[114655] in North American Network Operators' Group
Re: ISP best practices
daemon@ATHENA.MIT.EDU (Jon Lewis)
Thu May 21 10:00:24 2009
Date: Thu, 21 May 2009 10:00:09 -0400 (EDT)
From: Jon Lewis <jlewis@lewis.org>
To: Philip Lavine <source_route@yahoo.com>
In-Reply-To: <408493.6724.qm@web30807.mail.mud.yahoo.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Thu, 21 May 2009, Philip Lavine wrote:
> I am sure this has been asked 10 to the 1 millionth power times, however
> may be the rules have changed. I am looking to set up a really small ISP
> with a few /24's. I want to host DNS as well. Is there any
> whitepapers/howtos/best practices on setting up multihomed BGP and DNS
> with BIND so I don't blow up the Internet.
A few minutes with google would probably find sample BGP multihoming
configs. The big things to avoid are unnecessary deaggregation and
announcing routes received from one provider to the other.
i.e. If you have a /22 of IP space, you may use/see that as 4 /24's or a
larger number of smaller subnets, but where eBGP is concerned, you should
announce just the /22 route and keep your subnetting to yourself.
If you have competent providers, they won't accept routes from you that
they're not expecting, which will stop you from offering transit to them
by announcing routes received from your other provider. Still, it's
better to get your config done right than rely on your providers to ignore
what you shouldn't be advertising.
----------------------------------------------------------------------
Jon Lewis | I route
Senior Network Engineer | therefore you are
Atlantic Net |
_________ http://www.lewis.org/~jlewis/pgp for PGP public key_________
