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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 > > > ######################################################################## > 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 -- Karlsruhe Institute of Technology (KIT) Steinbuch Centre for Computing (SCC) Andreas Petzold Hermann-von-Helmholtz-Platz 1, Building 449, Room 202 D-76344 Eggenstein-Leopoldshafen Tel: +49 721 608 24916 Fax: +49 721 608 24972 Email: [log in to unmask] www.scc.kit.edu Registered office: Kaiserstraße 12, 76131 Karlsruhe, Germany KIT – The Research University in the Helmholtz Association ######################################################################## 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