[cisco-bba] DSL+NAT Question

[Denny Reiter]

On Thu, Apr 28, 2005 at 09:26:20PM +0200, Imad Buhidma wrote:
> Hello
> 

> We are using Cisco 7206VXR (NPE-G1) with IOS version 12.2(15)T9
> as aggregation for DSL subscribers (approximately 10000 clients)
> and all subscribers will have private ip addresses, I would to know
> what is the recommended number of real ip addresses that we should
> use in NAT Pool to obtain good performance.
> 

We have a location we are trying to do this at now with only 6,000
subscribers.  My suggestion would be that unless you are an extreme
masochist, you give up now.  Every IOS load we've tried, including
both the one you are running and one specially built for us by Cisco
has failed spectacularly trying to do NAT.  And when the router
isn't busy writing crashinfo files, we are busy with customers that
have tickets open because the NAT/PAT has broken some aspect of
their Internet.

Denny