[132472] in North American Network Operators' Group
RE: Cogent announcing more specific prefixes?
daemon@ATHENA.MIT.EDU (Knight, Brian)
Thu Nov 25 23:54:18 2010
Date: Thu, 25 Nov 2010 23:54:08 -0500
In-Reply-To: <4CEEE265.1040203@kenweb.org>
From: "Knight, Brian" <Brian.Knight@us.mizuho-sc.com>
To: <ml@kenweb.org>,
<nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
We received Cyclops alerts for one of our /24's=2E It claimed that the pre=
fix=0D=0Awas being announced by a provider in Hong Kong=2E Our alerts fire=
d between=0D=0A10:36:30 and 10:40:36 UTC today, 2010-11-25=2E The longest =
time period that=0D=0Aany alert was active was 2m 58s=2E=0D=0A=0D=0AAll app=
ears to be well at this moment; the prefix is not being announced by=0D=0At=
hat provider according to routeviews=2Eorg=2E=0D=0A=0D=0AIt is highly unusu=
al for us to receive alerts=2E We have only 5x /24 networks=0D=0Abeing mon=
itored=2E Given that you received similar alerts less than 1=2E5 hr=0D=0Al=
ater, I wonder if this was a systemic problem=2E=0D=0A=0D=0A=0D=0A-Brian Kn=
ight =0D=0ASr=2E Network Engineer =0D=0AMizuho Securities USA Inc=0D=0Ahttp=
://www=2Emizuho-sc=2Ecom/ =0D=0A=0D=0A* Please note that all NANOG list mem=
bers and archive readers may consider=0D=0Athemselves Recipients of this me=
ssage, in reference to the appended=0D=0Adisclaimer=2E (I don't add it mys=
elf and can't control it, sorry=2E)=0D=0A=0D=0A=0D=0A=0D=0A> -----Original =
Message-----=0D=0A> From: ML [mailto:ml@kenweb=2Eorg] =0D=0A> Sent: Thursda=
y, November 25, 2010 4:26 PM=0D=0A> To: nanog@nanog=2Eorg=0D=0A> Subject: C=
ogent announcing more specific prefixes?=0D=0A> =0D=0A> Anyone else get ale=
rts from their BGP monitoring system (In my case=0D=0A> Cyclops) saying Cog=
ent briefly announced some more specific prefixes?=0D=0A> =0D=0A> AS path a=
s reported by Cyclops: 7575 46135 174 174=0D=0A> =0D=0A> /20s broken into /=
23s=0D=0A> /23s became /24s=0D=0A> =0D=0A> Also saw alerts for one to one (=
/23 announced has /23)=0D=0A> =0D=0A> All alerts had a timestamp of: 2010-1=
1-25 12:01:12 UTC=0D=0ACONFIDENTIAL: This e-mail, including its contents an=
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