routing to 147.73/16

Linda Winkler lwinkler at anl.gov
Wed Nov 19 16:39:26 UTC 1997


At SC97, we saw 147.73/16 injected into the vBNS yesterday by DREN.
this caused vBNS sites to traverse the vBNS to SDSC then hop to DREN
to get to SJCC while the vBNS/NTON link into SJ was being worked on.  
this was quite unexpected.
lw

At 08:25 AM 11/19/97 -0800, Ron Broersma wrote:
>Phil,
>
>The subnets you are receiving via your BGP session with DREN support the
DoD  
>HPCMP portions of the net at SC97.  There is a DREN connection to SC97 to  
>support the demonstrations.  Therefore you should reach the DoD HPCMP  
>resources at SC97 via your DREN connection, and the rest of your SC97
traffic  
>should follow the less explicit 147.73/16 path.  DREN is not announcing  
>these subnets to other peers at the exchanges, only to DREN members.
>
>Meanwhile, in response to your message, Tom Kile installed a filter at PLK  
>so you should no longer receive these prefixes via DREN.
>
>--Ron
>
>Begin forwarded message:
>
>To: nanog at merit.edu
>Subject: routing to 147.73/16
>Date: Mon, 17 Nov 1997 13:04:07 -0700
>From: Phil Wood <cpw at lanl.gov>
>Sender: owner-nanog at merit.edu
>
>
>Folks,
>
>If any of you BGP peer with DREN, as we do, you will be getting
>(as part of their AS668) a couple of subnets of 147.73/16:
>
>B    147.240.0.0/16 [5/0] via 138.18.169.1, 01:44:58
>     147.73.0.0/16 is variably subnetted, 2 subnets, 2
>  B       147.73.234.0/28 [5/0] via 138.18.169.1, 01:40:24
>  B       147.73.234.128/27 [5/0] via 138.18.169.1, 01:39:54
>
>This could cause customers visiting SC97 to complain about
>connectivity to their local network from SC97 unless you are also
>receiving routing for the remaining 147.73 space from some other
>peer.
>
>I thought some subset of the nanog population might want to know
>since it caused me a bit of trouble shooting this morning, and nobody
>at DREN is available.
>
>Phil
>
>



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