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Assuming that you are running roscore on the local machine, open a terminal and try the following:

$ ifconfig

This will show you your ip address, among other info.

Once you find out what your ip address is, in terminal type the following:

$ echo $ROS_MASTER_URI

and

$ echo $ROS_IP

Ensure that these match what you found in the first step.

If not, go in to your /.bashrc and type the following

$ export ROS_MASTER_URI=http://**your_ip_address**:11311 
$ export ROS_IP=**your_ip_address**

Either re-source your .bashrc or close terminal and re-open a new one before running another roscore.

Assuming that you are running roscore on the local machine, open a terminal and try the following:

$ ifconfig

This will show you your ip address, among other info.

Once you find out what your ip address is, in terminal type the following:

$ echo $ROS_MASTER_URI

and

$ echo $ROS_IP

Ensure that these match what you found in the first step.

If not, go in to your /.bashrc and type the following

$  export ROS_MASTER_URI=http://**your_ip_address**:11311 
$  export ROS_IP=**your_ip_address**

Either re-source your .bashrc or close terminal and re-open a new one before running another roscore.

Assuming that you are running roscore on the local machine, open a terminal and try the following:

$ ifconfig

This will show you your ip address, among other info.

Once you find out what your ip address is, in terminal type the following:following at the bottom:

$ echo $ROS_MASTER_URI

and

$ echo $ROS_IP

Ensure that these match what you found in the first step.

If not, go in to your /.bashrc and type the following

 export ROS_MASTER_URI=http://**your_ip_address**:11311 
 export ROS_IP=**your_ip_address**

Either re-source your .bashrc or close terminal and re-open a new one before running another roscore.