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Created attachment 945313 [details]
upstream patch for bug #1001742

Description of problem:
Patch [1] that we use to fix bug #1001742 breaks dhcrelay (dhcp relay agent daemon) for IPv6.
When the 'lower' interface is specified ('-l') on command line before 'upper' interface ('-u') the relaying of messages does not work.
Example:
$ dhcrelay -d -6 -I -l eth0 -u eth1

[1] http://pkgs.devel.redhat.com/cgit/rpms/dhcp/tree/dhcp-4.1.1-P1-ipv6-bind-to-interface.patch?h=rhel-6.6

Version-Release number of selected component (if applicable):
dhcp-4.1.1-43.P1.el6.x86_64

How reproducible:
always

Steps to Reproduce:
1. [relay machine]
  $ dhcrelay -d -6 -I -l eth0 -u eth1
2. [relay machine]
  $ wireshark
3. [client machine]
  $ dhclient -d -6 -S ethx (ethx is connected to the same link as dhcrelay's 'lower' interface)

Actual results:
no Relay-Forw message

Expected results:
Relay-Forw message sent to ff05::1:3

Additional info:
dhcrelay -d -6 -I -u eth1 -l eth0
still works

clone of bug #1151039 (RHEL-7)

Lowering both severity/priority as the IPv6 version of dhcrelay is probably not much used and there's a workaround (changing order of command-line arguments).

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-1258.html