[syslinux] dhcprelease in pxelinux

[H. Peter Anvin]

Rajeev Agrawala wrote:
> Can you please point me to RFC and relevant section regarding this. I am 
> in a situation where all machines boot using PXE but after local boot 
> switch to static IP address and I don't have enough dynamic address on 
> subnet to reboot all the machines.

DHCPRELEASE means "I'm done with this address, permanently" which might 
be correct in your case but your configuration definitely is in the 
minority.  In fact, for people using ipappend it is not just discouraged 
but actively wrong.

It would definitely be better if you could get your DHCP server to 
service the public addresses; if not, I would suggest having the OS send 
DHCPRELEASE at OS boot time (typically before configuring the static 
address) by going though a DHCP request-release cycle; dhclient can do 
this, for example (dhclient -1 && dhclient -r).

	-hpa