[systemd-devel] [RFT] DHCPv4 support in networkd

[Holger Schurig]

AFAIK Mac OSX does a trick here: it uses the last IP (still in the old
lease file) and immediately configures the network with that. *) Then
it does the DHCP, asking for the same IP. If the IP returned was
changed, it will re-change. But usually it's the same IP address, and
therefore on this OS DHCP doesn't take longer than static IP.

Strictly speaking the DHCP protocol is not violated that way: DHCP
itself works as expected, e.g. the DHCP packets are following the RFC.
And ip clients should copy with changed IP addresses anyway, because
DHCP can assign any IP address at renogiation time.


*) it might do an RARP to find out if the IP is available ...