nanog mailing list archives
Re: Re[2]: SYN floods (was: does history repeat itself?)
From: Alexis Rosen <alexis () panix com>
Date: Tue, 10 Sep 1996 14:21:20 -0400 (EDT)
Alec H. Peterson writes:
Alexis Rosen writes:That's why I was talking about filtering at a router just upstream from the dial-access box. FWIW, even with a thousand very busy modems, I'm pretty sure that even a small cisco is up to the job. They just don't generate all that much traffic.Could be, although I'd want to see this before I bet the farm on it. I'm not sure how efficient crisco's filtering algorithm is...
I would. As a point of reference, we have filters on two fairly busy T1s, which between them account for more then 500 modems worth of traffic and a *lot* more besides (all of VTW's traffic, for example). Putting filters on these, both an an AGS+/4, didn't make an enormous difference in CPU- it's still <30%. Surely a 2500 series box could handle that much. (It's 68030 vs. 68040, but we're at 30% utilization, and we're doing other things on that box.) /a --- Alexis Rosen Owner/Sysadmin, PANIX Public Access Unix & Internet, NYC. alexis () panix com - - - - - - - - - - - - - - - - -
Current thread:
- Re[2]: SYN floods (was: does history repeat itself?) Pat Calhoun (Sep 09)
- Re: Re[2]: SYN floods (was: does history repeat itself?) Alec H. Peterson (Sep 10)
- Re: Re[2]: SYN floods (was: does history repeat itself?) Alexis Rosen (Sep 10)
- Re: Re[2]: SYN floods (was: does history repeat itself?) Alec H. Peterson (Sep 10)
- Re: Re[2]: SYN floods (was: does history repeat itself?) Alexis Rosen (Sep 10)
- Message not available
- Re: Re[2]: SYN floods (was: does history repeat itself?) Sharif Torpis (Sep 10)
- Re: Re[2]: SYN floods (was: does history repeat itself?) Alec H. Peterson (Sep 10)
- Re: Re[2]: SYN floods (was: does history repeat itself?) Alexis Rosen (Sep 10)
- Re: Re[2]: SYN floods (was: does history repeat itself?) Alec H. Peterson (Sep 10)
- Re: Re[2]: SYN floods (was: does history repeat itself?) John G. Scudder (Sep 12)
- Re: Re[2]: SYN floods (was: does history repeat itself?) Joel Gallun (Sep 12)
- Re: Re[2]: SYN floods (was: does history repeat itself?) Michael Dillon (Sep 12)
- Re: Re[2]: SYN floods (was: does history repeat itself?) Alex.Bligh (Sep 12)
- Re: Re[2]: SYN floods (was: does history repeat itself?) Neil J. McRae (Sep 13)
- <Possible follow-ups>
- Re: SYN floods (was: does history repeat itself?) Ben Tersian (Sep 09)
- Re: Re[2]: SYN floods (was: does history repeat itself?) Justin W. Newton (Sep 09)