ROS_IPV6 On gives error Failed to contact master

asked 2019-01-14 14:04:36 -0500

RDaneelOlivaw gravatar image


I've seen some questions about this topic but it doesn't seem to be answered or solved anywhere that I've seen. A simple experiment, run the following in a terminal with ROS Kinetic installed:

export ROS_IPV6=on

It will give you:

[ERROR] [1547495518.147351234]: [registerService] Failed to contact master at [].  Retrying...

My question is : In Ipv4, ROS_MASTER_URI=, Works in Ipv6, ROS_MASTER_URI=, Doesn't. So what address fro the localhost exactly is the one needed for this to work?.

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I had a problem recently with this variable.

I had two machines and I could rostopic list and rostopic info without any problem, but rostopic echo /topic_from_other_computer never worked.

Even after trying I couldn't make it.

After more investigation, I realized that on one machine I had the ROS_IPV6=on variable and in the other one where roscore was running I didn't have that variable.

I just ran unset ROS_IPV6 on the machine that had that variable and then everything worked fine.

Ruben Alves gravatar image Ruben Alves  ( 2019-06-28 10:54:04 -0500 )edit