A question from somebody who is not so knowledgeable in this area. If your ISP uses a transparent proxy, does it really matter then what DNS you put in your router since they will ignore it and use their own DNS resolution?
This breaks proxy services like unblock-us usually. But even with their transparent proxy I have noticed that on TCL at least, when a different proxy address is specified, some of the CDN's are really slow. The Herald is one such example which performs really slow when the proxy server in my router is not set to the TCL ones.
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freitasm: Not being mean, but being mean... Probably someone who (wrongly) decided to use Google DNS or OpenDNS thinking they would greatly improve performance for the company.
+1 Such a common problem for IT guys which don't understand DNS and start messing around. I see this quite a bit.
Nothing like sucking out Windows Updates from Spain at 20KB/s :-)
Quite normal for a small/medium size business to have it's own dns servers as many are running SBS or AD servers, just a matter or not putting something silly in the forwarders.
FYI, you can also hit CDN problems if you use a VPN. eg if DNS resolution takes place at the far end of the tunnel, but the web traffic isn't routed that way too. One way to avoid that is to use search domains to limit DNS resolution to just the subset that are on the VPN. The VPN server should be configured to do this but if it's not you can work around it on your own machine.
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