From: Weidong Xiao (Weidong.Xiao@active24.co.uk)
Date: Fri Sep 17 2004 - 07:04:01 GMT-3
1. Nanog may be the best list to seek help for this.
2. www.traceroute.org very helpful.
2. Can you advertise you ip range by smaller blocks? Say previously you
advertised one /19, now can you try to advertise two /20? It may or may not
work, because you upstream may consult RIPE-DB(in my cse) to decide wheather
to accept your routes.
HTH,
Weidong
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> Anthony Pace
> Sent: 16 September 2004 18:12
> To: ccielab@groupstudy.com
> Subject: OT: Black holes and BGP
>
>
> Does anyone know of a mechanism, or troubleshooting methodology for
> diagnosing a partial Internet Outage of INGRESS traffic?
>
> My network is multi-homed to 2 ISPs, which land on 2 separate routers
> (which come in on 2 different ILEC's physical media). Each of these
> routers peers with the respective ISP and each other. There is
> flexibility to allow some address blocks to be advertised so that the
> INGRESS traffic will arrive at one or the other ISP links
> (and PREPENDS
> to the other ISP create an alternate route.)
>
> This architecture is an automatic failover for loss of
> router, circuit,
> or BGP session, but does nothing to protect against one of
> the providers
> advertising one of our address blocks and "black holing" the traffic
> (due to an outage or whatever). The world will not take the alternate,
> longer AS-PATH route from the second provider so long as the "problem
> provider" is announcing a more attractive route.
>
> The solution requires a human intervention (once it is determined that
> "some" people can't reach the address space.) I know there
> are services
> that will monitor your Internet presence and notify you if
> parts of the
> world are not able to reach you. I know there are public
> route servers,
> which can be checked in the event a problem is suspected.
>
> Does anyone know of a mechanism or a methodology that can be used in
> such a scenario? I know there allot of smart people on this list and I
> bet some of you have dealt with this exact scenario.
>
> Sorry for the off topic post.
>
> Anthony Pace CCIE 10349
> --
> Anthony Pace
> anthonypace@fastmail.fm
>
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