[pkg-dhcp-devel] Bug#675372: Bug#675372: isc-dhcp-client: dhclient wastes one minute at boot time on an unplugged link

[Andrew Pollock]

On Sat, Jun 16, 2012 at 11:17:13AM +0200, Andrew Shadura wrote:
> Hello,
> 
> On Fri, 15 Jun 2012 21:30:12 -0700
> Andrew Pollock <apollock at debian.org> wrote:
> 
> > I may have spoken too soon. There's no noticeable time difference
> > between a run of dhclient with or without the -1 option (although I'd
> > have thought we'd want dhclient to hang around in the background in
> > case a cable was subsequently plugged in, so I still don't think that
> > adding -1 to how ifup invokes dhclient is a particularly desirable
> > thing)
> 
> Well, I don't really know what is worse: to have ifupdown to think it's
> okay and mark our interface as being up, but not having it really
> configured (so we have some inconsistency), or to require a user to run
> ifplugd or something to bring it back up when the link is available
> again or to run ifup again by hand. Probably I will just implement some
> kind of callbacks in the next version of ifupdown so we can make it
> really working.

Hey Andrew, thanks for chiming in.

So if I'm understanding what you've said correctly, you're trying to solve
the problem where ifup runs dhclient, dhclient fails to get a lease, but
ifup considers the interface up?

What about the scenario where a server boots and *something* between it and
the DHCP server is temporarily down (including the DHCP server) so it
doesn't get a lease at ifup time, but the dhclient that persists in the
background eventually gets one when the temporarily issue is resolved? With
the -1 option, an administrator is going to have to physically visit the
server to rectify the situation, whereas without the -1, it'll sort itself
out (eventually).

Not that any of this is looking relevant to #675372, as I can reproduce the
problem without the -1 option.

regards

Andrew
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