Hi Andy,
On 8/30/16 3:59 PM, Andrew Hanushevsky wrote:
> Hi Marian,
>
> I don't immediately see the problem other than perhaps a misconfiguration
> of the client machine where it really want to resolve the host to an IPv6
> address. Note that there is only one IPv4 address for the problematic host
>
> 0: [::ffff:193.205.76.72] stormgf1.pi.infn.it
>
> So, forcing IPv4 would be the obvious solution and would indicate that
> there is a problem with the way resolution works on the client host.
that's what's weird - not forcing v4 we get that host unresolved
according to what xrdcp log says (Unable to resolve IP address for the
host) and things exit with "no server found". Does xrdcp have own
mechanism for name resolving? Running host or dig locally against
stormf1.pi.infn.it work OK.
> On
> the other hand, this may be an issue with the redirector. The addresses
> assigned to the redirector make no sense:
>
> allipmap xrootd-cms.infn.it
> 0: [::ffff:134.158.132.31] llrxrd-redir.in2p3.fr
> 1: [::ffff:131.154.216.11] xrootd-cms-redir-01.cr.cnaf.infn.it
> 2: [::ffff:193.205.76.83] xrootd-redic.pi.infn.it
> 3: [::ffff:90.147.66.75] xrootd.ba.infn.it
> 4: [2001:760:4205:216::11] xrootd-cms-redir-01.cr.cnaf.infn.it
>
> What's going on here?
why this looks not normal to you? There are 4 hosts behind DNS alias.
One of them is dual-stack IPv6 enabled
(xrootd-cms-redir-01.cr.cnaf.infn.it):
$ fping6 xrootd-cms-redir-01.cr.cnaf.infn.it
xrootd-cms-redir-01.cr.cnaf.infn.it is alive
-Marian
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