NIC and Jumbo Frames

[Sean Murphy]

Charles Swiger wrote:
> 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
>
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What do I need to add to the rc.conf config line so that it sets up the 
mtu for jumbo 16128 bytes size and sets the speed from auto to 1000?  I 
have this so far...

ifconfig_em0="inet x.x.x.x  netmask x.x.x.x 1000baseTX"