DNS-lookup to AAAA (IPv6) doesn't seem to work

Thank you for taking the time to report this bug and helping to make Ubuntu better. You reported this bug a while ago and there hasn't been any activity in it recently. We were wondering if this is still an issue for you. Can you try with the latest Ubuntu release? Thanks in advance.

It is still an issue for me, with version 3.1.0-4 from the Debian archives. This is also the version Ubuntu is using, so re-opening this bug. Backuppc should get IPv6 support, I was just bitten by this bug.

Thank you for the feedback dazjorz, I will mark the bug as Confirmed based on your comment.

Is this bug fixed yet? I think it's more important than Wishlist since IPv6 is spreading and it not working can be considered a real bug. Also, it seems fairly simple to fix. Has it been triaged to the backuppc developers yet?

I am currently backing up quite a few machines with BackupPC, two of them are IPv6 only--but they are linux boxes. Is this just a problem with SMB/Windows backups?

IPv6 is not 'part' of BackupPC. IPv6 is part of the OS. BackupPC uses rsync to backup files from linux machines which in turn is capable of making IPv6 connections. I can confirm that BackupPC using rsync to another linux box works. Since no one is answering questions or providing more information on the bug, I am marking it as invalid. If someone can show that there is a bug and provide a little more detailed information, please re-open it.

Aaron, I am most completely aware that IPv6 support is provided by the OS, not BackupPC. The server and desktop I was using BackupPC with, both support IPv6 and are able to ping and connect to each other without any problems, yet backups kept failing. I was, apparantly, not the only one.

Reopening this bug as 'Incomplete', so I will check the status of this bug again once I get to that network, which will be in a week's time.

As far as I've found, there are two points where IPv6 Fails.

Firstly, in the use of gethostbyname. You'll need to install libsocket6-perl. I tried getnameinfo, but for some reason that didn't work so I've used getaddrinfo:

=== modified file 'bin/BackupPC_dump'
--- bin/BackupPC_dump 2008-06-30 11:20:59 +0000
+++ bin/BackupPC_dump 2010-07-16 13:54:27 +0000
@@ -91,6 +91,7 @@
 use File::Path;
 use File::Find;
 use Getopt::Std;
+use Socket6;

 ###########################################################################
 # Initialize
@@ -247,7 +248,8 @@
     } else {
         $host = $client;
     }
- if ( !defined(gethostbyname($host)) ) {
+
+ if ( defined(getaddrinfo($host,"22")) ) {
         #
         # Ok, NS doesn't know about it. Maybe it is a NetBios name
         # instead.

Secondly, is the use of ping in CheckHostAlive in lib/BackupPC/Lib.pm
If you are IPv6 only, you can change $Conf{PingPath} to /bin/pin6 in config.pl
The alternative is to change $Conf{PingCmd} to '' in config.pl which skips the ping test.

This bug was fixed in the package backuppc - 3.2.0-3ubuntu2

---------------
backuppc (3.2.0-3ubuntu2) natty; urgency=low

  * Applied ipv6-support.dpatch, debian/control:
    Add support for ipv6. (LP: #54918)
 -- Chuck Short <email address hidden> Mon, 07 Mar 2011 11:35:50 -0500