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Dear Ulf,

On 27/05/14 22:01, Ulf Tigerstedt wrote:
> We (at NDGF-T1) are trying to be ahead of demand and are testing dCache
> as an IPv6 xrootd-server... but it's not going very well.

    great to hear, you should have contacted us earlier.

> http://xrootd.org/doc/dev4/XRdv300.htm#_Toc372751539 says that the node
> response should look like:
>
> xy[::aaa.bbb.ccc.ddd.eee]:ppppp

    Yes, that's an old style of IPv6 encoded IPv4 address. 
xy[::ffff:aaa.bbb.ccc.ddd.eee]:ppppp also works fine.

> Giving the xrdfs client an IPv6 answer like
> Sw[::2001:948:40:2:0:0:0:149]:1094  causes the client to sputter out
> "Invalid address" and refuses to work.

    It prints the error message, because this in fact is an invalid IPv6 
address. You should have returned [2001:948:40:2:0:0:0:149]:1094

> When testing xrdfs against an xrootd daemon over IPv6, the answer is a
> bit sad:
> Sw[::193.166.0.114]:1094   = the machine handshakes over IPv6, then
> switches to IPv4 for everything else.

    Most of the requests handled by xrdfs either redirect or use locate 
queries and the client goes to a host it is pointed to. It switched to 
IPv4 because the server told it to do so.

    Good for you.

Cheers,
    Lukasz

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