On Aug 13, 2013, at 6:47 AM, Ken Peng <[email protected]> wrote: > On 2013-8-13 18:30, Jared Mauch wrote: >> I'm not sure how accurate this really is, but: >> >> http://www.cdnplanet.com/blog/which-cdns-support-edns-client-subnet/ >> >> Basically, it helps pass the client IP upstream so the CDN can make a better >> guess to which cluster to direct you to, instead of the query-source IP of >> the recursive they are talking to. > > but how to implement that? since local DNS server always has caching.
The CDNs typically do this through chained CNAMES, with one of them having a low TTL. ;; ANSWER SECTION: swcdn.apple.com. 3242 IN CNAME swcdn.apple.com.akadns.net. swcdn.apple.com.akadns.net. 38 IN CNAME swcdn.apple.com.c.footprint.net. - Jared _______________________________________________ dns-operations mailing list [email protected] https://lists.dns-oarc.net/mailman/listinfo/dns-operations dns-jobs mailing list https://lists.dns-oarc.net/mailman/listinfo/dns-jobs
