DNS Issues - MacbookAir running Snow Leopard

It seems like it has been since the update to snow leopard when my dns issues started, but I'm not quite sure that is the problem.

I have a MBA, so all of my networking is done over my Wireless(AirPort)

I can connect to ANY Wireless Networks fine, grab a DHCP address just fine, and also grab 2/3 DNS servers from the DHCP server just fine.

My issue is that at random intervals my MBA will stop resolving addresses. It can continue to ping out to a DNS server via it's IP address, but will have a connection timeout on resolving the address for roughly 45 seconds. When the 45 seconds is up, it will begin to resolve addresses again. I have poked around google and found that it could be due to DNS sever priorities in Snow Leopard using the bottom DNS first instead of the top. I ruled out that issue by adding on one static DNS server (4.2.2.1)in my network configurations manually.

This happens on every network I am connected to that has a gateway to the internet. I have not tried to resolve local names on a local network, but I have tried resolving 'normal' addresses.

For now, I'm writing this post via remote desktop (windows machine) from my MBA with a static IP inserted as the address because if I stick a address that needs resolved first, every 3-10 minutes it will freeze and won't resolve the name, lose the connection until it can resolve the names again.

I have posted what I thought might help someone else diagnose the issue, because I am stump. Please take a look at my testing outputs here:

http://www.oregonstate.edu/~hillchri/dns

Check out the net testout.txt is where I did the following bash script:

#!/bin/bash
for i in {1..5000}
do
echo $(date)
ping -c 1 4.2.2.1 | grep ms
echo "nslookup www.google.com"
nslookup www.google.com
echo "nslookup www.yahoo.com"
nslookup www.yahoo.com
echo "dig @4.2.2.1 google.com"
dig @4.2.2.1 google.com
echo "------------------------------------------------"
done

Message was edited by: chillconsulting

Macbook Air, Mac OS X (10.3.x)

Posted on Apr 7, 2010 8:42 AM

Reply
16 replies

Jun 25, 2010 7:18 PM in response to chillconsulting

This is not a DNS issue. Doesn't matter what brand the router is or the type of internet connection you have. You plug the router in and you have dhcp and access to that internet connections dns servers automatically. The issue is not snow leapoard. The issue is Safari 5.0 It is slow to resolve web addresses the first time. If you read the discussion groups this is a common problem. The second time it is fast because it gets it from cache. but the first time around can be painful.

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DNS Issues - MacbookAir running Snow Leopard

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