[27902] in North American Network Operators' Group
Re: more-specifics in class B space?
daemon@ATHENA.MIT.EDU (Jeremy Porter)
Fri Mar 24 20:25:36 2000
Message-Id: <200003250123.TAA41693@freeside.fc.net>
To: Marc Slemko <marcs@znep.com>
Cc: nanog@merit.edu
In-reply-to: Your message of "Fri, 24 Mar 2000 17:58:41 MST."
<Pine.BSF.4.20.0003241745280.511-100000@alive.znep.com>
Date: Fri, 24 Mar 2000 19:23:28 -0600
From: Jeremy Porter <jerry@fc.net>
Errors-To: owner-nanog-outgoing@merit.edu
Looks like they have a routing registry to me:
whois -h rr.level3.net 63.211.112.0
% RIPEdb(3.0.0a13) with ISI RPSL extensions
route: 63.211.112.0/24
descr: /24 for Wayport POP
origin: AS14654
mnt-by: WAYPORT-MNT
changed: noc@wayport.net 20000322
source: LEVEL3
Why the bogus route, I don't know.
Although this is pretty good:
whois -h rr.level3.net 63.0.0.0
% RIPEdb(3.0.0a13) with ISI RPSL extensions
route: 63.0.0.0/13
descr: UUNET, An MCI Worldcom Company
3060 Williams Drive
Fairfax
VA 22031 USA
origin: AS701
mnt-by: MAINT-AS701
changed: juzer@UU.NET 19981110
source: RADB
In message <Pine.BSF.4.20.0003241745280.511-100000@alive.znep.com>, 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 63.0.0.0/8, version 5217053
>Paths: (14 available, no best path)
> Not advertised to any peer
> 10764 5646 1239 3356 3356 3356 (history entry)
> 206.220.240.223 from 206.220.240.223 (206.220.240.223)
> Origin IGP, localpref 100, external
> Dampinfo: penalty 464, flapped 1 times in 00:17:10
> 5056 3561 3356 (history entry)
> 167.142.3.6 from 167.142.3.6 (167.142.3.6)
> Origin IGP, localpref 100, external
> Dampinfo: penalty 467, flapped 1 times in 00:17:00
> 267 1225 1325 1673 701 3356 (history entry)
> 204.42.253.253 from 204.42.253.253 (204.42.253.253)
> 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)
> 192.121.154.25 from 192.121.154.25 (192.121.154.25)
> Origin IGP, localpref 100, external
> Dampinfo: penalty 469, flapped 1 times in 00:16:50
> 293 1800 1239 3356 3356 3356 (history entry)
> 134.55.24.6 from 134.55.24.6 (134.55.20.229)
> 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.
>
>
--- jerry@fc.net
Director Network Operations/Network Engineering, Wayport, Inc.
512-519-6193 www.wayport.net
8303 Mopac Expressway Suite A300, Austin Tx.
