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Re: NAT for an ISP
From: Dan Armstrong <dan () beanfield com>
Date: Wed, 04 Jun 2003 15:51:56 -0400

90% of our customers all use private address space.   We only give out
real address space to customers that have servers that need to be
visible.   We run NAT on several customer facing routers.

Cool stuff we can do is setup PPTP VPNs on the same router to give
people "access from home" to their LAN.  Same with L2TP/ILEC DSL.

Problems include:

We have a big nat pool on each router.  If some twerp customer gets
infected with some windoze crap, tracking it down can be a bit more

Until recently, the IOS could not take huge volumes of NAT without
tossing it's cookies from time to time.

We have been toying around with VRFs & NAT which was recently introduced
in the IOS, and it appears that in a NAT situation, the VRFs "leak"
between each other, which scares the crap out of me.  We are going to
wait for a couple of revisions of the IOS before looking into that


"Christopher J. Wolff" wrote:


I would like to know if any service providers have built their access
networks out using private IP space.  It certainly would benefit the
global IP pool but it may adversely affect users with special
applications.  At any rate, it sounds like good fodder for a debate.

Christopher J. Wolff, VP CIO
Broadband Laboratories, Inc.

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