Hijacked Network Ranges

Jonathan Lassoff jof at thejof.com
Tue Jan 31 12:27:28 CST 2012


On Tue, Jan 31, 2012 at 10:19 AM, Grant Ridder <shortdudey123 at gmail.com> wrote:
> Hi,
>
> What is keeping you from advertising a more specific route (i.e /25's)?

Most large transits and NSPs filter out prefixes more specific than a /24.

Conventionally, at least in my experience, /24's are the most-specific
prefix you can use and expect that it will end up in most places.
Some shops with limited router processing or table storage capacity
will filter even more restrictively, so a bigger aggregate is worth
announcing as well.

Cheers,
jof



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