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#
# Argh! dhclient in FreeBSD 5 has a new auto-background "feature",
# it dives into the background after 10 seconds regardless of whether
# it has received a response.  This is fubar for us.  Unfortunately,
# we cannot just crank this number through the roof because it is based
# on a polling interval which actually has a rational purpose.  The timeout
# is actually (2 * polling_interval) where polling_interval is how often
# dhclient rechecks an interface without link.  We need to keep this value
# reasonable in the event that we boot up and don't immediately have link
# on the control net.  So lets try 15 seconds (30 second auto-background
# timeout) and see how things go.
#

standard scripts.  The current FreeBSD 5 image uses this.

- have pump/dhclient script record the DHCP'ed interface in
  /var/emulab/boot/control_interface

- change control_interface script to first check for that file
  and use the contents if it exists

Note that, as of this commit, we are still telling pump/dhclient which
interface to DHCP on (i.e., we still determine the control net interface
the old way to invoke pump/dhclient) so this commit is not that useful.

What still has to be done is to change the startup to invoke dhclient/pump
on all interfaces.  This turns out to be a royal, royal PITA.

Stay tuned...