onie discovery : DHCP IPv4 IP is unusable for the leased time

[Umakant-Patel]

Description

onie-discovery-start requests an IP from DHCP server, so that network OS images or other options can be downloaded from the files servers.

After network OS installation linux network manager DHCP requests sends mac+time as client id which is different than what onie -discovery-start sends as client id, resulting in IP obtained in onie discovery mode unusable.

Issue

Customer having huge number of devices upgrades to the new version of NOS through onie, resulting in DHCP pool running out of IP. considering lease time is considerably long.

Expectation

once network OS is installed onie should send a DHCPRELEASE to DHCP server. which can be obtained by adding (-R) option by default in the udhcpc arguments.