[Sysadmins] Eircom DNS
nick at netability.ie
Wed Jul 8 09:56:55 IST 2009
On 08/07/2009 08:42, Conall O'Brien wrote:
> I saw one article recommending OpenDNS as a fix, which made me sad.
OpenDNS do a lot of bad things, including wildcard A records, which are
a particularly nasty trick.
Also, if you use openDNS or other resolvers which aren't hosted on your
ISPs address space, your general internet connectivity quality may drop
dramatically, as CDNs (content distribution networks) like Akamai,
Limelight and so forth, use the address on your DNS resolver to
determine which local cache to use. If you use your ISP's resolver,
you'll be directed to the cache which is topologically closest to you
(in the case of Akamai, this will be very close indeed). If you use
OpenDNS, you'll probably be redirected to some cache service in mainland
USA or at best somewhere in europe, and both your WWW latency and
throughput to these CDN serviced sites will drop dramatically.
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