North American Network Operators Group

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Re: SYN spoofing

  • From: Forrest W. Christian
  • Date: Wed Jul 28 21:41:31 1999

On Wed, 28 Jul 1999, Daniel Senie wrote:

> Cisco implemened a feature called "Unicast RPF" That disallows
> forwarding of packets on an interface where a reverse path is not
> present. The command to activate it is:
> 	ip verify unicast reverse-path

This only works if you have CEF turned on.   And...  Turning CEF on in a
4500 series router w/64mb ram & 2 BGP views just plain isn't good.

Now, if we could get CEF to only cache non BGP routes....

- Forrest W. Christian ([email protected]) KD7EHZ
iMach, Ltd., P.O. Box 5749, Helena, MT 59604
Solutions for your high-tech problems.                  (406)-442-6648