[c-nsp] need good recommendation for isp gateway nat bgp pbr

[Mark Tinka]

On Friday, May 27, 2011 10:31:52 PM Brian Roche wrote:

> Ha, well... since you've pretty much convinced me my
> network is poorly designed by using NAT at all, I
> realize that even though I don't own enough IPv4 for my
> existing NAT customers, I suppose I could obtain
> addresses from my upstream providers and use them for my
> residential customers.  I've avoided using addresses I
> don't own for statically addressed customers (it makes
> it incredibly hard to change upstream providers if you
> are married to their IP allocation) but most of the
> residential customers are DHCP so re-addressing them
> would be comparatively easy.

This is assuming your upstream are willing to spare you a 
couple of chunks of their space for your own customer use, 
even when they may be pressed into a corner at that point in 
time.

Well, you've obviously considered the risks with going this 
method, so you certainly know what you're doing. And I think 
we should expect a similar trend like this among other ISP's 
the world over, as IPv4 becomes more and more scarce.

But the day your upstreams are unable to offer you anymore 
IPv4 addresses, your only choice will be to turn-up 
customers using IPv6. This is where you'll need to look at 
NAT(64) to allow your IPv6-only customers to access IPv4-
only networks on the Internet. Sadly, there's no workaround 
for this.

Cheers,

Mark.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 836 bytes
Desc: This is a digitally signed message part.
URL: <https://puck.nether.net/pipermail/cisco-nsp/attachments/20110527/f57382d9/attachment.pgp>