From: Larry Roberts (groupstudy@american-hero.com)
Date: Mon Jul 18 2005 - 01:21:20 GMT-3
/24's tend to be the longest match for ISP's peering with customers.
ISP's *MAY* only accept /22 or /23's from peer ISPs unless explicitily
told otherwise. One of our connections fell into a case in with the ISP
I peered with had most of his connectivity through a single upstream
provider that would only accept /22's.
I could see my /24 in my ISP's route-server, but the upstream ISP was
filtering it. It took almost 2 weeks before things got fixed.
I really think your best bet in the real world is to stick with as-path
prepending.
If you look at the various route-servers on the internet, as-path seems
to be the most common, and hence most understood way of influencing traffic.
If you have the ability to vary your mask ( /22->/24 perhaps ) then that
would be a very effective method as longest match always wins (1).
Disclaimer (1) Someone , somewhere will have some method in which
longest match routing doesn't win. That method was excluded from the
above comment!
cciein2006@yahoo.com wrote:
> Almost forgot - how about using longer prefixes to influence inbound traffic?
> What is the success rate of that technique?
>
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