Hi Thomas,
your question sounds a bit like a mix between dCache and SLAC xrootd ;-)?
Of course the experts should comment, but let me add my 2 cents.
If you are talking about SLAC xrootd, I don't see a reason why a
transition between v6 and v4 would not work.
The dual-stack client connects to the xrootd manager/redirector via v6
and gets told where to connect to access the file. If that _new_
connection is made via v4 or v6 should not matter. It is always a new
connection for the client and that's the beauty of the protocol (IMHO).
How dCache handles a situation like this when you have an xrootd client
connecting to a dCache xrootd door via v6 and you have dCache pools on
v4, I don't know.
Cheers,
Andreas
On 25/11/2020 14.10, Thomas Hartmann wrote:
> Hi all,
>
> would it be in principle possible, that the xrd client reastablishes a
> conenction on IPv4 after the initital connection got established over IPv6?
>
> E.g.,
> a dual-stack client connects to a dual-stack redirector/door and the
> connection is established on v6. The requested file is only available on
> a IPv4 node and the redirector points to the pools DNS, that only
> resolves for A but not AAAA.
> The redirect fails as the non-resolved v6 ends up as an invalid redirect
> URL.
>
> I guess, that client/server do not have much chance, after the IP
> flavour got negotiated on the network stack, or?
>
> Cheers,
> Thomas
>
>
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