Well, I certainly agree with the principle -- it's silly to deploy an IPv6 address but not the corresponding network. Further, IIRC, the various RFCs clearly state that IPv6 addresses should be tried first. It's also been how I've advocated to approach the problem previously.
However, I think Mats has convinced me that the correct way may not be the best way because:
- The end-user shouldn't be punished at $REMOTE_GRID_SITE_XYZ because of a misconfigured worker node. Currently, the only workaround is to tell the user to ban the site (undesirable) or unconditionally disable IPv6 (also undesirable).
- It'd be useful to have the behavior hew closer to other common CLI clients to avoid admins recommending "use
curl instead of xrdcp because it works more often". In this case, we could always recommend the user to utilize wget / curl to talk to the Xrootd server for the purpose of reliability ... which would just be a bizarre thing to say!
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