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Re: URPF on small BGP-enabled customers?
On Jun 3, 2005, at 10:52 AM, Christopher L. Morrow wrote:
It is.On Fri, 3 Jun 2005, Patrick W. Gilmore wrote:or perhaps 'no-advertise' and send the same length prefixes everywhere...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$
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.