initializing roscore, unkown host

edit

Hey,

OS: Fedora 14 ROS: Fuerte

Error, while initializing roscore:

Unable to contact my own server at [http://scitos:50689/]. This usually means that the network is not configured properly.

A common cause is that the machine cannot ping itself. Please check for errors by running:

ping scitos

For more tips, please see

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

ping scitos delivers

unkown host scitos

ping localhost works fine, ping 127.0.0.1 likewise

Solutions according to ros-wiki is to set

ROS_HOSTNAME=localhost ROS_MASTER_URI=http://localhost:11311

this has not worked ping $ROS_HOSTNAME does fine, while ping $ROS_MASTER_URI returns

unknown host http://localhost:11311

Any ideas why this does not work? Maybe some issue concerning my network connection(using wireless for internet, still there are two ethernet accesses, which are currently not used)?

thx :-)