Hi Matevz,
you can configure the client via an envvar, from the man page:
XRD_NETWORKSTACK
The network stack that the client should use to connect to the server.
Possible
values are:
IPAll
- use IPv6 stack (AF_INET6 sockets) and both IPv6 and IPv4 (mapped to IPv6)
addresses
IPv6
- use only IPv6 stack and addresses
IPv4
- use only IPv4 stack (AF_INET sockets) and addresses
IPv4Mapped6
- use IPv6 stack and mapped IPv4 addresses
Cheers,
Lukasz
On 11/03/14 20:38, Andrew Hanushevsky wrote:
> Hi Matevz,
>
> Please use the command line option "-I v4". See:
> http://xrootd.org/doc/dev4/xrd_config.htm#_Toc380525636
> You need to use it for the cmsd *and* the xrootd to avoid address
> conflicts.
>
> As for using which address, it depends on how the DNS was setup. Some
> people do it correctly other do not (though that is being increasingly
> rare). The redirector prefers a IPV4 address over an IPV6 address but
> will use an IPV6 address if you happen to come in with an IPV6 address.
> If you come in with an IPV4 address but there is no IPV4 address for the
> target server, the redirection will fail. Most of the time it doesn't
> matter because the redirector will preferentially use the hostname
> whenever possible and let DNS sort things out (which may or may not
> work, depending on the experience of your network people). The only
> issue is locate which is used way too often as this returns actual IP
> addresses (well, it can return hostnames but you have to ask for that).
>
> In the end, let me point out that having a mixed mode IP address
> configuration is always going to be problematic and sites should start
> worrying about it now as we transition to IPV6 (though some pundits say
> that will never happen).
>
> Andy
>
> -----Original Message----- From: Matevz Tadel
> Sent: Tuesday, March 11, 2014 12:23 PM
> To: xrootd-dev
> Subject: Fun with ipv6
>
> Hi,
>
> Apparently xrootd proxy from the master branch will prefer an ipv6
> address over
> an ipv4 one ... this is giving me grief as apparently our machines here
> are not
> configured to handle it and local redirector at UNL (srm.unl.edu) has
> both ipv4
> and 6 addresses.
>
> I tried turning this off on the proxy host (via /etc/gai.conf) but it
> didn't
> help. Is there a config hammer to turn ipv6 off? :)
>
> Matevz
>
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