Arris SURFboard SBG900 (49402201900) Modem Logo
Posted on Jul 30, 2008
Answered by a Fixya Expert

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No Internet Connection

I keep getting the error:

CAP unable to make C-NAPT mapping. No WAN IP address available,

Any suggestions on how to fix this problem would be appreciated. The modem is brand new.

2 Answers

Anonymous

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  • Posted on Jul 30, 2008
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First check internet line is working properly,before connecting to the wireless modem

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  • Posted on Apr 27, 2009
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Get better quality digital  T spliters, better qualitly coax R5 cables, replace all your sppliters connectors, ask cable company to get a direct line to their Tap box and make sure there is at max only one spliter before your modem and that the cable comming from their tap box is not longer that the necesary. 
regards.
im very impresed nobody post anything to you all this tieme.

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The router needs to be configured manually. Follow the steps below.

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Step 1

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After logging into the router select Setup. Set Internet Connection to 'PPPoE' option.
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Step 4

If your broadband modem does not have PPPoE function, select the 'PPPoE' option in the router and enter your account details (username and password given by your ISP). Note that some ISP's require username to be as your full e-mail address (ex: [email protected]).

Step 5

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If you are having difficulties accessing the Internet:

- Turn the modem and the router off for a minute and then turn the modem first and then the router.

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To configure your router for Cable you will need to set your router's WAN (INTERNET) port to 'Dynamic IP' (DHCP) option. The router is set to this option by default.

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When using NAT/PAT, keep in mind that the Internet-accessible servers are seen from the Internet as their NAT/PAT-ed IP address (the Public IP address) and not the local IP address (not the Private IP address). This understanding is very important when you or someone need to test connectivity to the server and/or when you need to create filter (access list or ACL for short) to allow only certain incoming traffic from the Internet and block others.

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Instruments used in this illustration are pretty much standard for running your own servers. Please note that IP addresses, username, and password are changed. However, you could always modify the configuration to suit your situation.

This sample configuration assumes that you have a block of IP from ISP. There is a dedicated Public IP address for the router WAN interface (the Dialer1 interface) and another dedicated Public IP address for the server PAT IP address. If you only have a single Public IP address for both router WAN interface and server PAT IP address, there are several ways to configure the router.

One way is to use the same command as shown in sample configuration.

view plaincopy to clipboardprint?
  1. ip nat source static tcp 10.10.10.2 21 1.1.1.14 21 extendable
ip nat source static tcp 10.10.10.2 21 1.1.1.14 21 extendable
This one configuration way is suitable when you have static IP address from your ISP and you know exactly what the IP address is. In this case you have the 1.1.1.14 single static IP address for both the WAN interface and Public server IP address.

When you are unsure which IP address you receive from the ISP, or when your Public IP address keep changing; then another way to configure the static PAT is following

view plaincopy to clipboardprint?
  1. ip nat source static tcp 10.10.10.2 21 interface Dialer1 21 extendable
ip nat source static tcp 10.10.10.2 21 interface Dialer1 21 extendable
With situation of dynamic IP address, at some point you still need to know the exact Public IP address you receive from your ISP for server connection testing and production time. To find out, you can issue show ip interface brief command on the router. You will then see the associated WAN interface Public IP address.
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  1. Open an Internet browser, and type http://192.168.0.1. If a "Configuration Assistant" appears immediately, then do not follow the rest of these instructions. Follow the Configuration Assistant instructions, instead. Once you are finished, test your Internet connection by browing online,
  2. Type admin for User Name, and password is blank. (do no type any thing for password.)
  3. Click OK. This logs you into the router.
  4. Click the Home tab and click the WAN button. Dynamic IP Address is the default value, however, if Dynamic IP Address is not selected as the WAN type, select Dynamic IP Address by clicking on the radio button. Click Clone Mac Address. Click on Apply and then Continue to save the changes.

that would fix your problem..
in case if yoy have any problem revert back with your internet service providers name.(isp).
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