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Did you check all the steps at:

http://www.ros.org/wiki/ROS/NetworkSetup

Also i had some trouble with some entries in the /etc/hosts file since the entries there usually overwrite the information from the DNS/DHCP Server. If you have some entries there, you can make a backup of your /etc/hosts file and delete every entry except the following:

127.0.0.1   localhost

At least this was the cause for a similar problem in a network with non-static IP addresses....