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Hi, Thank you all for replying! We got it working by setting the environment for the client :) All UCSD T2 does not have ipv6 routes: [1055] root@uaf-7 /var/log/xrootd# traceroute6 srm.unl.edu traceroute to srm.unl.edu (2600:900:6:1101:5054:ff:fe54:a2ad), 30 hops max, 40 byte packets socket: Address family not supported by protocol so we didn't hit the fact that srm.unl.edu only listens on ipv4 address :) Matevz On 03/11/14 13:02, Brian Bockelman wrote: > Hi, > > Is it not possible to have the client use AI_ADDRCONFIG by default? > > To give more info - srm.unl.edu resolves on both v4 and v6, but is running a version of xrootd server which only binds on the v4 address. > > Brian > > On Mar 11, 2014, at 2:38 PM, Andrew Hanushevsky <[log in to unmask]> 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 >> >> ######################################################################## >> Use REPLY-ALL to reply to list >> >> To unsubscribe from the XROOTD-DEV list, click the following link: >> https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=XROOTD-DEV&A=1 >> ######################################################################## >> Use REPLY-ALL to reply to list >> >> To unsubscribe from the XROOTD-DEV list, click the following link: >> https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=XROOTD-DEV&A=1 > > ######################################################################## > Use REPLY-ALL to reply to list > > To unsubscribe from the XROOTD-DEV list, click the following link: > https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=XROOTD-DEV&A=1 > ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the XROOTD-DEV list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=XROOTD-DEV&A=1