Using NAT for best-exit routing
jeffm at eonline.com
Fri Aug 28 17:53:28 UTC 1998
Brian Dickson wrote:
> such peer networks). Ingress traffic to the web farm provider has it's
> *source* address NAT'd, and internal routing points return traffic to
> the *same* NAT through which the request traffic came.
> Thus, return (data) traffic is best-exit.
> Side benefits are that the unique address pools allow for much easier
> per-peer and per-region collection of stats, eg netflow (at some place
> other than NATs).
As you point out, stats collection is easier--but only from a network ops
point of view, and even then, only if you're simply concerned with symmetric
flow of traffic to your upstreams/peers.
However, your web server logs are now useless, because all the requests come
from a static pool of local addresses. If you're a big web farm like Exodus,
your customers aren't going to buy this.
Manager, Systems/Network Engineering <jeffm at eonline.com>
150 Chestnut Street 415.772.3555 x4496
San Francisco, CA 94111 415.984.0322 FAX
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