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Delay in dns ip searching and solution

Posted by twinclouds 
Delay in dns ip searching and solution
August 25, 2010 06:49PM
I installed Debian, Asterisk, FreePBX, and GV-Sipgate dial out on my Dockstar successfully. I use the defaul ip setting, i.e., dhcp. It in general works fine. However, I did notice that it took a long time when search for the file servers during installation. It also took long time to update the FreePBX modules. It was frustrating but I got by with patience. However, when I tried the GoogleVoice dial out, it get so slow to affect the call reliability. For example, when I call my cell phone from the set up, my cell phone will ring but the calling phone had not set up the ring back yet. I checked CPU and Memory loading and found both are fine. Then I start to suspect that the delay was in searching the DNS ip address.
I did the following experiment. With the default setting, when I ping, e.g., google.com, the delay of send the ping is quite long, about a few seconds. However, the response time was not bad, < 20 ms. Namely there was a long delay between the pings. I then changed the ip setting to static by editing /etc/network/interfaces and added public dns nameservers (I used nameserver, nameserver at the top of the file /etc/resolv.conf, with the intention of reducing the time to search dns addresses. (It looks like dhcp cannot handle fixed dns nameserver). This worked out like a charm. The pings goes continuously. Every operation requires dns ip search is much faster and my Google-Sipgate dial out works perfectly now.
My questions are: Is this a problem only I encountered or everyone has the same experience? Is it a bug in the Debian that I installed (Lenny or for all of the versions of Debian?
Please let me know your experience.

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