Instructions
Go to "Settings" on the XMB, then select "Network Settings." Select "Internet Connection Settings," then select "Yes" when you get a prompt indicating that you'll be disconnected from the Internet.
Select "Custom," then adjust Wireless/WLAN settings if necessary. Select "Automatic" for every option. At the "IP Address Setting" screen, select "Manual."
Enter two IP addresses, corresponding to your router's subnet. These can be any IP addresses, so long as they are not in use by any other devices on your network. The gateway address is the address corresponding to the router.