Impact of OpenDNS on CDN services particularly when used in Asia
At work, I am testing a CDN service run by Panther Express. I have been asking various colleagues and friends to run pings,traceroute and send me some HTTP response headers to analyze which Panther POP gets picked up where
Whilst working with a colleague in our Manila office, I found that he was being redirected to a Panther POP in San Jose California instead of being redirected to either a Hong Kong or Singapore POP as I expected.
I asked him for his /etc/resolv.conf entries and when he sent those to me, I found that one of the entries was that of OpenDNS dns cache. Whilst I truly appreciate OpenDNS’s work particularly its PhishTank system and API which we also use as part of SURBL, I think Asian users should understand that if they use OpenDNS then their DNS traffic leaves from the US and Content Delivery Networks like Akamai, Limelight, Mirror Image, Panther Express will route them to their US POP’s instead of their Asian POP’s
Once my colleague removed the OpenDNS entry, he was routed to the Asian POP for Panther Express