Kurt D. Starsinic on Thu, 1 Apr 1999 20:45:19 -0500 (EST)

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Re: how secure is nat?

Jason Staloff wrote:
> My ISDN router uses NAT so it can hold a static IP address on my side as
> well as the dynamic address given it by my ISP.
> I ran into a Web site that told me my IP address, and whaddya know it told
> me the local address, Is this a security risk? Could my router
> allow someone get into my network? OK I know that's a really naive way to
> put it.... What should I do to stay as secure as possible?
> I'm assuming this was done by reading the CGI environment variable


> Is there any other way this information could be passed along?


> Is NAT reasonably safe?

    Define `safe'.  Noone can establish a connection to your machine
from the other side of the NAT.  Will that do?

* Kurt Starsinic (kstar@isinet.com) ------------------ Technical Specialist *
|    `Using encryption on the Internet is the equivalent of arranging an    |
|     armored car to deliver credit-card information from someone living    |
|     in a cardboard box to someone living on a park bench.'                |
|                              - Gene Spafford                              |
Institute for Scientific Information                   http://www.isinet.com/

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