[CentOS] cr repo and firewalling

 in line editing.

> If I understood what you said I would rephrase it with less words like
>
> 1) set up a proxy [and filter the host: header (if you feel the need to]
> 2) do a local mirror
3) bypass DNS and just use a particular mirror host (some better
suggestions proposed for putting the IP in the repo files); this
should probably be your least desirable path)
>
> Thanks
> --

but yes, that's what seems (at least to me) to the most reasonable
ways to fix this problem.

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