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From: Charles Swiger <cswiger@mac.com>
Date: Mon, 13 Mar 2006 16:05:06 -0500
To: Sean Murphy <smurphy@calarts.edu>
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Cc: freebsd-questions@freebsd.org
Subject: Re: NIC and Jumbo Frames
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On Mar 13, 2006, at 2:57 PM, Sean Murphy wrote:
> How do I set Jumbo Frames on a Gigabit NIC in FreeBSD?

    ifconfig _device_ mtu 8192

...where you would use em0, bge0, or whatever the actual interface  
device is.
See the manpages for the various devices, for example "man em":

      Support for Jumbo Frames is provided via the interface MTU  
setting.
      Selecting an MTU larger than 1500 bytes with the ifconfig(8)  
utility con-
      figures the adapter to receive and transmit Jumbo Frames.  The  
maximum
      MTU size for Jumbo Frames is 16114.

...which usually will discuss the MTU sizes the specific devices can  
handle.

-- 
-Chuck