nanog mailing list archives
Re: "Tactical" /24 announcements
From: Hank Nussbacher <hank () interall co il>
Date: Mon, 9 Aug 2021 20:31:57 +0300
On 09/08/2021 18:47, Billy Croan wrote:
How does the community feel about using /24 originations in BGP as a tactical advantage against potential bgp hijackers? All of our allocations are larger and those prefixes we announce for clients as well usually are. But we had a request recently to originate everything as distinct /24 prefixes, to reduce the effect of a potential bgp hijack. It seemed a little bit like a tragedy of the commons situation. Is this seen as route table pollution, or a necessary evil in today's world? How many routers out there today would be affected if everyone did this? Are there any big networks that drop or penalize announcements like this?
In addition to what everyone else said, announcing /24s will not help you one bit since ASNs announce /25s, /26s, /27s, etc. Attached is a 7800+ line text file sorted by ASN with prefixes being announced that are more specific than /24 (only /25+/26+/27 listed).
This is based on http://www.ris.ripe.net/dumps/riswhoisdump.IPv4.gz from about a month ago.
That dump lists all the IPv4 prefixes seen in the collective of latest RIS table dumps, together with origin AS and number of peers that passed the routes to RIS.
So good luck with announcing /24s. Regards, Hank
Attachment:
more-specifics-sorted-by-asn.7z
Description:
Current thread:
- Re: "Tactical" /24 announcements, (continued)
- Re: "Tactical" /24 announcements Martijn Schmidt via NANOG (Aug 09)
- Re: "Tactical" /24 announcements Saku Ytti (Aug 09)
- Re: "Tactical" /24 announcements William Herrin (Aug 09)
- Re: "Tactical" /24 announcements Masataka Ohta (Aug 09)
- Re: "Tactical" /24 announcements William Herrin (Aug 09)
- Re: "Tactical" /24 announcements Sabri Berisha (Aug 09)
- Re: "Tactical" /24 announcements William Herrin (Aug 09)
- Re: "Tactical" /24 announcements Masataka Ohta (Aug 10)
- Re: "Tactical" /24 announcements Masataka Ohta (Aug 09)
- Re: "Tactical" /24 announcements Amir Herzberg (Aug 09)
- Re: "Tactical" /24 announcements Martijn Schmidt via NANOG (Aug 09)
- Re: "Tactical" /24 announcements Adam Thompson (Aug 09)
- Re: "Tactical" /24 announcements Hank Nussbacher (Aug 09)
- Re: "Tactical" /24 announcements Tom Beecher (Aug 09)
- Re: "Tactical" /24 announcements Rabbi Rob Thomas (Aug 09)
- Re: "Tactical" /24 announcements Mark Tinka (Aug 10)
- Re: "Tactical" /24 announcements Tom Hill (Aug 11)
- Re: "Tactical" /24 announcements Mark Tinka (Aug 11)
- Re: "Tactical" /24 announcements Tom Beecher (Aug 09)
- Re: "Tactical" /24 announcements Baldur Norddahl (Aug 09)
- Re: "Tactical" /24 announcements Robert McKay (Aug 09)
- Re: "Tactical" /24 announcements Lady Benjamin Cannon of Glencoe, ASCE (Aug 09)