[Bug 1580694] [NEW] dhclient does not work with some CNA adapters

[Keith Mitchell]

Public bug reported:

Some CNA adapters (such as the Cisco VIC) pass 802.1P frames.  These are
frames that have a TCI field on them but the vlan tag is 0 (this is so
they can pass the priority bits down to the server).

The dhclient in xenial does not work with these adapters (dhclient is
interpreting any tag as invalid and drops the frames when it really
should just be checking the vlan portion of the TCI field).  The fix has
already been applied upstream in isc-dhcp 4.3.4 by the following commit:

https://source.isc.org/cgi-
bin/gitweb.cgi?p=dhcp.git;a=commitdiff;h=f10cbbface262ba51394b2c8ccf402addf7bd6b1

Request to have this backported to xenial for the next release (or move
to 4.3.4 to pickup the fix).

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

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https://bugs.launchpad.net/bugs/1580694

Title:
  dhclient does not work with some CNA adapters

Status in isc-dhcp package in Ubuntu:
  New

Bug description:
  Some CNA adapters (such as the Cisco VIC) pass 802.1P frames.  These
  are frames that have a TCI field on them but the vlan tag is 0 (this
  is so they can pass the priority bits down to the server).

  The dhclient in xenial does not work with these adapters (dhclient is
  interpreting any tag as invalid and drops the frames when it really
  should just be checking the vlan portion of the TCI field).  The fix
  has already been applied upstream in isc-dhcp 4.3.4 by the following
  commit:

  https://source.isc.org/cgi-
  bin/gitweb.cgi?p=dhcp.git;a=commitdiff;h=f10cbbface262ba51394b2c8ccf402addf7bd6b1

  Request to have this backported to xenial for the next release (or
  move to 4.3.4 to pickup the fix).

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