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Re: more-specifics in class B space?
Looks like they have a routing registry to me: whois -h rr.level3.net 220.127.116.11 % RIPEdb(3.0.0a13) with ISI RPSL extensions route: 18.104.22.168/24 descr: /24 for Wayport POP origin: AS14654 mnt-by: WAYPORT-MNT changed: [email protected] 20000322 source: LEVEL3 Why the bogus route, I don't know. Although this is pretty good: whois -h rr.level3.net 22.214.171.124 % RIPEdb(3.0.0a13) with ISI RPSL extensions route: 126.96.36.199/13 descr: UUNET, An MCI Worldcom Company 3060 Williams Drive Fairfax VA 22031 USA origin: AS701 mnt-by: MAINT-AS701 changed: [email protected] 19981110 source: RADB In message <[email protected]>, Marc Slemko writes: > >Cute. So, further to this, I noticed that AS3356 (level3.net) was >advertising a route for 63/8, on and off. Doesn't seem to be advertised >right now, but it comes and goes. Example history entry from a couple of >minutes ago: > >BGP routing table entry for 188.8.131.52/8, version 5217053 >Paths: (14 available, no best path) > Not advertised to any peer > 10764 5646 1239 3356 3356 3356 (history entry) > 184.108.40.206 from 220.127.116.11 (18.104.22.168) > Origin IGP, localpref 100, external > Dampinfo: penalty 464, flapped 1 times in 00:17:10 > 5056 3561 3356 (history entry) > 22.214.171.124 from 126.96.36.199 (188.8.131.52) > Origin IGP, localpref 100, external > Dampinfo: penalty 467, flapped 1 times in 00:17:00 > 267 1225 1325 1673 701 3356 (history entry) > 184.108.40.206 from 220.127.116.11 (18.104.22.168) > Origin IGP, localpref 100, external > Community: 267:1225 1225:80 1225:1325 > Dampinfo: penalty 732, flapped 2 times in 00:17:08 > 1755 1800 1239 3356 3356 3356 (history entry) > 22.214.171.124 from 126.96.36.199 (188.8.131.52) > Origin IGP, localpref 100, external > Dampinfo: penalty 469, flapped 1 times in 00:16:50 > 293 1800 1239 3356 3356 3356 (history entry) > 184.108.40.206 from 220.127.116.11 (18.104.22.168) > Origin IGP, localpref 100, external > Dampinfo: penalty 458, flapped 1 times in 00:17:24 > 1849 702 701 3356 (history entry) >[...] > >Why are they doing this? Who knows, they don't respond to email. But I >notice that they are advertising a whole bunch of /24s, /23s, and other >sub /20 blocks under 63/8. What a great solution; "hey, people can't >reach us because we are advertising bogusly small blocks, so lets just >advertise an aggregate for the whole /8 to make sure everyone listens to >it". Riiiiiiiiight. > >The concept (ie. advertise an aggregate, even if it doesn't go to exactly >the right place, then also advertise more specifics; if someone filters >the more specifics, the aggregate will serve to get traffic to a network >that does listen to the more specifics) does often work as long as your >network topography is simple enough, it sure doesn't cut down on route >bloat. > >Insert standard rant about having a clue before advertising routes, not >advertising bogusly small blocks, routing registries, etc. > > --- [email protected] Director Network Operations/Network Engineering, Wayport, Inc. 512-519-6193 www.wayport.net 8303 Mopac Expressway Suite A300, Austin Tx.