[Sysadmins] Eircom DNS

Cian Brennan lil_cain at redbrick.dcu.ie
Wed Jul 8 10:01:21 IST 2009


On Wed, Jul 08, 2009 at 09:56:55AM +0100, Nick Hilliard wrote:
> 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.
> 
Given that they're entirely up front about it, it seems fair enough. They
provide an occasionally useful service, and don't charge for it. Wildcard A
records, and and visiting google through a proxy seem a fair enough price to
pay it.

> 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.
> 
> Nick
> 
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