On Fri, Oct 29, 2010 at 20:47, Dan Langille <[email protected]> wrote:
> On 10/29/2010 4:19 PM, Dylan Vanderhoof wrote:
> > On 10/23/10 11:30 AM, "Dan Langille"<[email protected]> wrote:
> >
> > On 10/22/2010 11:13 PM, Dylan Vanderhoof wrote:
> >> This appears to be a bacula-fd bug, as best I can tell. Perhaps
> somebody can shed some enlightenment as to how I might get around it?
> >>
> >> We have a bacula server running v4 and v6, with an A and AAAA record.
> All functional clients are IPv4 and are working great.
> >>
> >> I'm trying to add a hosts that backs up via IPv6. (It doesn't have IPv4
> reachability to the server) The client still dual-stack however.
> >>
> >> I can use FDAddresses in the bacula-fd.conf on the client to prevent the
> client from listening on its IPv4 address. However, when I actually try to
> run a backup, the client contacts the SD by name and ignores the AAAA record
> for the SD. Even though the FD is not bound to an IPv4 address, it still
> attempts to use IPv4 to connect to the SD, since there is an A record
> present. Since there's no IPv4 reachability, the operation times out and
> the backup hangs.
> >>
> >> Suggestions?
> >>
> >> Ideally, it seems is an FD is configured to only listen on an ipv6
> address, it shouldn't attempt to connect to the SD on IPv4. (More to the
> point, I'd think it would try to connect via whichever address family the
> server contacted it on to kick off the backup)
> >
> > Have you asked this question on the users mailing list?
> >
> > What version of Bacula are you using?
>
> >> Sorry it took so long for me to get back on this.
> >>
> >> I'm on 5.0.3, ipv6 support is compiled in, and the client is correctly
> resolving (on an OS level) the AAAA and A record for the SD.
>
> If your host has both A and AAAA records, then it's expected to be
> providing services on both addresses. Actually, Bacula takes IPv6 in
> preference.
>
> Solution: if you are providing IPv6 only services, create a new hostname
> with only an AAAA record. Simple. Easy. No code required.
>
> --
> Dan Langille - http://langille.org/
>
Would it be possible to have Bacula, and try the other stack after a failure
if there are both types of records present? It seems to be emerging as the
standard practice among most client programs I've seen
I think this would be a far better solution than trying to restrict
connectivity via config when you have corner cases due to the nature of the
dual stack transition, when split horizon DNS has not been employed.
-Blake
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