My work computer is connected via LAN cable directly to a router --> bridge --> cable modem setup on our small network. When I boot from Winblows, everything works as expected. However, on this Ubuntu installation, I'm getting a strange 3-10 second delay whenever I access an Internet resource, such as linuxquestions.org in my browser, or searching a repository, or pinging an external address. Now here's three weird points:

1. I don't see this delay in Winblows on the same machine.
2. Pinging google.com returns normal times for this connection (~30ms), but theres a longer than normal delay to begin pinging and return the results of each ping.
3. Intranet resources work as fast as I expect them to.

What am I missing?

EDIT:
I discovered the root of the problem. It isn't in the accessing of the resources, but rather the resolution of the domain names. If I use my browser and go to google.com, there's about a 10 second delay. If I type in one of their IPs directly, it resolves instantly. So the problem is that Ubuntu is having trouble resolving domain names to IP addresses in a timely manner. I know how to fix this problem in Windows, but not Linux. How is this done?

I have seen some systems send ident probes out on tcp port 135 before connecting to services.. Coz they're never answered, it creates a 3-5 sec delay..

Make an iptables LOG rule to check,eg
iptables -t nat -I POSTROUTING -o eth0 -p tcp --dport 135 -j LOG --log-prefix "ident "

If there are, make a rule to reject them, eg
iptables -I OUTPUT -p tcp --dport 135 -j REJECT --reject-with tcp-reset

I wasn't sure how to check the log I created with your first command, so I just tried making the rule. Unfortunatlely, I'm still experiencing a delay... If anything, it's slightly longer.

Not to be a thread-bumper, but does anyone have any ideas as to what to try next?

Only because this thread has been placed rather high on google when using the terms ubuntu domain names delay, I thought I'd take the time to link to the solution to this problem, in case someone else faces this issue in the future:

Add the following to the document that opens (it will likely be empty):
Then go to http://ubuntu.wordpress.com/2006/08/...ster-browsing/ and follow the instructions there. I recommend that step even if you ARE using ipv6 protocols on your network.