nanog mailing list archives
Re: isprime DOS in progress
From: Graeme Fowler <graeme () graemef net>
Date: Wed, 21 Jan 2009 19:32:14 +0000
On Wed, 2009-01-21 at 12:27 -0500, Phil Rosenthal wrote:
Representing ISPrime here.
Well... representing myself and nobody else, so if that stretches my credibility thin so be it.
It's somewhat absurd to suggest that we are attacking our own nameservers, I assure you, we didn't spend many hours looking for your specific nameserver to start sending 10 requests per second for the root zone, and our nameservers serve many popular domains.
I just checked to make sure I did not make that assertion. I did not. I observed something odd, and stated as much to see if anyone else did. I apologise if you read my message as insinuating what you stated, but I assure you that wasn't the intention. I did say "maybe I'm being dumb", and that is indeed the answer - I applied a temporary netfilter ruleset, then made it permanent - and it switched the DROP and LOG statements round so that... the packet got dropped first and the log statements never got hit. Schoolboy error (and interesting that someone else has observed this behaviour before!)... Normal service has been resumed. I should write a haiku here (sorry, MLC, poor joke).
Given the attack is still in progress, I can't really say much more publicly, but suffice to say, we're working on the situation.
In a previous job I've been on the receiving end of similar attacks so I have a large degree of understanding of the pressure you're under at the moment. I wish you the best of luck sorting it out. Graeme
Current thread:
- Any ATT DNS admins out there? Mike Lyon (Jan 09)
- isprime DOS in progress Todd T. Fries (Jan 20)
- Re: isprime DOS in progress Graeme Fowler (Jan 21)
- Re: isprime DOS in progress Phil Rosenthal (Jan 21)
- Re: isprime DOS in progress Aaron Hopkins (Jan 21)
- Re: isprime DOS in progress Graeme Fowler (Jan 21)
- RE: isprime DOS in progress Justin Krejci (Jan 21)
- Re: isprime DOS in progress, and Re: DNS Amplification attack? Dale Carstensen (Jan 21)
- Re: isprime DOS in progress Graeme Fowler (Jan 21)
- Re: isprime DOS in progress Harald Koch (Jan 21)
- Re: isprime DOS in progress Bjørn Mork (Jan 22)
- Re: isprime DOS in progress Phil Rosenthal (Jan 23)
- RE: isprime DOS in progress Steven Lisson (Jan 23)
- Re: isprime DOS in progress Joe Abley (Jan 23)
- RE: isprime DOS in progress Luke Sheldrick (Jan 23)
- Re: isprime DOS in progress Chris McDonald (Jan 23)
- Re: isprime DOS in progress Noel Butler (Jan 23)
- isprime DOS in progress Todd T. Fries (Jan 20)