Network interfaces

[Titus Winters]

I am running grub on a machine with several network interfaces, all of 
which have the same chipset on them (tulip.)  Is there a way for me
to choose which interface grub is going to listen to?  It currently 
chooses the wrong one for the network topology I am using (that is,
the TFTP server is on an interface that Grub is ignoring.)  

Any help would be greatly appreciated (even just telling me that I
have to write it myself.)

-Titus Winters

PS For a project I was working on a while ago I wrote a grub command
'netcommand' which made grub take input over UDP as if it was on
console.  It was really useful for making controllable networks
(sometimes I wanted to boot a kernel off the network, sometimes the
local one.)  Is it useful enough to bother submitting a patch?