Hello,
We recently upgraded to xrootd 4.0.4 at Purdue and enabled IPv6 on our
xrootd redirector and servers. We see an issue where cmsd is unable to
connect to xrootd.unl.edu (another IPv6 enabled redirector). I attached
our xrootd config. We point to the FNAL redirector for AAA.
If I simply restart xrootd/cmsd on our redirector, any connection from
either the CERN or FNAL redirector ends with a '[3011] No servers are
available to read the file'.
In the cmsd log I see this repeated every few seconds:
150220 10:27:34 34373 Login: xrootd.unl.edu login failed;
rejected
150220 10:27:34 34373 Remove completed xrootd.unl.edu manager
1.17
150220 10:27:34 34373 Manager: manager.0:[log in to unmask] removed; lost
connection
If I disable ipv6 on our redirector, cmsd will immediately connect to
xrootd.unl.edu using ipv4.
150220 10:28:01 34373 Add xrootd.unl.edu to manager config;
id=1
150220 10:28:01 34373 ManTree: Now connected to 2 root
node(s)
150220 10:28:01 34373 Protocol: Logged into xrootd.unl.edu
Then if I enable ipv6 and restart the network service I am able to do
both v4/v6 transfers using both CERN/FNAL redirectors.
It seems like for AAA access, there is a requirement for me to have a
cmsd connection to xrootd.unl.edu and it does not work over IPv6.
Before I do the disable/enable v6 thing, I do not see a connection open
between Purdue and UNL. I do see an ipv4 one between Purdue and FNAL
without intervention on my part.
After I disable/enable v6, I see this and things start working.
cmsd 26416 xrootd 23u IPv4 2179617 0t0 TCP
xrootd.rcac.purdue.edu:47154->xrootd.unl.edu:mpc-lifenet (ESTABLISHED)
If the UNL redirector gets restarted, that connection is lost and I have
to the restart/enable/disable steps again for redirection from CERN or
FNAL to work.
It seems like there is some ipv6 weirdness between the UNL and Purdue
redirector. Is this a known issue? Perhaps it is already solved in the
4.1.1 release? If so, we can just wait for OSG to release it and
upgrade. But, I figured I should let you know what I found just in case
you had not seen this issue before.
Thanks,
-Erik
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