nanog mailing list archives

Re: Land and Cisco question


From: Dean Anderson <dean () av8 com>
Date: Mon, 24 Nov 1997 19:38:49 -0500

At 4:54 AM -0500 11/23/97, Alan Barrett wrote:
Randy Bush said:
for each interface on a router
  block tcp which is both to and from that interface

I don't think that's sufficient.  What about spoofed packets arriving via
interface A, with IP source and destination both set to the address of
interface B?

In this case the packets must eventually be transmitted via interface B and
Interface B transmit rules should take care of that.

                --Dean


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           Plain Aviation, Inc                  dean () av8 com
           LAN/WAN/UNIX/NT/TCPIP          http://www.av8.com
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