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Cause
When running DHCPv6 relay agent and 'lower' interface is specified ('-l') on command line before 'upper' interface ('-u').
Consequence
Relaying of messages does not work.
Fix
Problem in one of our patches was identified and fixed.
Result
DHCPv6 relay agent properly relays messages.
Created attachment 945309[details]
upstream patch for bug #1005814
Description of problem:
Patch [1] that we use to fix bug #1005814 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
http://pkgs.devel.redhat.com/cgit/rpms/dhcp/tree/dhcp-4.2.5-ipv6-bind-to-interface.patch?h=rhel-7.1
Version-Release number of selected component (if applicable):
dhcp-4.2.5-30.el7
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
Verified with dhcp-4.2.5-32.el7. dhcrelay works with any 'upper' 'lower' interface order on the cmdline.I can also confirm that bz#1005814 works as well.
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-2015-0450.html