nanog mailing list archives
Re: BCP38 making it work, solving problems
From: "Christopher L. Morrow" <christopher.morrow () mci com>
Date: Tue, 12 Oct 2004 14:17:34 +0000 (GMT)
On Tue, 12 Oct 2004, Niels Bakker wrote:
* christopher.morrow () mci com (Christopher L. Morrow) [Tue 12 Oct 2004, 05:18 CEST]:a common occurance we've seen is a customer of a customer NOT announcing , nor planning on announcing, their routes to their upstream#1 which they use ONLY for outbound traffic (cheap transit for instance, and perhaps only for some portions of their total sources) though they announce to upstreams#2-N the proper sources to gather the return traffic. These things make uRPF 'difficult'.You could use uRPF-loose there, or the customer could do: ! route-map outbound-only permit 10 match prefix-list myprefixes set community no-export !
this does not address the problem, the customer's customer isn't announcing routes for this traffic so there is nothing to no-export :( Example: the 'chris.net' network is a customer of MCI, his customer "bakker.net". 'bakker.net' decides 'chris.net' has priced transit cheaply this year/month/day and choses not to accept traffic from 'chris.net' but send all outbound traffic through 'chris.net'. 'chris.net' never seens routes for the sources sending this traffic, yet passes it along to the upstream, which also has no routes for 'bakker.net' via 'chris.net'. Regardless, the point here is: "Things seem like they may be getting better, as 'security' requirements are now firmly being included into new equipment purchases."
Current thread:
- Re: BCP38 making it work, solving problems, (continued)
- Re: BCP38 making it work, solving problems Dan Hollis (Oct 10)
- Re: BCP38 making it work, solving problems Randy Bush (Oct 11)
- Re: BCP38 making it work, solving problems Edward B. Dreger (Oct 11)
- Re: BCP38 making it work, solving problems Richard A Steenbergen (Oct 11)
- Re: BCP38 making it work, solving problems Daniel Senie (Oct 11)
- Re: BCP38 making it work, solving problems Richard A Steenbergen (Oct 11)
- Re: BCP38 making it work, solving problems Daniel Senie (Oct 11)
- Re: BCP38 making it work, solving problems Suresh Ramasubramanian (Oct 11)
- Re: BCP38 making it work, solving problems Christopher L. Morrow (Oct 11)
- Re: BCP38 making it work, solving problems Niels Bakker (Oct 12)
- Re: BCP38 making it work, solving problems Christopher L. Morrow (Oct 12)
- Re: BCP38 making it work, solving problems Paul Vixie (Oct 12)
- Re: BCP38 making it work, solving problems alex (Oct 12)
- Re: BCP38 making it work, solving problems Steven Champeon (Oct 12)
- Re: BCP38 making it work, solving problems alex (Oct 12)
- Re: BCP38 making it work, solving problems Suresh Ramasubramanian (Oct 12)
- Re: BCP38 making it work, solving problems Steven Champeon (Oct 13)
- Re: BCP38 making it work, solving problems JP Velders (Oct 19)
- Re: BCP38 making it work, solving problems Fred Baker (Oct 19)
- Re: BCP38 making it work, solving problems Randy Bush (Oct 19)
- Re: BCP38 making it work, solving problems JP Velders (Oct 19)