Re: [c-nsp] GRE router recommendations

2007-04-21 Thread Simon Lockhart
On Fri Apr 20, 2007 at 11:14:16PM +0200, Asbjorn Hojmark - Lists wrote:
  At the sites where I need to tunnel from are currently 3550 
  switches (and a few 3750's). What sort of GRE performance
  should I see from those?
 
 GRE is not supported on the small Catalyst switches. It does
 work (in some versions?) but only at low performance and with
 high CPU utilization... And, again, it's not supported.

Yeah - I've since found that on the Cisco website.

But, what about GRE performance on true routers?

Simon
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Re: [c-nsp] GRE router recommendations

2007-04-21 Thread Brett Frankenberger
On Sat, Apr 21, 2007 at 02:32:22PM +0200, Gert Doering wrote:
 
 7600/Sup720 will do whatever you need, provided you use a different local
 address for each tunnel source (if you have multiple tunnels on the
 same local IP address, the hardware can't do the tunneling, and the CPU 
 is much slower).

But it won't verify the source address on GRE packets it receives,
which makes it feasible to forge GRE packets without forging the source
address, which in some configurations makes some attacks easier.  That
relevant in some situations and not in others ...

 -- Brett
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