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Re: URPF on small BGP-enabled customers?

  • From: Patrick W. Gilmore
  • Date: Fri Jun 03 11:08:26 2005

On Jun 3, 2005, at 10:52 AM, Christopher L. Morrow wrote:

On Fri, 3 Jun 2005, Patrick W. Gilmore wrote:

Perhaps a simpler way is to announce your entire allocation and put
no-export on things you want to come in your other provider?  ^1239$
or perhaps 'no-advertise' and send the same length prefixes everywhere...
this IS headed down the 1000 ways to config bgp though :(
It is.

Although, after reading the thread (here & on c-nsp) and thinking about it, I have a hypothesis:

Sprint configures inbound source IP filters based on BGP filters. This could be automated easily. (BGP Tech: "What prefixes are you going to announce to us?" type-type-type.... System pushes prefix and IP ACLs.) Sound reasonable? Anyone from Sprint care to confirm?

So even if you do not plan to announce all prefixes to Sprint, give them all prefixes so you can announce them, and the IP ACLs will be built properly.