On Mon, 9 Aug 2010, Yasuhiro Araki wrote:
I understand. I would like to add new feature for cdn.debian.net which reply CNAME. I think it can use for CNAME virtual host.
2 problems with this.1) cname to a cname should be avoided for efficiency reasons. Today, cdn.debian.net cnames to deb.cdn.araki.net. If deb.cdn.araki.net cnames to another hostname (like ftp.br.debian.org), you'd cause many dns lookups. Worse case could be that the dns resolution will timeout.
$ host cdn.debian.net cdn.debian.net is an alias for deb.cdn.araki.net. deb.cdn.araki.net has address 150.65.7.130 deb.cdn.araki.net has address 202.229.186.27 [etc]2) I think the rfcs suggest that you should not return multiple cnames to a single query, but I can't pinpoint where it says so.