Hi Laura,

You're very close. You want to set ROS_HOSTNAME instead of ROS_MASTER_IP.
http://www.ros.org/wiki/ROS/EnvironmentVariables

Tully

PS Could you ask this well worded question on answers.ros.org so others with
similar problems can find the answer there too.  Thanks

On Tue, Mar 8, 2011 at 6:40 PM, laura galindez <laurago894@gmail.com> wrote:

> Hello ROS users!
>
> I am trying to teleoperate a pioneer P3AT though a remote computer. I
> previously completed this task following the Getting started with P2OS
> tutorial<http://www.ros.org/wiki/p2os/Tutorials/Getting%20Started%20with%20p2os>.
> However I recently reinstalled Ubuntu 10.04 and ROS Cturtle (I had Boxturtle
> previously) and things aren't really working this time.
>
> Note. My computer's names are lola for the Dell Studio and XPS por the Dell
> XPS. XPS is communicating with the robot and the teleoperation is being
> attempted with lola.
>
> 1. I first indicated both computer's IP adresses on etc/hosts
> 2. I then used ping with each other and everything seemed to work just
> fine.
> 3. I used netcat on port 3333 communicating from XPS to lola and there was
> no problem. However,communication from lola to XPS failed.
>
> I think the problem lays there.
>
> 4. Lola is going to be running roscore so I modified its setup.sh and added
> the following lines:
>
> export ROS_MASTER_URI=http://lola:11311
> export ROS_MASTER_IP=http://lola
>
> 5. On XPS' setup.sh I added the following line:
>
> export ROS_MASTER_IP=http://lola
>
> 6. I run roscore on lola and RosAria node on XPS and communication with the
> robot is established. Rxgrah in both computers shows the /rosout node.
>
> 7. When I run the teleoperation node on lola and display rxgraph, RosAria
> node is enclosed in two red circles and the following message is displayed:
> ERROR: Communication with node[http://XPS:58281/] failed!
>
> 8. When I display rxgraph in XPS, however, every node and topic seems to be
> connecting just fine.
>
> I was wondering if any of you had any clue of what the problem might be.
>
>
> Thank you very much for your help.
>
> Regards!
>
> *Laura Isabel Galíndez Olascoaga
> Mechatronics Engineering
> ITESM-CEM
> Mexico*
>
>
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>
>


-- 
Tully Foote
Systems Engineer
Willow Garage, Inc.
tfoote@willowgarage.com
(650) 475-2827