用的是DI－524 router，打开电骡之后，显示的是低ID，心里那个闹心啊。开始一通胡骨狗。了解点了症状所在。把XP，ZoneAlarm的相应端口（port）打开，还是不行。只能对router下手了。拿出随货寄来的光盘：Wireless G Router，打开相应的DI524 manual找到了一节有关的问题：
How do I open ports on my router?
To allow traffic from the internet to enter your local network, you will need to open up ports or the router will block the request.
Step 1 Open your web browser and enter the IP Address of your D-Link router
(192.168.0.1). Enter username(admin) and your password(blank by default).
Step 2 Click on Advanced on top and then click Virtual Server on the left side.
Step 3 Check Enabled to activate entry.
Step 4 Enter a name for your virtual server entry.
Step 5 Next to Private IP, enter the IP Address of the computer on your local
network that you want to allow the incoming service to.
Step 6 Choose Protocol Type - either TCP, UDP, or both. If you are not sure, select both.
Step 7 Enter the port information next to Private Port and Public Port. The private and public ports are usually the same. The public port is the port seen from the WAN side, and the private port is the port being used by the application on the computer within your local network.
Step 8 Enter the Schedule information.
Step 9 Click Apply and then click Continue.
Note: Make sure DMZ host is disabled. If DMZ is enabled, it will disable all Virtual Server entries.
Because our routers use NAT (Network Address Translation), you can only open a specific port to one computer at a time. For example: If you have 2 web servers on your network, you cannot open port 80 to both computers. You will need to configure 1 of the web servers to use port 81. Now you can open port 80 to the first computer and then open port 81 to the other computer.