[Bug 1274010] [NEW] "dhclient -1" considered harmful

[Philipp Kern]

Public bug reported:

netcfg in Ubuntu diverges from the one in Debian by using dhclient from
isc-dhcp-client instead of udhcpc (well, except kfreebsd and hurd).
dhclient is run with -1 to acquire a lease once and exit. With short
lease times configured on the DHCP server (say, half an hour) and DHCP
snooping enabled on switches, the installer will lose network
connectivity once the lease expires. "-1" ensures that dhclient does not
daemonize and hence it will not continuously renew the lease. I recall
some differences in behavior with "-1", though, related to how it
handles not getting a lease at all (I think it's forking into the
background and continue trying instead of failing and exiting). So this
would need some fixing, hopefully through configuration options. As the
file is already written out, there should be full flexibility there.

** Affects: netcfg (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1274010

Title:
  "dhclient -1" considered harmful

Status in “netcfg” package in Ubuntu:
  New

Bug description:
  netcfg in Ubuntu diverges from the one in Debian by using dhclient
  from isc-dhcp-client instead of udhcpc (well, except kfreebsd and
  hurd). dhclient is run with -1 to acquire a lease once and exit. With
  short lease times configured on the DHCP server (say, half an hour)
  and DHCP snooping enabled on switches, the installer will lose network
  connectivity once the lease expires. "-1" ensures that dhclient does
  not daemonize and hence it will not continuously renew the lease. I
  recall some differences in behavior with "-1", though, related to how
  it handles not getting a lease at all (I think it's forking into the
  background and continue trying instead of failing and exiting). So
  this would need some fixing, hopefully through configuration options.
  As the file is already written out, there should be full flexibility
  there.

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