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Hi Andy, Thanks for the info. So in the case of a dual stack IPv4/IPv6 redirector connecting to a IPv4 redirector (like the one at FNAL) I assuming that the name resolution comes back with a IPv4 address and a IPv4 socket is used. Is there not a way for cmsd to determine that a IPv6 connection fails and to try the connection over IPv4? Does the -I v4 disable IPv6 altogether? If all my xrootd servers are connected to the redirector over IPv6, will I also need to restart them with the same option? Thanks On Wed, 2015-04-15 at 17:23 -0700, Andrew Hanushevsky wrote: > 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