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Re: BCP38 For BGP Customers
From: Jared Mauch <jared () puck nether net>
Date: Thu, 10 Nov 2022 18:13:50 -0500
On Thu, Nov 10, 2022 at 10:27:02AM -0800, William Herrin wrote:
On Thu, Nov 10, 2022 at 10:08 AM Grant Taylor via NANOG <nanog () nanog org> wrote:I wonder if Feasible Path uRPF or Enhanced Feasible Path uRPF might help the situation. However I suspect they both suffer from the FIB != RIB problem and associated signaling.Hi Grant, That's a fairly good way to think about it. BGP knows -a- path and sometimes it knows more than one but it simply doesn't have signal on the totality of feasible paths for a particular IP address. No distance-vector protocol can.
There's more than this going on as well, because there's a number of other things going on, the IETF has created a SAVNET working group to see if it's possible to do something here, and there's also work in the SIDROPS WG that isn't yet adopted but may be. The intent would be to include things like the ASPA work with the SIDR/RPKI work to permit a proof to exist for SAV purposes. This may not include all the p2p IP space that would exist between the networks, and if one doesn't publish ASPA data for things like all those cloud on-ramp type services, you may end up with traffic blackholed or other side-effects. Simply put, SAV/BCP-38 et al is hard, and nearly impossible when you get much further away from the subnet that traffic originates from. - Jared -- Jared Mauch | pgp key available via finger from jared () puck nether net clue++; | http://puck.nether.net/~jared/ My statements are only mine.
Current thread:
- Re: BCP38 For BGP Customers, (continued)
- Re: BCP38 For BGP Customers Douglas Fischer (Nov 08)
- Re: BCP38 For BGP Customers Grant Taylor via NANOG (Nov 08)
- Re: BCP38 For BGP Customers William Herrin (Nov 08)
- Re: BCP38 For BGP Customers Mike Hammett (Nov 08)
- Re: BCP38 For BGP Customers William Herrin (Nov 08)
- RE: BCP38 For BGP Customers Adam Thompson (Nov 22)
- Re: BCP38 For BGP Customers Grant Taylor via NANOG (Nov 08)
- Re: BCP38 For BGP Customers William Herrin (Nov 08)
- Re: BCP38 For BGP Customers Grant Taylor via NANOG (Nov 10)
- Re: BCP38 For BGP Customers William Herrin (Nov 10)
- Re: BCP38 For BGP Customers Jared Mauch (Nov 10)
- Re: BCP38 For BGP Customers Grant Taylor via NANOG (Nov 08)
- Re: BCP38 For BGP Customers Douglas Fischer (Nov 08)
- Re: BCP38 For BGP Customers Matthew Petach (Nov 08)
- Re: BCP38 For BGP Customers Grant Taylor via NANOG (Nov 08)