reach external network. But not
> always, just sometimes randomly and quite seldom. I have Dynamic NAT
> (many IP's use one valid IP address to do NAT).
I'm sorry, and I can look like a stupid... but I can't see the error: If you
have NAT, then your internal IP's should be able to reach external networks:
That's why you want to setup NAT.
Which services are you able to reach from your internal machines? are you
able to ping? can you use a web browser? can you telnet? This could be a
routing
problem... but I'm not sure... Do you have invalid addresses internally? (I
mean 10.* , 192.168.* or so...)
Theorically, If you want to deny all traffic from internal network, simply
allow the traffic you want to pass your firewall: FW-1 uses philosophy
"things don't expressly allowed are forbidden".
If you are able to access external net, theorically you should have:
- A proxy server allowed by firewall to reach external NET (with NAT or a
simple "allow rule").
- A "NAT server". This could be a router, a firewall or something.
- If you have valid IP addresses in your internal network, an "allow" rule
Another possible issue: Do you have "smart" users that can try to bypass
firewall using another router as default or some trick like this?
This is what comes to my mind... :-| Hope this helps in some way. :-)
-- M. Hoz
-- M. Hoz
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