Step 1 Click on Start and then click Run.

Step 2 Windows NT, 2000, and XP users type in cmd and press Enter (or click OK).

Step 3 Once the window opens, you’ll need to do a special ping. Use the following syntax:

ping [url] [-f] [-l] [MTU value]

Example: ping yahoo.com -f -l 1472

You should start at 1472 and work your way down by 10 each time. Once you get a reply, go up by 2 until you get a fragmented packet. Take that value and add 28 to the value to account for the various TCP/IP headers. For example, lets say that 1452 was the proper value, the actual MTU size would be 1480, which is the optimum for the network we’re working with (1452+28=1480).

Once you find your MTU, you can now configure your router with the proper MTU size.

1. Check the router’s fan and radiator, if broken, re-bar to buy a new router.

2. To place the router into the air circulation.

3. Reduce the surface temperature of the router, you can get some ice on the surrounding.

In a typical configuration of a DMZ for a small company, a separate computer (or host in network terms) requests from users to access private network of web sites or other undertaking is open to the public. The DMZ host then initiates sessions for these requests on the public.
can, however, is the DMZ host does not log in to the private network. You can only packets that were requested.

The public network users outside the company can access the DMZ host. The DMZ usually include information on Web pages, so that it can be covered with the outside world. However, the zone does not allow access to data from another company. When an external user in the DMZ hosts security, Web pages can be damaged, but no information about the society of those suspended. D-Link, a leading manufacturer of routers, a company that sells products for the creation of a demilitarized zone.

For the D-Link DI-514, DI-524, DI-604 (US only), DI-614+, DI-624, DI-704P(revC), DI-754, DI-764, DI-774, and DI-784:

Step 1: Open a web browser like Internet Explorer and enter the IP address of the router (192.168.0.1). Enter the name admin () and password blank ().

Step 2: Click Advanced, then Firewall.

Step 3: Create a rule in the firewall: Click Enabled.
Enter a name (ftp).
Click Allow.

Source of this page, select the WAN interface. In the first field, enter an *. Leave the second box empty.
Depending on the destination, choose the LAN interface. Enter the IP address of the computer on the FTP server. Leave the second box empty.

Under the Protocol, select TCP. In the beach areas of Port, type 20 in the first zone and 21 in the second box.

Step 4: Click Apply and then Continue to save settings.

Another alternative is to contact your ISP and purchase extra IP addresses for each additional computer.

Here for a list of D-Link Routers : http://www.dlink.com/solutionFlashes/?type=1&rid=64

step1: Enter : http://support.dlink.com/Emulators/dir655/,Choose a dir-655 image you want to see.

step 2: Enter the login button ,username is Admin,password is Blank.

step 3: After you enter the  login button,you can see the D-Link dir-655 web control management.

Step 1: Log into the web-based configuration by typing in the IP address of the router (default:192.168.0.1) in your web browser. Select Admin as the username and type in your password. Leave blank if you have not created or changed your password.

Note: The address 192.168.0.1 is NOT on the Internet. The web-based configuration is built-in to the router.

If the router is already online, you will be taken to the STATUS page after logging in. If this is the case, the router is connected and you do not need to continue with this FAQ.

Step 2: Click the Setup tab and then click Internet on the left side.

Step 3: Click on the Manual Configure button.

Step 4: Select PPPoE (username/password) from the My Internet Connection is drop down menu and enter the following settings:

# Address Mode: Select the Dynamic IP radio button, unless your ISP (Internet Service Provider) supplied you with a static IP address.
# Username and Password: Enter the username and password your ISP gave you. In most cases your username is the same as your email address provided by your internet provider (example: yourname@yourisp.com).
# Reconnect Mode: Should be set to On Demand
# MTU and Maximum Idle Time: Should be left at the defaults (MTU: 1492 / Maximum Idle Time: 20) unless specifically instructed otherwise by your ISP.

Step 5: Click on the Save Setting button to save the changes.

If you are connected to the Internet; your Cable Status and Network Status will say Connected,you will have an IP Address, Subnet mask, Default Gateway, Primary DNS Server and Secondary DNS Server. If you do not, click on the Renew Button.

Step 6: Click on Status tab and Device Setting on the left side.

Step 2: The default username is admin (all lower case) and the default password is blank (nothing). Click on OK.

Step 3: Click on the Setup tab at the top and then click on Wireless Settings on the lefthand side.

Step 4: From the Wireless Security Mode dropdown menu, select WPA-Personal encryption.

Step 5: From the WPA Mode dropdown, Under WPA, select the form of WPA you would like to use.

Use WPA or WPA2 mode to achieve a balance of strong security and best compatibility. This mode uses WPA for legacy clients while maintaining higher security with stations that are WPA2 capable. Also the strongest cipher that the client supports will be used.

For best security, use WPA2 Only mode. This mode uses AES(CCMP) cipher and legacy stations are not allowed access with WPA security.

For maximum compatibility, use WPA Only. This mode uses TKIP cipher. Some gaming and legacy devices work only in this mode. To achieve better wireless performance use WPA2 Only security mode (or in other words AES cipher).

Step 6: In the Pre-Shared Key box, enter the desired Pre-shared key.

This is the “password” that allows communication between you’re encrypted client (e.g. the PSP or your wireless computer) and the encrypted wireless signal coming from the router. This password must contain at least 8 characters, the characters can be anything you can create from your keyboard.

Step 7: Click on Save Settings to save your settings.

Step 2: Enter the username (admin) and password (blank by default), and then click Ok or Log In .

Step 3: Click the System Tab on the left pane.

Step 4: Click Restore Factory Defaults under System Settings.

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 the Advanced tab at the 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.

For DI-704P (rev.B), DI-707P, DI-714P+, DI-804HV, DI-808HV, and DI-824VUP users:

Step 1: Open a web browser and enter the IP address of your router (192.168.0.1). Enter admin for your username and then your password (blank by default).

Step 2: Click on the Advanced tab and then Virtual Server on the left side.

Step 3: Enter the following information:

* Check the box next to Enable.
* Next to Service Ports, enter the port or range of ports you want to open.
* Next to Service IP, enter the IP address of the computer you want to open the port to.
* Click Always next to Schedule or enter the time frame that you want.

Step 4: Click Apply and then click Restart to save your changes.

For DI-704, DI-704P (rev. A), DI-707, DI-711, DI-713, and DI-713P users:

Step 1: Open your web browser and enter the IP address of the router (192.168.0.1). Enter user name (admin) and your password (blank by default). If there is only 1 box, enter admin.

Step 2: Click on Advanced at the bottom and then click Virtual Server.

Step 3: Create a new entry:

* Enter the port or range of ports you want to open in the box under Service Ports.
* Enter the IP address of the computer you want to open the ports to.
* Check the box under Enable.

Step 4: Click Save and then click Reboot.