Merit Network
Can't find what you're looking for? Search the Mail Archives.
  About Merit   Services   Network   Resources & Support   Network Research   News   Events   Home

Discussion Communities: Merit Network Email List Archives

North American Network Operators Group

Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical

Re: BGP route flap damping

  • From: Kim Onnel
  • Date: Wed Jan 18 04:59:34 2006
  • Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:references; b=gkwkuqRYObs+hPoAEJdkypdvnKilOhAkF/jDwFtZ2Iwet9bHzewladP/xAaIfTODoRpq4B6HAuQ9R+CN80sGT6uKjfbHdojYYvIusMgNnpZwkz7b1Mos6Q736JNQtoB/Jm6LHWow3kcrvPnL3sE98HymorN3JU7JDP2uVP+IMbs=

Do this, configure and use blackhole routing with your upstream, this is how you stop an attack

How to detect it, use netflow.



On 1/16/06, Patrick W. Gilmore <patrick@ianai.net> wrote:

On Jan 16, 2006, at 8:48 AM, Gustavo Rodrigues Ramos wrote:

> Patrick W. Gilmore wrote:
>>
>> Not much you can do about this in general.  In your specific case,
>> since we don't know why your sessions died, we don't know what to
>> suggest to stop it.  Perhaps change the timers with your upstream?
>
> My BGP connections (and annoucements) with/to my ISPs are all fine.
>
> The problem takes place five or six AS far from me... Where I can't do
> much. I still can't reach some prefixes announced by large ISPs.
>
> At the first time, I thought an e-mail to the NOC of the network I
> can't
> reach can solve the problem, but it was a waste of time...

I'm a little confused.

Are you saying you dampened the prefixes of some other network?  If
so, it sounds like this is 100% in your control.

If the BGP sessions between you and your upstreams / peers never
flapped, no one should have dampened you.  (I can see it possibly
happening if someone else in the path between you and $OtherNetwork
is attacked and therefore flaps your routes, but that would affect a
lot of networks, not just you.)

--
TTFN,
patrick




Discussion Communities


About Merit | Services | Network | Resources & Support | Network Research
News | Events | Contact | Site Map | Merit Network Home


Merit Network, Inc.