Security Basics mailing list archives

RE: Request for feedback on ip-nat


From: "Shawn Jackson" <sjackson () horizonusa com>
Date: Tue, 3 Feb 2004 12:33:22 -0800


From: Joris L. [mailto:jorislambrecht () pandora be]
I'm currently investigating possible reasons for client-programs 
to a im network to disconnect for no real apparent reason. What 
could be the possible causes, what could cause a time-out to 
occur ? 

Some 'cheap' NAT boxes will clear their connection cache, or at
least the oldest connections, to conserve memory. I've noticed
this on older Netgear and some linksys boxes at busy offices.

Additionally some real cheap boxes have a limitation to the
actual number of NAT connections they can route. I don't
know the detail of the MSN protocol, but it could be experience
a timeout due to latency.

Does is die under use? Or while it's idle? Are you connecting
to the I-Net or to another network? Are there any security
policies in place on the NAT box? Is the NAT box a firewall?
What model/type?

Shawn Jackson
Systems Administrator
Horizon USA
1190 Trademark Dr #107
Reno NV 89521

www.horizonusa.com
Email: sjackson () horizonusa com
Phone: (775) 858-2338
             (800) 325-1199 x338


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