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Hi Erik, Yes, if you have configured a real IPv6 address then that interface is used by default (this is essentially an OS decision since it appears that we can create an IPv6 socket as no other information is available. In your case, the IPv6 address hasn't been fully configured to actually be usable but we don't know that from within the box. This seems to be another deployment mode that isn't an obvious approach. We have seen all sorts of ways sites are deploying an essentially broken IPv6 setup. Anyway, the way to revert to IPv4 mode is to add the following to the command line when starting the cmsd and xrootd (check your sysinit script): -I v4 this will force usage of only the IPv4 stack. I guess movement to IPv6 will be an interesting affair :-) Andy On Wed, 15 Apr 2015, Erik Gough wrote: > Hello, > > We have a dual stack IPv4/IPv6 xrootd redirector at Purdue. Currently, > IPv6 connectivity to the outside world is not working. cmsd on our > redirector keeps trying to connect to xrootd.unl.edu over IPv6 and times > out: > > 50415 14:33:45 42282 Pander trying to connect to lvl 0 > xrootd.unl.edu:1213 > 150415 14:34:48 42282 XrdOpen: Unable to connect socket to > xrootd.unl.edu; connection timed out > 150415 14:34:54 42282 Pander trying to connect to lvl 0 > xrootd.unl.edu:1213 > 150415 14:36:03 42282 Pander trying to connect to lvl 0 > xrootd.unl.edu:1213 > 150415 14:37:12 42282 Pander trying to connect to lvl 0 > xrootd.unl.edu:1213 > 150415 14:38:21 42282 Pander trying to connect to lvl 0 > xrootd.unl.edu:1213 > 150415 14:39:30 42282 Pander trying to connect to lvl 0 > xrootd.unl.edu:1213 > 150415 14:40:39 42282 Pander trying to connect to lvl 0 > xrootd.unl.edu:1213 > 150415 14:41:48 42282 Pander trying to connect to lvl 0 > xrootd.unl.edu:1213 > 150415 14:42:51 42282 XrdOpen: Unable to connect socket to > xrootd.unl.edu; connection timed out > > cmsd 42219 xrootd 54u IPv6 24938337 0t0 TCP > xrootd.rcac.purdue.edu:59977->xrootd.unl.edu:mpc-lifenet (SYN_SENT) > > This is all I get for the connection to UNL. > > Is it possible to make it fall back to IPv4 if the IPv6 connection isn't > available? Is this meant to happen or a possible bug? > > Thanks, > -Erik > > ######################################################################## > Use REPLY-ALL to reply to list > > To unsubscribe from the XROOTD-L list, click the following link: > https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=XROOTD-L&A=1 > ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the XROOTD-L list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=XROOTD-L&A=1