RDiver

如果你用steam版本, 就係steam內既left 4 dead 2(.exe) 上面right click, 然後properties(屬性) -> set launch options ( 進入遊戲設定) -> 加上:
+sv_lan  1 +sv_allow_lobby_connect_only 0

咁就得!

如果係用non-steam 就加個shortcut-> right click 內容 -> 係"目標"上 加插
+sv_lan  1 +sv_allow_lobby_connect_only 0 :

以下為sample:
"D:\Steam\steamapps\Common\left 4 dead 2\left4dead2.exe" +sv_lan 1 +sv_allow_lobby_connect_only 0

RDiver

俾你個msn我, 我嘗試幫幫你!