[Bug 893765] Re: boot hang when network cable is unplugged and /etc/network/interfaces used

[Stéphane Graber]

This is the expected behaviour, we have a timeout at 2 minutes though
since 11.10.

Quite a few systems require almost a minute for the link to appear, so
there's no way we can reliably depend on that. As for cases where the
interface doesn't exist, on quite a few system, it just doesn't exit
"yet". New systems with an impressive number of network cards can take
minutes before the kernel creates the network card.

** Changed in: ifupdown (Ubuntu)
       Status: New => Won't Fix

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https://bugs.launchpad.net/bugs/893765

Title:
  boot hang when network cable is unplugged and /etc/network/interfaces
  used

Status in “ifupdown” package in Ubuntu:
  Won't Fix

Bug description:
  Steps to reproduce:
  (deinstall networkmanager and) setup network interface to use dhcp  (like  auto eth0; iface eth0 inet dhcp)
  unplug the network cable from the interface (eth0 in this case)
  boot

  expected result:  system skips interface configuration and gives error immediately, because  no link is NO LINK.
  actual result: Boot hangs for something like 4 minutes, waiting for the cable to levitate to the socket magically.

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