我找到方法了
在C:\Program Files\Steam\steamapps\common\left 4 dead下
建立left4dead.exe的捷徑
在目標打"C:\Program Files\Steam\steamapps\common\left 4 dead\left4dead.exe" -ip (你的vlan ip)
如我的vlan ip是192.168.65.73
就在"C:\Program Files\Steam\steamapps\common\left 4 dead\left4dead.exe" 後打 -ip 192.168.65.73
e.g "C:\Program Files\Steam\steamapps\common\left 4 dead\left4dead.exe" -ip 192.168.65.73