[Bug 1196975] Re: ifupdown calling dhclient with -1 causes it to fail when dhcp server unavailable

[Stéphane Graber]

Well, what we want is "try forever in the foreground and daemonize on
success" so not to block ifupdown (which is single threaded) from
executing the post-up scripts. And it's what our patch to dhclient is
supposed to be doing, if it's not, I want to see a log of this so we can
figure out exactly what case is causing it to exit.

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https://bugs.launchpad.net/bugs/1196975

Title:
  ifupdown calling dhclient with -1 causes it to fail when dhcp server
  unavailable

Status in “ifupdown” package in Ubuntu:
  Incomplete

Bug description:
  Present in the Precise version (0.7~beta2ubuntu8) at least:

  ifupdown is hardcoded to call dhclient with -1, which causes it to exit on the first failure.
  This can happen in two ways:
  1) Failure to bring up the interface if the dhcp server doesn't respond in time (default 60s).
  2) Failure to renew if the dhcp server was unavailable during a previous renewal try.

  This is http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=694541 as
  well, it seems.

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