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I guess this is somewhat related to this question.

I guess you don't have a correct DNS configuration in your network. ROS uses domain names instead of IP addresses per default. When a node registers at the master, it uses the hostname of the computer it is running on. If another node, maybe on a different computer, wants to communicate with that node, it uses this information to establish the connection. Now if a DNS is not present and the hostnames are not mapped to IP addresses in /etc/hosts, the connection cannot be established. The fix is to set ROS_IP on both computers.

You can find more information on fixing your network setup here and here.

I guess this This is somewhat related to this question.

I guess you don't have a correct DNS configuration in your network. ROS uses domain names instead of IP addresses per default. When a node registers at the master, it uses the hostname of the computer it is running on. If another node, maybe on a different computer, wants to communicate with that node, it uses this information to establish the connection. Now if a DNS is not present and the hostnames are not mapped to IP addresses in /etc/hosts, the connection cannot be established. The fix is to set ROS_IP on both computers.

You can find more information on fixing your network setup here and here.

This is somewhat related to this question.

I guess you don't have a correct DNS configuration in your network. ROS uses domain names instead of IP addresses per default. When a node registers at the master, it uses the hostname of the computer it is running on. If another node, maybe on a different computer, wants to communicate with that node, it uses this information to establish the connection. Now if a DNS is not present and the hostnames are not mapped to IP addresses in /etc/hosts, the connection cannot be established. The fix is to set ROS_IP on both computers.computers to their own IP address.

You can find more information on fixing your network setup here and here.