[73585] in North American Network Operators' Group
RE: Best Practices for Enterprise networks
daemon@ATHENA.MIT.EDU (Fergie (Paul Ferguson))
Sun Aug 29 20:52:47 2004
From: "Fergie (Paul Ferguson)" <fergdawg@netzero.net>
Date: Mon, 30 Aug 2004 00:50:39 GMT
To: michel@arneill-py.sacramento.ca.us
Cc: iljitsch@muada.com, TSmith@illinois.net, nanog@merit.edu
Errors-To: owner-nanog-outgoing@merit.edu
Of course it can work. My point is that it is a fact of life,
nothing more.
Pointing out the obvious: Dependent upon who is/are your upstream
provider(s), and how specific the prefix announcements are made
to their peers (re: your reachability) determines just how symmetric
your traffic patterns will be.
- ferg
-- "Michel Py" <michel@arneill-py.sacramento.ca.us> wrote:
> Asymmetric paths are a fact of life in the Internet.
Not for enterprise operators except the largest ones. Asymmetric traffic
does happen in the core, where there are no firewalls or NATs; as far as
the edge is concerned though I know several companies that multihome to
two or more ISPs but only in one location, largely because they don't
want to deal with NAT/firewall issues. Although it can work, it requires
extra engineering and most of the time a fat pipe to replicate state
information between the sites.
--
"Fergie", a.k.a. Paul Ferguson
Engineering Architecture for the Internet
fergdawg@netzero.net or
fergdawg@sbcglobal.net
