Does this or CJDNS have any mechanisms in place to limit metadata exposure?
From what I could gather, both use public DHTs for routing, and AFAIK public DHTs in general can be rather trivially crawled for metadata.
The current generation Internet already offers plenty of methods to protect message contents, but very few can also obfuscate metadata, which can be just as revealing, but almost always much more readily accessible.
You can run this through a VPN with a port forwarded for UDP. And that VPN can be tunneled through a nested chain of VPNs. That provides some metadata obfuscation.
From what I could gather, both use public DHTs for routing, and AFAIK public DHTs in general can be rather trivially crawled for metadata.
The current generation Internet already offers plenty of methods to protect message contents, but very few can also obfuscate metadata, which can be just as revealing, but almost always much more readily accessible.