Hi Chris,

 * If it reports None, then ROS_IP is not set. More specifically, I am
referring to setting ROS_IP in your shell, not the launch file itself
 * ROS_IP has no effect on ROS_MASTER_URI.

 - Ken

On Wed, Nov 17, 2010 at 12:08 PM, chris_li <gang.li@okstate.edu> wrote:
>
> Hi Ken,
>
> It reports: None
>
> I am confused here. I thought I could either use the IP address or the name
> to locate the machine. I prefer IP address. I am pretty sure that the two
> IPs of my two machines are correct.
>
> Can I use the IP to set ROS_IP and ROS_MASTER_URI ??
>
> Thanks.
>
> Chris
>
>
>
> On Wed, Nov 17, 2010 at 1:00 PM, Ken Conley [via ROS-Users] <
> ml-node+1919381-904127158-111067@n3.nabble.com<ml-node%2B1919381-904127158-111067@n3.nabble.com>
>> wrote:
>
>> Hi Chris,
>>
>> Please run the following command:
>>
>> python -c "import roslib.network; print
>> roslib.network.get_address_override()"
>>
>> That should report 192.168.1.122. If it reports **-toshibalaptop, it
>> probably won't work, unless you set that up in /etc/hosts or DNS.
>>
>> cheers,
>> Ken
>>
>> On Wed, Nov 17, 2010 at 11:45 AM, chris_li <[hidden email]<http://user/SendEmail.jtp?type=node&node=1919381&i=0>>
>> wrote:
>>
>> >
>> > Hi Ken,
>> >
>> > Thanks for your reply. Please check my previous post again, I correct my
>> > misspelling.
>> >
>> > And I think I did set ROS_IP on my machine that I am running roslaunch.
>>  The
>> > name of the machine is:
>> > ***-toshibalaptop,  its ip is 192.168.1.122        And the other
>> machine's
>> > ip is 192.168.1.100
>> >
>> > Please advise.
>> >
>> > Sincerely,
>> > Chris
>> > --
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