Not sure if this is the right place to post this.
I have been playing with flow rules (which are awesome) using the documentation Rules Engine | ZeroTier Documentation and just noticed what may be an error in the documentation.
It mentions the following, however the entry “ipprotocol icmp” fails the syntax check (im assuming because “icmp” is its own “function” for checking the type and code of icmp packets).
For convenience the following symbols can be used when matching on certain packet attributes:
IP protocols (ipprotocol): icmp (for IPv4), igmp, ipip, tcp, egp, igp, udp, rdp, esp, ah, icmp6 (for IPv6), l2tp, sctp, and udplite.