nanog mailing list archives
Re: end2end? (was: RE: Where NAT disenfranchises the end-user ...)
From: Leo Bicknell <bicknell () ufp org>
Date: Fri, 7 Sep 2001 14:49:46 -0400
On Fri, Sep 07, 2001 at 10:55:49AM -0700, Mike Batchelor wrote:
NAT rewrites certain packet data fields (src addr, src port, sometimes mac addr). So does a ordinary router (ttl decrement). One breaks end2end, the other does not. What is the difference?
NAT rewrite more than that, try reading http://www.cisco.com/warp/public/cc/pd/iosw/ioft/ionetn/prodlit/1195_pp.htm In particular, it rewrites addresses _in the data portion of the packet) for the following protocols: ICMP, FTP, NetBIOS, RealAudio, CuSeeMe, DNS, Netmeeting, H.323, PPTP and several others. That's what makes it violate the end2end principal, your _data_ is changed by NAT. -- Leo Bicknell - bicknell () ufp org Systems Engineer - Internetworking Engineer - CCIE 3440 Read TMBG List - tmbg-list-request () tmbg org, www.tmbg.org
Current thread:
- RE: Where NAT disenfranchises the end-user ..., (continued)
- RE: Where NAT disenfranchises the end-user ... Charles Sprickman (Sep 07)
- Re: Where NAT disenfranchises the end-user ... bmanning (Sep 07)
- Re: Where NAT disenfranchises the end-user ... Jon Mansey (Sep 07)
- Re: Where NAT disenfranchises the end-user ... bmanning (Sep 07)
- Re: Where NAT disenfranchises the end-user ... Valdis . Kletnieks (Sep 07)
- Re: Where NAT disenfranchises the end-user ... Scott Francis (Sep 07)
- RE: Where NAT disenfranchises the end-user ... Charles Sprickman (Sep 07)
- end2end? (was: RE: Where NAT disenfranchises the end-user ...) Mike Batchelor (Sep 07)
- Re: end2end? (was: RE: Where NAT disenfranchises the end-user ...) Joel Jaeggli (Sep 07)
- Re: end2end? (was: RE: Where NAT disenfranchises the end-user ...) Jon Mansey (Sep 07)
- Re[3]: Where NAT disenfranchises the end-user ...) Richard Welty (Sep 07)
- Re: end2end? (was: RE: Where NAT disenfranchises the end-user ...) Leo Bicknell (Sep 07)
- RE: end2end? (was: RE: Where NAT disenfranchises the end-user ...) Mike Batchelor (Sep 07)
- Re: end2end? (was: RE: Where NAT disenfranchises the end-user ...) Joel Baker (Sep 07)
- Re: end2end? (was: RE: Where NAT disenfranchises the end-user ...) Leo Bicknell (Sep 07)
- Re: end2end? (was: RE: Where NAT disenfranchises the end-user ...) Andy Dills (Sep 07)
- Re: end2end? (was: RE: Where NAT disenfranchises the end-user ...) Leo Bicknell (Sep 07)
- Re: end2end? (was: RE: Where NAT disenfranchises the end-user ...) steve uurtamo (Sep 07)
- RE: end2end? (was: RE: Where NAT disenfranchises the end-user ...) Tony Hain (Sep 07)
- Re: end2end? (was: RE: Where NAT disenfranchises the end-user ...) Andy Dills (Sep 07)
- Re: end2end? (was: RE: Where NAT disenfranchises the end-user ...) Adam McKenna (Sep 07)
- Re: end2end? (was: RE: Where NAT disenfranchises the end-user ...) bmanning (Sep 07)