[isf-wifidog] Multiple Gateway Administration

Tim Mitchell Tim at Mitchworld.com
Ven 14 Déc 10:41:03 EST 2007

> SSH can be impossibile to use when the gateway is behind a NAT and there
> is no DNAT rules. An OpenVPN setup will solve this issue.
or there are several gateways behind one firewall. OpenVPN it is then.

> > How do you keep an eye on usage?
> > 
> Nagios will be your friend.

Thanks - will have a look at it.

> > I've blocked port 25 so hopefully this will help to stop any gateways
> > being used to send spam. However this won't help if there are any open
> > relays listening on a port other than 25.
> >   
> I don't understand your problem. Please explain better.
No real problem, just an observation using open SMTP relays as an
I know of mail servers that listen on port 26 and others that listen on
port 2525. So just blocking the standard port for a service you don't
want to allow out of your network isn't necessarily going to work.

Should this be a worry or should I just accept that an open network is
open so should be open to all services (but then why do I block port

thanks for your reply

- Tim

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