Why can I see my samba shares from CentOS 7 but not Fedora 30?

I'm experiencing problems configuring samba on my Fedora machines. Everything has always worked great on CentOS but identical configurations are having problems with Fedora. I have three computers on the same network, lets call them: A, M, and L. All computers have identical [global] entries in their smb.conf. 'A' is running CentOS 7, has no problems, and can see all hosts and shares for A, M, and L according to smbtree. Both 'M' and 'L' are running Fedora 30 but cannot resolve any NETBIOS names (I can't ping the other machines by hostname), and see nothing on smbtree, not even its own shares. Interestingly, there is also a Windows machine on the network. Lets call this machine 'W'. All of the Linux systems can resolve this machine by its hostname and ping it. The problem is with the Linux machines talking with each other. smb.conf (all machines): [global] workgroup = WORKGROUP security = user passdb backend = tdbsam printing = cups printcap name = cups load printers = yes cups options = raw hosts allow = 127. 10.0.1. ntlm auth = yes Firewall open services (all machines): samba ntp dhcpv6-client ssh samba-client Note that the Fedora machines also allow the mdns through the firewall. That's it. It should be simple but it's not working. What's going on?