Inde på den her:
http://boardsus.playstation.com/playstation/NetworkAdaptorFAQ#What_is_port_forwarding_How_do_I står der: If you intend to use port forwarding or the DMZ host feature to enable your online games, you need to know your IP address.
When you use the utility disk that comes with the Network Adaptor to configure your online settings, you are allowed to select either a manual method or an automatic method to obtain IP address and other network settings. If you used the manual method, you would know your address, because you picked it yourself. If you used the automatic method, the PS2 uses a system known as DHCP (Dynamic Host Configuration Protocol).
DHCP sends a special type of network broadcast request which searches for a DHCP server on your home network. Typically a home broadband firewall/router also includes a DHCP server as a standard feature. This server (the router) will give your PS2 an available IP address and other network settings which are appropriate for your particular network. Normally users don't need to know what settings were actually applied by the DHCP server, but to use the port forwarding or DMZ host features you will need to know the IP address.
When you use the 'automatic' method, there will be a few additional questions which are asked. One question is whether you need a username or password (if you have a router you should always indicate that you do not use a username & password). It will also ask if you want to define the IP addresses for your DNS servers (you can if you know what they are, but it's usually safe to say 'no'). Finally it will ask if you want to define a hostname for your PS2. Go ahead and give your PS2 a hostname. Pick something easy and obvious such a 'PS2'.
Your PS2 will not acquire an IP address (at all) if it does not need to go online. This means you will probably not be able to find an address unless you have gone online (or at least tried to go online) recently (most DHCP servers will "remember" your system for at least 1 day and often much longer).
Assuming you've set up your PS2 for 'automatic' network configuration and have gone online, you are ready to find your IP address. There are a number of ways to find it. I will explain two of them.
The easiest way to find it is to use the DHCP server which assigned the address... your router. Using a web browser, surf to the IP address of your router. The URL is always the IP address of the router. Goto
http://192.168.0.1 or
http://192.168.1.1. If neither of these work, consult your router's User's Guide to help you find it (it's usually very near the front).
Using the router, find the page which configures your router's DHCP server settings. Often routers will have a table which displays the "DHCP Client List". Sometimes the table is displayed on the DHCP setup page.
Look through the clients listed in the table (there will usually be just a few of them). You are looking for a MAC address (a.k.a. Physical address, a.k.a. Hardware address) which begins with 00-04-1f-.... That entry is your PS2. Just cross-reference to find the IP address assigned.
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