Actually, there is a catch about the ROS version. While the script disables neighbor discovery on the automatically created tunnels, the base tunnel to the gateway has to be set up manually. In older version, MNDP was enabled by default. Somewhere around 6.35 it changed to be default disabled. So it is probable that these gateway started to operate with those older versions, and that setting remained they where (a firmware update will not alter the settings, even if they are default ones). Marius, YO2LOJ