[c-nsp] Cisco IOS DHCP server && setting MTU size

[Robert Boyle]

At 05:15 PM 6/6/2006, Jerry Kemp wrote:
>In RTFM'ing, I have been reading Cisco's "Configuring the Cisco IOS 
>DHCP Server"
>   pdf manual, file name hipdhcps.pdf .  It appears that in the DHCP server
>configuration, you can set raw DHCP options, to include option 26, 
>which should
>set the MTU size when a system pulls a DHCP address.
>
>Is anyone doing this currently on the list?  Does this work well?  I 
>would think
>that anything would beat going around and manually changing registry 
>settings on
>a bunch of wintel boxes.

Just use:

interface fastethernet0
  ip tcp adjust-mss 1200

or whatever MSS you want to force. This will force the Windows boxes 
to use a smaller MTU without any changes to the registry. This will 
work with all machines without relying on DHCP either. You will need 
something pretty modern. 12.3 or better probably, but if you are 
already running PPPoE client and a 1760, you are probably already on 12.3(x).

-Robert



Tellurian Networks - The Ultimate Internet Connection
http://www.tellurian.com | 888-TELLURIAN | 973-300-9211
"Well done is better than well said." - Benjamin Franklin