nanog mailing list archives

Re: Real-Time Mitigation of Denial of Service Attacks Now Available With AT&T


From: "Christopher L. Morrow" <christopher.morrow () mci com>
Date: Thu, 03 Jun 2004 15:25:11 +0000 (GMT)



On Thu, 3 Jun 2004, Erik Haagsman wrote:


On Wed, 2004-06-02 at 19:32, Jeff Aitken wrote:
On Wed, Jun 02, 2004 at 06:00:38PM +0200, Erik Haagsman wrote:
Only very small ISPs relying on 36xx's or multilayer switching instead
of larger, more powerful might be still valid cases where ACL's are a
problem.

Interesting assertion.  Care to support it?

It's not unusual for smaller ISP's and small hosting companies to rely
on low-spec equipment that can just deal with normal traffic flows, but
start falling apart when a traffic spike hits and access lists are
present. As an example, take a lower end IronCore Foudry switch with a

Or, look at some examples in the 6500 family even, not really a 'low end'
switch, but still able to fail spectacularly under abnormal conditions.
(provided you don't have super new Sup720 and other wizz-bang-foo hot off
the presses)

-Chris


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