nanog mailing list archives

Re: SYN spoofing


From: woods () most weird com (Greg A. Woods)
Date: Wed, 28 Jul 1999 13:31:51 -0400 (EDT)


[ On Wednesday, July 28, 1999 at 11:21:35 (-0400), Daniel Senie wrote: ]
Subject: Re: SYN spoofing

I suspect most deployed routers do at least some filtering of packets on
most or all interefaces. In the past, some routers couldn't do these
lookups efficiently on source addresses, but that's really an
implementation issue. It's *possible* to design hardware that can handle
it, if there's a business case for doing so. ISPs should be interested
in doing such filtering.

In fact it's easy to buy off-the-shelf hardware today that can do
wire-speed filtering, assuming one has worked such costs into the budget
of building a network backbone....

-- 
                                                        Greg A. Woods

+1 416 218-0098      VE3TCP      <gwoods () acm org>      <robohack!woods>
Planix, Inc. <woods () planix com>; Secrets of the Weird <woods () weird com>



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