RE: [Firewalls] Help me understand servers behind NAT routers
From: Jayant Shukla (jshukla@trlokom.com)Date: 11/07/02
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From: "Jayant Shukla" <jshukla@trlokom.com> Date: Wed, 6 Nov 2002 20:55:30 -0800
> -----Original Message-----
> From: firewalls-admin@section5.cyberbase7.com [mailto:firewalls-
> admin@section5.cyberbase7.com] On Behalf Of Zaf
> Sent: Wednesday, November 06, 2002 8:33 PM
> To: firewalls@section5.cyberbase7.com
> Subject: [Firewalls] Help me understand servers behind NAT routers
>
> I recently got broadband and the day I got it I installed zonealarm.
> ZA flagged numerous apps as requesting server privliges (foggy memory
> says email, AV updater, ad blocking, file sharing). I removed the ZA
> but installed a cheapie (linksys) router with NAT. All these apps
> magically work behind the NAT, so I am a bit confused. Does the NAT
> expose these ports on the WAN side of the router? If so, I imagine
> these ports are a security risk. Since many of these programs are
> freeware, I imagine this would also be a nice place to install a
> trojan? A trojan installed in server software would to me appear to
> be the a good place, since you would allow this port to be open.
>
> Do I understand this properly?
As long as you do not put the computer in the DMZ or forward some ports
from the NAT to the computer, there is no worry.
All those programs are working from behind the NAT because you are
initiating the network connection from behind the NAT to outside. The
default policy on NATs is to drop all incoming network connections.
Regards,
Jayant
www.trlokom.com
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