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Using TZO with Linksys Cable / DSL Router BEFSR41 Version 3
Many users with Cable and xDSL broadband connections are using hardware routers such as the Linksys Cable/DSL Routers to connection their local area network to the Internet. This tutorial explains how to configure your Linksys BEFSR41 V3 router with TZO, and setting the router to run a mail and web and FTP server on your local area network.
  A hardware router offers a simple, easy to use and reliable way to share your broadband Internet connection with the rest of your network. These hardware routers are easier to set up than a PC acting as a NAT/Gateway, and they are often more reliable, since a PC has many points of failure, such as a hard disk, network card, power supply, RAM, etc, where the Linksys hardware router has a single point of failure.
  TZO Dynamic DNS technology is integrated into the Linksys Router model BEFSR41 V3 - the latest version of this great selling Linksys router - firmware version 1.04.8 (6/20/03). The router WAN (Wide Area Network - or Internet) IP address is typically the only USEABLE address on the router, and this is the IP address that gets published in the TZO Dynamic DNS system. Since this WAN IP is the incoming IP Address of the router, the router's PORTS need to be configured if you want to run a server. The router acts a NAT (Network Address Translator) and offers basic port filtering for security purposes. This port filtering also prevents you from running a web server, email server, or any other server like Internet Games, Netmeeting, etc.
  In the following tutorial, we give a basic overview of the Linksys Cable/DSL wireless router setup, and then we will show you how to sign up for a free 30 day trial of TZO and log into the TZO DDNS servers by using the router. We also show you how to open ports in the router. You can see other tutorials on the TZO Support page on running your own web server and email server, as well as other types of servers.
  Linksys Router status
  The Main Status Screen of the Linksys BEFSR41 V3 Cable/DSL Router (Click to Enlarge)
  When you set the Linksys router up, you need to configure the DDNS from TZO. This SETUP Screen shows the ROUTER NAME, DOMAIN NAME, and shows the FIRMWARE VERSION. Please note that you should see the Linksys Website or FTP Site to get the LATEST FIRMWARE, or see SmallNetBuilder for a great review and detailed information on most the Linksys Routers.
  STEP 1) Setup Screen:
Some ISP's require the router name and domain name, so you should leave this information blank or check with your ISP to determine what should be used in these areas. If you desire to change the router from the defaults, set the LAN IP, DHCP range, and then continue to step 2
  STEP 2) Signup with TZO DDNS Free 30 day trial:
You now need to set up DDNS (Dynamic DNS) using TZO. If you already have a trial or a TZO account, skip this step and go to step 3. To get a TZO free 30 day trial, enter your domain name selection and your email address and select the SIGN ME UP button as shown in the screenshot below. TZO will send your free trial key to the email address entered.


The TZO.COM Linksys signup screen at http://linksys.tzo.com - go here to sign up for a free 30 day trial for your Linksys routers

  STEP 3) DDNS Section: Enter your TZO DDNS information in the router:
You now need to enter your TZO account information into the DDNS section of the router. Once you signup at the TZO.COM Linksys signup page as shown above, you will receive an email with your TZO trial information. You now need to copy and paste the information from the TZO Trial email the DDNS section of the router. To get to the DDNS screen, click on the DDNS link in the menu under the APPLICATIONS and GAMING link. Once you reach the DDNS setup screen in the router, continue to step 4.
  STEP 4) Advanced Section: Putting your TZO account information into the router:
Once you signup at the TZO.COM Linksys signup page as described above, you will receive an email with your TZO trial information. You now need to copy and paste the information from the TZO Trial email to the DDNS section in the router as shown in the screenshow above. Follow along with the 5 steps below to DDNS working in the router.
  1) Select TZO.COM from the dropdown list under DDNS Service
2) Paste in the TZO Key into the PASSWORD field in the router
3) Paste in the Email address into the proper field
4) Type or paste in the Domain name into the proper field. (Full domain as in MYNAME.LINKSYSNET.COM, MYNAME.TZO.COM or MYNAME.COM if you have a premiere acct)
5) Check your settings and then click the APPLY button to save

After you have all of your TZO DDNS settings in the router and click the apply button, this should log your account in and set the IP. The STATUS should say DDNS IS UPDATED SUCCESSFULLY if the login worked. If the status says something different, double check your settings and try again. If the status line says DDNS IS CURRENTLY CLOSED as shown in the example above, then double check your account information and then try to save your settings again.
  DDNS screen showing TZO
  The Port Range Forwarding screen of the Linksys Cable/DSL Router showing ports forwarded (Click to enlarge)
  Once we get the router up and running and we can surf the web using one of the client PC's, we can start preparing the router to run a web server,ftp server and other servers. For information on running other types of servers, you need the Incoming PORT(s) of the desired service, and once you have the port(s), you can set the port as shown in the example above for Passive FTP (Port 20-21) and Web (port 80) as well as Telnet (23) SSL(443) and PCAnywhere (5631-5632). Once you decide what PC is going to run the web, ftp, email server, you need to forward the proper port to the proper Internal IP address of the server. For example:

- We have 1 PC on the internal network, using the IP address of

- This PC at has a Web, FTP and SMTP server, so in the example above, we set TCP port 80 to IP ADDRESS
- We have a FTP and SMTP Server as well, so these ports are also set to as shown above.

If you have trouble with the FORWARDING ports as shown above, you can set ONE PC to be a DMZ Host (See the DMZ Host screenshot shown below), which means that the router will totally expose ALL PORTS to this PC, offering NO Filtering at all. This would be a last resort for testing purposes, and is not recommended to leave a host exposed via DMZ.
  The DMZ section of the Port Forwarding Screens of the Linksys Cable/DSL Router (Click to enlarge)
  After you configure the ports to the proper IP Address, then click the apply button. The sets the router to forward the proper ports to your server. To add other applications, you need to know the Service Port(s) and then you need to set the server up on your LAN and set the proper IP address. If you want to use Microsoft NetMeeting on the IP Address of, you would forward the ports 1503 and 1720 to

Once you set the ports up, run your server(s) and have your friend try out your domain name in your browser! It's that easy.

If you have trouble with ports, and want more information, you can see http://www.PortDetective.com and you should also check out Shield's Up, a personal security Website at http://www.grc.com

These websites can help determine what ports you have open on the router, and Port Detective can even help you find out if your ISP blocks these ports as well. For more information on the Linksys cable and DSL router, please see the Linksys website at http://www.Linksys.com
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