nanog mailing list archives
Re: Who does source address validation? (was Re: what's that smell?)
From: Jeff Aitken <jaitken () aitken com>
Date: Tue, 8 Oct 2002 12:09:56 -0400
On Tue, Oct 08, 2002 at 11:49:41AM -0400, Jared Mauch wrote:
Of course, this is the IP RIB and may not include all the potential paths in the BGP Adj-RIBs-In, right? As such, you've still got the potential for asymmetric routing to break things.No, this is "if i have a path in fib" back to this source, transmit else drop;
Unless I'm missing something, that's what he said; fib == loc-rib for the purposes of this discussion, and loc-rib is built from the various adj-ribs-in. That said, I'm curious to know how asymmetric routing can break this. As long as someone is sending (and you are installing) a prefix that includes the source address this check will pass. If you don't have a route back to the source at all, that isn't asymmetric routing, it's network partitioning, assuming the source is legitimate. --Jeff
Current thread:
- Re: Who does source address validation? (was Re: what's that smell?) Danny McPherson (Oct 08)
- <Possible follow-ups>
- Re: Who does source address validation? (was Re: what's that smell?) Danny McPherson (Oct 08)
- Re: Who does source address validation? (was Re: what's that smell?) Jared Mauch (Oct 08)
- Re: Who does source address validation? (was Re: what's that smell?) Jeff Aitken (Oct 08)
- Re: Who does source address validation? (was Re: what's that smell?) Jared Mauch (Oct 08)
- Re: Who does source address validation? (was Re: what's that smell?) Jared Mauch (Oct 08)
- Re: Who does source address validation? (was Re: what's that smell?) Valdis . Kletnieks (Oct 08)
- Re: Who does source address validation? (was Re: what's that smell?) Danny McPherson (Oct 08)
- Re: Who does source address validation? (was Re: what's that smell?) Jared Mauch (Oct 08)
- Re: Who does source address validation? (was Re: what's that smell?) Iljitsch van Beijnum (Oct 08)
- Re: Who does source address validation? (was Re: what's that smell?) Danny McPherson (Oct 08)
- Re: Who does source address validation? (was Re: what's that smell?) Stephen J. Wilcox (Oct 09)
- Re: Who does source address validation? (was Re: what's that smell?) Joe Abley (Oct 09)
- Re: Who does source address validation? (was Re: what's that smell?) David Schwartz (Oct 09)
- Re: Who does source address validation? (was Re: what's that smell?) Stephen Stuart (Oct 09)
- Re: Who does source address validation? (was Re: what's that smell?) Joe Abley (Oct 09)