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As a simple recap in order to communicate between two machines using ROS2 DDS:

• Disable firewalls (or update the configuration to allow the communication) -Look at the different networking interfaces
• Make sure to have the two machines under the same subnetwork
• Make sure that the DDS libraries are using the correct interface
• Make sure that the DDS libraries are not using shared memory communication (versus multicast)
• Enable your network switch to use multicast
• Try pinging the two machines between each others
• Export the same ROS_DOMAIN_ID

As a simple recap in from all the comments (@Karsten, @gvdhoorn). In order to communicate between two machines using ROS2 DDS:

• Disable firewalls (or update the configuration to allow the communication)
-Look
• Look at the different networking interfacesinterfaces (ifconfig on ubuntu, Ipconfig /all on windows)
• Make sure to have the two machines under the same subnetworksubnetwork (same network mask,.. )
• Make sure that the DDS libraries are using the correct interface interface
• Make sure that the DDS libraries are not using shared memory communication (versus multicast)
• Enable your network switch to use multicast
• Try pinging the two machines between each others
• Export the same ROS_DOMAIN_IDROS_DOMAIN_ID (https://discourse.ros.org/t/how-to-run-example-talker-listener-on-2-machines-with-different-ipaddr/2106)

As a simple recap from all the comments (@Karsten, @gvdhoorn). In order to communicate between two machines using ROS2 DDS:

• Disable firewalls (or update Update the configuration to allow the communication) communication in your Firewall (or disable it)
• Look at the different networking interfaces (ifconfig on ubuntu, Ipconfig /all on windows)
• Make sure to have the two machines under the same subnetwork (same network mask,.. )
• Make sure that the DDS libraries are using the correct interface
• Make sure that the DDS libraries are not using shared memory communication (versus multicast)
• Enable your network switch to use multicast
• Try pinging the two machines between each others
• Export the same ROS_DOMAIN_ID (https://discourse.ros.org/t/how-to-run-example-talker-listener-on-2-machines-with-different-ipaddr/2106)