# Revision history [back]

I'm not very clear on the relationship, if any, between eProssima's Fast RTPS and eclipse's cyclonedds.

Apart from the fact that they both implement (partially, in the case of Fast RTPS) the DDS standard, there is none.

I was under the impression that they are separate DDS implementations.

Exactly.

Is that accurate?

Yes.

I may be missing something pretty fundamental here... Or perhaps cyclonedds and its rmw interface is now sufficiently mature that it's bundled with eloquent, and I am just looking at outdated websites.

Fast RTPS is still the default -- afaik and on 2020-04-14.

It may help if you could describe how you've installed ROS 2? Are you installing binaries (ie: .debs from the ROS 2 repositories), or building from source?