[c-nsp] Adjust mss on 6500

[Tim Stevenson]

Adjust mss requires that the CPU see TCP SYN packets so the 
adjustment can be made during the handshake. As such, it requires h/w 
programming of the ACL TCAM to do the redirection appropriately. The 
software support to do this is not in any shipping s/w for the 6500 
today, it is roadmapped for Q1CY07. (BTW, it is avail now in SRA 7600 code).

Of course, any time a feature brings the CPU into the fwding path, I 
urge you to understand the implications & use caution.

Tim

At 07:09 PM 10/16/2006 +0200, fredrik.jacobsson at seb.se commented:
>Hi all!
>
>We have a couple of 6500's doing alot of encrypted GRE-tunnels.
>IOS is 12.2(18)SXD7a
>
>I'm trying to set this command on a tunnel interface:
>ip tcp adjust-mss 1400
>
>But:
>XXXXXXXX(config-if)#ip tcp adjust-mss 1400
>                            ^
>% Invalid input detected at '^' marker.
>
>XXXXXXXX(config-if)#ip tcp ?
>   compression-connections  Maximum number of compressed connections
>   header-compression       Enable TCP header compression
>
>
>Is there another way to do that?
>(Can't understand why it doesn't have the ajust-mss feature)
>
>Best regards
>/Fredrik Jacobsson
>
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Tim Stevenson, tstevens at cisco.com
Routing & Switching CCIE #5561
Technical Marketing Engineer, Catalyst 6500
Cisco Systems, http://www.cisco.com
IP Phone: 408-526-6759
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