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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