dhcpcd testing

[Joerg Sonnenberger <joerg%britannica.bec.de@localhost>]

Hi all,
I've just committed the update of dhcpcd to 4.0.0rc3.

This version now includes link state control support, so
if you unplug your cable and plug it back into a difference network [or
your WLAN changed], it will automatically verify that the lease is still
usable and obtain a new one otherwise.

This functionality of course requires support in the network driver and
e.g. bge(4) had some issues with this until recently. There is a known
issue that wpa-enabled wireless sends the UP message too early, so if
the authentication can take very long, DHCP may fail.

Please give it a try and report any problems with both the client itself
and network cards.

You can enable dhcpcd either by starting it explictly via "dhcpcd $nic"
or by setting ifconfig_$nic=dhcp in /etc/rc.conf. One handy option to
set is dhcpcd_flags="-b -q", so that it will not wait at all.

Joerg