Comment Re:Performance of OpenDNS? (Score 1) 61
I did a bit of research into OpenDNS a while ago, the link is
here
I've been a little intrigued by what sort of real benefit the likes of OpenDNS might actually have on, so I thought I'd do a bit of a test of, and see what it does.
SO I thought I'd start with the worlds most popular websites, according to http://www.alexa.com/ I got a list of the top 100 global websites.
the basic results turned out to be...
1. OpenDNS server at 208.67.222.222 average = 108.8787879 min = 15 max = 1273
2. my ISP's DNS server at ns0.zen.co.uk average = 16.9798 min = 13 max = 24
3. a local server running bind 9.2.4 server, having done a rndc flush (this will force a full DNS tree root name resolution - hence the very large times) average = 828.4747475 min = 43 max = 4983
4. the same server as 3, run without flushing the cache average = 1.424242424 min = 0 max = 93
which I think is pretty much what I expected! a local ISP's DNS servers will generally be faster than anything elsewhere because they take advantage of being well used and hence having full cache, and being local so traffic doesn't have to go very far.
a local server doing full root DNS resolutions will take the longest to resolve simply because there is a DNS tree that it needs to propagate through.
I've been a little intrigued by what sort of real benefit the likes of OpenDNS might actually have on, so I thought I'd do a bit of a test of, and see what it does.
SO I thought I'd start with the worlds most popular websites, according to http://www.alexa.com/ I got a list of the top 100 global websites.
the basic results turned out to be...
1. OpenDNS server at 208.67.222.222 average = 108.8787879 min = 15 max = 1273
2. my ISP's DNS server at ns0.zen.co.uk average = 16.9798 min = 13 max = 24
3. a local server running bind 9.2.4 server, having done a rndc flush (this will force a full DNS tree root name resolution - hence the very large times) average = 828.4747475 min = 43 max = 4983
4. the same server as 3, run without flushing the cache average = 1.424242424 min = 0 max = 93
which I think is pretty much what I expected! a local ISP's DNS servers will generally be faster than anything elsewhere because they take advantage of being well used and hence having full cache, and being local so traffic doesn't have to go very far.
a local server doing full root DNS resolutions will take the longest to resolve simply because there is a DNS tree that it needs to propagate through.
