Question about Arris SURFboard SBG900 (49402201900) Modem

2 Answers

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.

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First check internet line is working properly,before connecting to the wireless modem

Posted on Jul 30, 2008

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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.

Posted on Apr 27, 2009

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

Basic DSL Setup - PPPoE

Most Internet Service Providers offer PPPoE authentication. Please consult your ISP if you are not sure if PPPoE could be used.

To configure your router for PPPoE you will need to set your router's WAN (INTERNET) port to 'PPPoE' option. However majority of Modems nowadays already have PPPoE enabled. If your modem has PPPoE client built-in, you need to select the 'DHCP' option in your router. The router is set to this option by default.

Configuration steps:

Step 1

Connect the broadband modem to the WAN (INTERNET) port of your router. If the modem has USB connection make sure that it is NOT connected to any computers via the USB cable and that the modem is switched to Ethernet (not USB). Only the modem's Ethernet port should be connected to the router's WAN (INTERNET) port.
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Step 2

Open your Internet Explorer and log into your router by typing in its IP address (in most cases the default IP is http://192.168.1.1 ). Note that you do not have to be on the Internet in order to access this address because you are just connecting to your router's address. Specify username and password for your router, the default is `admin' (optional) and password is blank (nothing). Or password is admin also.

Step 3

After logging into the router select Setup. Set Internet Connection to 'PPPoE' option.
This can be done by either clicking on Internet Connection Setup Wizard or if you want to set it up manually, then click on 'Manual Internet Connection Setup'. Note that it is very common for broadband modems to carry out the PPPoE authentication for you. In this case you need to select the 'Dynamic IP' option (DHCP) in your router, do not select PPPoE. If you have such modem proceed to Step 5

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: username@ispname.com).

Step 5

Click on SAVE SETTINGS and then on REBOOT THE DEVICE to apply the new configuration. Recycle power to modem.

You do not have to run any login client (like PPPoE) on your computer in order to connect to the Internet. If you had it setup when using the modem without the router, disable it in Internet Explorer under Tools > Internet Options > Connections > set to 'Never dial a connection'.

If you did not have to run PPPoE login client on your computer when modem was directly connected to your PC, your ADSL modem has PPPoE built-in. In this case set the router's WAN (INTERNET) port should be set to the 'Dynamic IP' option.

If your ISP requires PPPoA connection you need to make sure that your ADSL modem supports PPPoA (PPPoA can not be used on Routers which do not have ADSL Modem built-in). If your modem will be carrying out PPPoA connection you need to set your router's WAN (INTERNET) port to the 'DHCP' option.


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.

- Log into the router and go to Status page. Note what IP address it is getting on the WAN (INTERNET) interface. If the IP address you see under WAN (INTERNET) appears to be in the same range you are using on your network (e.g. 192.168.0.x), you will need to change the range you are using on your LAN to something different, e.g. 192.168.88.x. You can do this on your router under Setup > LAN Setup. Note that after changing the IP of your router you will only be able to access it through its new IP, e.g. 192.168.88.1.

- Select the MAC Cloning option. Click on Clone MAC Address button. Do this from the computer which the broadband modem was directly connected to the last time. This will place the MAC address of your computer into the router. Save settings and reboot the router. Reboot your broadband modem as well.

- Uninstall your antivirus software (sometimes disabling or closing the software is not enough) and reboot your PC.







Configuring router for Cable Internet

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.

Configuration steps:

Step 1 Connect the cable modem to the WAN (INTERNET) port of your router. If the modem has USB connection make sure that it is NOT connected to any computers via the USB cable and that the modem is switched to Ethernet (not USB). Only the modem's Ethernet port should be connected to the router's WAN (INTERNET) port.
Connect your computer(s) to the router's LAN port(s) or establish connection to it wirelessly.

Step 2 Open your Internet Explorer and log into your router by typing in its IP address (in most cases the default IP is http://192.168.1.1 ). Note that you do not have to be on the Internet in order to access this address because you are just connecting to your router's address. Specify username and password for your router, default is `admin' and password is blank (nothing). Or password is admin as well.

Step 3 After logging into the router select Setup. Set Internet Connection to 'Dynamic IP (DHCP)' option.
This can be done by either clicking on Internet Connection Setup Wizard or if you want to set it up manually, then click on 'Manual Internet Connection Setup'.

Step 4 Click on SAVE SETTINGS and then on REBOOT THE DEVICE to apply the new configuration.

If you are having difficulties accessing the Internet, you need to:

- Select the MAC Cloning option. Click on Clone MAC Address button. Do this from the computer which the cable modem was directly connected to the last time. This will place the MAC address of your computer into the router. Save settings and reboot the router. Reboot your cable modem as well.

- Log into the router and go to Status page. Note what IP address it is getting on the WAN (INTERNET) interface. If the IP address you see under WAN (INTERNET) appears to be in the same range you are using on your network (e.g. 192.168.0.x), you will need to change the range you are using on your LAN to something different, e.g. 192.168.88.x. You can do this on your router under Setup > LAN Setup. Note that after changing the IP of your router you will only be able to access it through its new IP, e.g. 192.168.88.1.

- Uninstall your antivirus/firewall software (sometimes disabling or closing the software is not enough) and reboot your PC. After establishing the Internet connection through the router, reinstall your antivirus/firewall software.

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Setup'.

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- Log in to the router and go to Status page. Note what IP address it is getting on the WAN (INTERNET) interface. If the IP address you see under WAN (INTERNET) appears to be in the same range you are using on your network (e.g. 192.168.0.x), you will need to change the range you are using on your LAN to something different, e.g. 192.168.88.x. You can do this on your router under Setup > LAN Setup. Note that after changing the IP of your router you will only be able to access it through its new IP, e.g. 192.168.88.1.

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Just a bit of explanation. E0 interface is for inside network (LAN interface). E1 is for outside (ISP or WAN physical interface). Dialer1 is for PPPoE (the "actual"/logical WAN interface). The 1.0.0.13 is ISP provided static IP address for the use of the server. This configuration example is for running FTP server, which uses the standard TCP port 20 and 21.

The LAN uses 10.10.10.0 network with 255.255.255.0 subnet for both servers and workstations. All servers within the LAN use static IP address. The router is configured as DHCP server to give out IP info (IP addresses, subnet mask, DNS) to workstations that are configured as DHCP client.

Basically I suggest that you deploy NAT (Network Address Translation) and PAT (Port Address Translation) to setup your own servers behind Cisco router. The NAT is used to translate the ISP's given static IP address to your local IP address. The PAT is used to translate TCP ports (the port 20 and 21) between the two IP addresses.

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.

Side Note:
For more info on NAT/PAT concept, check out the following FAQ
»Cisco Forum FAQ »NAT and PAT; Introduction and Implementations

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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