pxeboot with jumbo frame network

[Robert Blayzor]

On Jul 23, 2012, at 1:58 PM, Bob Healey wrote:
> I know I have this working, however I don't remember what I did.  I know I can pxeboot and install RHEL on a 9K frame network from a FreeBSD tftp server/NAT gateway.  I do know the first thing in my RHEL install script is to set the MTU to 9K.
> If I have a chance later today, I'll dig into one of my install servers and try to figure out what options I used with DHCP to get it working.


The trick is setting the boot time options on the client.  The server side (TFTP server) is the easy part as it's already setup and running.  But if the client boots and it's not jumbo frame enabled, TFTP will surely hang on getting the PXEboot as the server will be trying to send 9K UDP frames to a client that's probably defaulted to 1500.

If there is a DHCP option to set the client MTU, I've not found it anywhere.

-- 
Robert Blayzor
INOC, LLC
rblayzor at inoc.net
http://www.inoc.net/~rblayzor/