Tested in VyOS 1.3.0-epa3
There is a limit of 31 characters for the group name.
There is an error when trying to create a long group name (this is good)
When trying to create a group of 32 characters, there is no errors:
[email protected]# set firewall group network-group MySecret-Inside-Private-Network 
But if you try a commit after that, you get this:
[email protected]# set firewall group network-group MySecret-Inside-Private-Network  [email protected]# commit [ firewall group network-group MySecret-Inside-Private-Network ] ipset v6.38: Error in line 1: Syntax error: setname 'MySecret-Inside-Private-Network-2106' is longer than 31 characters Error: problem copying group