DNS Network Latencey, router & AD...
Posted on 2008-10-05
Recently, while our speed tests are testing out at 3mb, the internet is really really slow. When doing a ping, the IP address comes back instantaneously, but a tracert is taking close to 30 seconds. I contacted our ISP and they first elevated the call, then responded as below... I have no clue what it means, and therefore no idea how to resolve it.
The network delays you experienced were most likely caused by a DNS
lookup delay. The IP xxx.xxx.xxx.x49 has a PTR that points to
website1.com. and website2.com. If there were a delay in the DNS server
that hosted these records, it would cause a high network latencey for
you while you were using that IP. This also explains why or tech didn't
experience the same latency, as her tests came from xxx.xxx.xxx.x50..
I fail to understand what that means. How can having 2 domain names resolve to a public IP address they provide which goes to my router, cause latency? We haven't made any changes since April, but after the flooding last month, their servers lost our rdns & i had to call them to re-add it & that's when the slow downs started. (coincidently, after Friday's call, the internet IS faster)...
I AM running AD and Exchange Server 2007 - AD does has references to the two domains I am hosting email for. But my router's DNS addresses are pointed to the ISP and not my internal network. Is that the problem?