Have there been any changes in the FOS kernel that would affect how UDHCPC operates, or how long it waits for a DHCP lease?
We’re on kernel 4.7.1
Sorry to pop this bubble… Due to communication issues, I thought PortFast was turned off for this case. I’ve found out that PortFast was in fact turned on.
It seems that this change would only affect certain switches with certain configurations - with portfast being off. I think older switches would perhaps work but newer ones won’t, too fast of a CPU in them. That’s what I’m seeing right now.
I feel like a middle man.
Tom says - the kernel loads the NIC as part of the kernel loadup now.
The difference - the time the nic is down is way, way shorter. So short, the switches apparently don’t even notice. So you can get away with portfast being off.
Just spoke with @Tom-Elliott
He now takes the IP that iPXE gets from DHCP, and passes it as a kernel argument - and the latest FOG kernel 4.7.1 accepts this IP and uses it. So if the IP is already configured in the kernel, UDHCPC doesn’t need to get a new IP - but it still gets DNS addresses. If for whatever reason the kernel doesn’t get passed an IP, UDHCPC will request one. It operates as a sort of failsafe now.
This also means the latest kernel should work with 1.2.0 in theory - no promises.
Also - This change allows FOG to work with PortFast turned OFF. Yes, you heard me right. Tested working at work.
The 4.7.1 kernels actually have IP loading back as a default part of the kernel load up (meaning 4.7.1 and up should work again for 1.2.0 and earlier too).