Slow Internet Lookups Not Connection

[JustinK101]

Running CentOS 4.4. Whenever I go to a web URL or do any network activity outside of the LAN the lookup is extremely slow on the server. It takes from 3 - 10 seconds. Once it looks up though the speed is good, for example I can download files at 150KB a second. At first I though it was my firewall/router, but none of the other computers are experiencing this problem. I looked at the internal firewall built into CentOS and as I confirmed it is disabled, also Linux Enhanced Security is also disabled. Does any body have a clue what is going on? This didn’t use to happen.

This happens not only for HTTP traffic. For example, when I remote SSH into the sever it pops up the username and password field instantly, but it takes 5 - 10 seconds to authentic and show the prompt. This didn’t use to be the case, it used to authentic almost instantly.

Thanks for any help, comments.

[Skiboy]

You may want to look at the configuration of the NIC.
Do:
ethtool eth0

Make sure "autoneg is off", "Duplex is full" and "speed is 100"

If not use ethtool to set them.

[nikunjb]

Sounds like it could be your dns config. Can you make sure the nameservers listed in your /etc/resolv.conf file are accessible?

[JustinK101]

Here is the contents of my /etc/resolv.conf file:

; generated by /sbin/dhclient-script
nameserver 192.168.0.1

That ip address is the ip address of our hotbrick router. Is that right?

[nikunjb]

Here is the contents of my /etc/resolv.conf file:

; generated by /sbin/dhclient-script
nameserver 192.168.0.1

That ip address is the ip address of our hotbrick router. Is that right?

Should be ok if the router has DNS server running or has a dns forwarder. You can try replacing the address with that of your ISP's DNS server and see if that improves ur lookup times.