[Bug 1596502] [NEW] netmask is not updated on renew

[Daniel Panteleit]

Public bug reported:

When only the netmask (or anything besides the ip address) is changed,
the client won't apply those changes.

According to this redhat bug report
(https://bugzilla.redhat.com/show_bug.cgi?id=173619) the problem is
within the dhclient-script.

I found this problem in the following versions (Ubuntu Server):

Description:	Ubuntu 16.04 LTS
Release:	16.04
isc-dhcp-client: 4.3.3-5ubuntu12

and

Description:	Ubuntu 14.04.4 LTS
Release:	14.04
isc-dhcp-client: 4.2.4-7ubuntu12.4

** Affects: isc-dhcp (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1596502

Title:
  netmask is not updated on renew

Status in isc-dhcp package in Ubuntu:
  New

Bug description:
  When only the netmask (or anything besides the ip address) is changed,
  the client won't apply those changes.

  According to this redhat bug report
  (https://bugzilla.redhat.com/show_bug.cgi?id=173619) the problem is
  within the dhclient-script.

  I found this problem in the following versions (Ubuntu Server):

  Description:	Ubuntu 16.04 LTS
  Release:	16.04
  isc-dhcp-client: 4.3.3-5ubuntu12

  and

  Description:	Ubuntu 14.04.4 LTS
  Release:	14.04
  isc-dhcp-client: 4.2.4-7ubuntu12.4

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