Limited support
This feature is only present in Portal 2: Community Edition and Portal: Revolution. mm_dedicated_force_servers
🟪 Executable on Client and Server
mm_dedicated_force_servers <value>
Comma delimited list of ip:port of servers used to search for dedicated servers instead of searching for public servers.
Use syntax publicip1:port|privateip1:port,publicip2:port|privateip2:port
if your server is behind NAT.
If the server is behind NAT, you can specify 0.0.0.0|privateip:port
and if server port is in the list of mm_server_search_lan_ports
its public address should be automatically detected.