Re: Quick BGP peering question

[Jeff Aitken <jaitken () aitken com>]

On Wed, Jan 03, 2007 at 01:36:26PM +0000, James Blessing wrote:
> Expecting the traffic is not a problem, just want some way of verifying 
> that the traffic isn't malicious/spoofed (e.g. by using unicast RPF or
> similar)

Whether or not the customer plans on advertising prefixes via BGP, 
your standard contract/AUP should contain a provision that:

(a) requires that the customer provide a list of IP blocks from which
traffic may be sourced, and

(b) allows you to drop any packets with a source IP not in the list.


The mechanism you use to keep track of this info (post-it notes, 
email, automated route-registry system, etc.) may be subject to
negotiation, but the underlying requirement should not be.  

Ideally, you'd keep all this in a database and auto-generate BOTH
prefix filters (for the BGP session) AND packet filters (for the
interface) every time the customer registered a new route.


--Jeff