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الموضوع: How to Make your Computer Accessible from the Public Internet ?

  1. #1
    تاريخ التسجيل
    Jun 2007
    مقالات المدونة
    معدل تقييم المستوى

    Lightbulb How to Make your Computer Accessible from the Public Internet ?

    Making your Computer Accessible from the Public Internet

    A video tutorial series for troubleshooting remote access to server-based applications

    This is a video tutorial-based resource page for anyone wanting to make their computer accessible to the public Internet.
    What you need to do to allow connections to your computer:

    1. Make your router forward connections to the computer
    2. Set up your firewall so it does not block connections
    3. Address and connect to your PC

    Make Your Router Forward Connections to the Computer

    Router and NAT configuration by port forwarding

    For most people, their NAT router is the biggest stumbling block to getting connections to their server-based application. This tutorial will teach you why that is the case, and what options there are for getting around it, including UPnP and port forwarding. Read the video text here.

    Additional Resources:

    • Instructions for port forwarding on almost any router ever made, along with detailed information about most of the other topics covered on this page.
    • A list of common port numbers
    • Is UPnP enabled on your router? Log in to your router similar to if you were going to port forward (shown in the tutorial). Look for UPnP settings under headings such as UPnP, Applications, Port Forwarding, or Virtual Server. Once found, you can enable UPnP from there. Remember, if your router doesn't have a UPnP setting, you will have to port forward.

    Set Up Your Firewall So It Does Not Block Connections

    Configuring your system and third-party firewalls

    It is a firewall's job to question any incoming request to your computer. Therefore, it is up to you to tell your firewall which requests are legitimate. This tutorial will remind you where all your firewalls are, and will give basic instructions on how to create exceptions for your application in those firewalls. More detailed firewall resources are listed below. Read the video text here.

    Additional Resources:
    For Windows OS Firewalls:

    For Mac OS Firewalls:

    For Third-Party Firewalls: Below are links to several personal firewall applications. While it is clearly not a comprehensive list, you can find many resources online by searching the firewall's website and checking their support files or contacting them directly for help creating a rule.

    Address and Connect to Your PC

    Handling static and dynamic IPs, and domain names

    Do you know how often your IP address changes? If you don't know the answer, you need to find out. The answer should be never—if you want your server-based application to receive connections. This tutorial explains what a static IP is, and how to get one. Read the video text here.

    Additional resources:

    Some VoIP applications use a method called STUN to keep a line of connection open. This tutorial explains what STUN is, and how much control you have over it. Read the video text here.

    Hairpinning Issues with STUN Note that sometimes when testing your IP from within your network you may not be able to connect to it. This just means your router does not 'hairpin' packets. To connect to the server from within your own network you need to use the private IP address (and private port) of that server. From outside the network though (i.e. across the Internet) you can use your public IP address (and public port) to access it.

  2. #2
    تاريخ التسجيل
    Jun 2007
    مقالات المدونة
    معدل تقييم المستوى


    Using TZO DDNS and Port Forwarding with most Linksys Cable / DSL Routers
    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 router with TZO, and setting the router to forward some popular ports to run a web, ftp and remote desktop server on your local area network. Keep in mind that most of the newer linksys routers (as of 2004) have similar setup screens for DDNS and Port forwarding (Applications and Gaming section)
    TZO Dynamic DNS code is integrated into most of the Linksys wired and wireless routers. 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 signup with a FREE 30 day trial of TZO DDNS using your browser. We will then show you how to login to your Linksys Cable/DSL router and perform DDNS and Port forwarding setups. 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.

    STEP 1)
    Signup with TZO Dynamic DNS (DDNS)
    You now need to sign up for a free DDNS trial (Dynamic DNS) using TZO.
    Go to http://LINKSYS.TZO.COM in your browser and you will see a screen similar to below:

    The TZO.COM Linksys signup screen - Click TRY TZO FREE to get a free 30 day trial

    Step 2) Click the TRY TZO FREE link at the top of that page as shown above and it brings you to the Linksys free trial signup page at TZO.COM as shown in the screenshot below. Enter your Email Address and your trial domain name and continue on to the next step:

    The TZO.COM Linksys signup screen asks for your domain name and email address to signup

    Step 3) Click the CREATE MY FREE TRIAL DOMAIN NAME at the bottom of the page as shown above. TZO will now send you an email. Check your email to obtain your TZO Trial information. Your email will contain a TZO Key, your domain selected, and the email address you used to signup. We now need to log into the Linksys router and enter the information under DDNS.

    The menu of the Linksys WRT54G cable and DSL router (Click to Enlarge)
    You should now log into your router using the admin username and password. In order to login, you need to go to in your browser. This is the default IP of the Linksys router. * Keep in mind that you can only do this when you are attached to the router. Logging into the router will not work from a remote location. Once you reach the router, you will be asked for a username and password. The default username is blank, and the password is admin. If you cannot get into the router, contact your system admin or ISP for password information. TZO will not know your router username or password if it has been changed from the defaults.

    When you login to the router, you first need to setup the TZO DDNS. Once you log into the router, you will see the screenshot similar to the one shown below. Click the DDNS link (shown circled in the bottom left of the menu bar)

    The main menu of the Linksys Router - The DDNS menu link shown circled in red
    STEP 5) Enabling TZO DDNS : Putting your TZO account information into the router:
    Now that you have signed up at the TZO.COM Linksys signup page you will receive an email with your TZO trial information. You now need to copy and paste the information from the TZO Trial email into the DDNS section of the router. Below are 5 steps you need to get 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 or MYNAME.TZO.COM)
    5) Check your settings and then click the SAVE SETTINGS button to save

    The DDNS screen of the Linksys Cable/DSL Router showing TZO.COM enabled
    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 OPERATION COMPLETE if the login worked. If the status says something different, double check your settings and try again. In this example, The domain name has been updated with the IP - which is the IP address dynamically assigned by our cable modem ISP. In this example, the IP is blank, Your IP will show up where IP ADDRESS is shown, and that will be the current IP address in the TZO DDNS Servers.
    STEP 6) Enabling Port Forwarding so you can run popular applications:
    Now that you have enabled TZO.COM DDNS in your Linksys router, you have solved the Dynamic IP problem and have a domain name that acts just like a static IP. You now need to use the APPICATIONS and GAMING page to setup port forwarding. As shown circled in red in the screenshot below, click the APPLICATIONS and GAMING link and continue to step 7

    The main menu of the Linksys WRT54G - Applications and Gaming link shown circled
    STEP 7) Enabling Port Forwarding:
    Now that you have entered the APPLICATIONS and GAMING section, you should determine the ports you need to forward. In this example, we have our server set to a static internal LAN IP of - so we need to forward all the ports needed to this server. We are going to run a web server using port 80, an FTP server that uses port 20 and 21, and a Remote Desktop server that uses port 3389.

    In this case below, you will see port 80, 81 (used if port 80 is blocked), 20, 21, and 3389 all pointing to the server at our internal IP of

    You should do the same for your ports depending on what server(s) you wish to run. If your ISP blocks port 80, port 8, 82, 83 etc are good ports to use as an alternate. In this case shown below, we opened port 81 just incase our ISP blocks port 80, we won't have to add the port in the router at a later date.

    The APPLICATIONS and GAMING screen of the Linksys WRT54G showing ports forwarded)
    After you configure all the ports to the proper IP Address, then click the SAVE SETTINGS button. The sets the router to forward the proper ports to your servers. To add other applications, you need to know the port(s) and then you need to set the server up on your LAN and set the proper IP address.

    Once you set the ports up, run your server(s) and have your friend try out your domain name in their browser! It's that easy. Keep in mind that when you are tesing the servers with your domain name, please do so from a remote location. If you are testing internally (using the same network as the server) use the INTERNAL IP address since most routers have problems using the domain name when on the same network as the server.

    If you have trouble with ports, and want more information, you can see and you should also check out Shield's Up, a personal security Website at

    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

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