[Bug 1543657] [NEW] settle-dad.sh expects netmask to be provided, but netmask is not marked 'required'

[Graham Clinch]

Public bug reported:

=
Description:	Ubuntu Xenial Xerus (development branch)
Release:	16.04

ifupdown:
  Installed: 0.8.10ubuntu1
  Candidate: 0.8.10ubuntu1
=

For the inet6 static method, interfaces(5) implies that only 'address'
is required (and thus netmask is optional), however settle-dad.sh
assumes IF_NETMASK is being set.  If only address is supplied, the
following message is logged:

Waiting for DAD... Error: inet6 prefix is expected rather than
"2001:db8:ab:cd::12/"

and settle-dad.sh returns immediately, before DAD has settled.

'ip address list' appears to ignore the netmask if it is supplied, so
settle-dad could probably just use '[..] to "${IF_ADDRESS}"'.
Alternatively, 'netmask' could be documented as 'required'.

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

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https://bugs.launchpad.net/bugs/1543657

Title:
  settle-dad.sh expects netmask to be provided, but netmask is not
  marked 'required'

Status in ifupdown package in Ubuntu:
  New

Bug description:
  =
  Description:	Ubuntu Xenial Xerus (development branch)
  Release:	16.04

  ifupdown:
    Installed: 0.8.10ubuntu1
    Candidate: 0.8.10ubuntu1
  =

  For the inet6 static method, interfaces(5) implies that only 'address'
  is required (and thus netmask is optional), however settle-dad.sh
  assumes IF_NETMASK is being set.  If only address is supplied, the
  following message is logged:

  Waiting for DAD... Error: inet6 prefix is expected rather than
  "2001:db8:ab:cd::12/"

  and settle-dad.sh returns immediately, before DAD has settled.

  'ip address list' appears to ignore the netmask if it is supplied, so
  settle-dad could probably just use '[..] to "${IF_ADDRESS}"'.
  Alternatively, 'netmask' could be documented as 'required'.

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