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Hi Brian,

Start with the way the URL is specified. Hostname? IP address? There is 
obviously a difference. I don't see anything in the client that ostensibly 
pushes it to use one or the other (though there really should be).

Andy

On Sun, 27 Apr 2014, Brian Bockelman wrote:

> Hi all,
>
> I have a bit of a mystery to solve (this all running 4.0.0-rc1).
>
> When I run "xrdcp" from my worker nodes to my local Xrootd server, I see the transfers occur over IPv6.
>
> However, when I access files via a version of CMSSW from the same node to the same server, I see the transfers go over IPv4.
>
> Does anyone have any hints on how to determine why this difference occurs?  Maybe just because it's Sunday, but I'm stumped on where to start.
>
> Thanks,
>
> Brian
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