# Frequently Asked Questions

What can I do if the specified installation procedure did not work?

1. Try unplugging the power supply of your cable or DSL modem then plugging it back in to reboot it.
2. Restore the factory default settings of the ADSL2+ Ethernet/USB Router. Press in and hold the Reset button for between 5 and 10 seconds. This will reset the ADSL2+ Ethernet/USB Router to the factory default settings. If you applied any personal configuration settings, you will need to make the changes again.

What type of firewall is the ADSL2+ Ethernet/USB Router equipped with?

The ADSL2+ Ethernet/USB Router uses a Stateful Packet Inspection firewall for protection from network intrusions, and NAT and TCP/IP port forwarding.

What is NAT?

Network Address Translation (NAT) translates multiple IP addresses on the private LAN to one public address that is sent out to the Internet. This provides security since the IP address of a computer on the LAN is not transmitted to the Internet. The user can have multiple private addresses behind the single address that was provided by the ISP.

What is DMZ?

DMZ stands for Demilitarised Zone. This feature allows one IP address to be exposed to the Internet. DMZ allows only one computer to be exposed when multiple TCP/IP ports need to be open.

If DMZ is used, does the exposed user share the public IP with the ADSL2+ Ethernet/USB Router?

No, all specific requests are forwarded to the DMZ host.

What should I do if I am unable to access my e-mail or the Web page of my ISP?

You should contact your ISP to get the full URL, then perform the following steps:

Note: Linux users can perform steps 4 and 5 after opening a terminal.

1. Connect your broadband modem directly to one of your computers.
2. Click Windows Start > Run.
3. In the Run dialog box:
   Windows XP, 2000, and NT Users: Type cmd.
   Windows Me, 98, and 95 Users: Type command.
4. Enter the following command: ping xxx, where xxx is the complete URL for your ISP.
5. After you get the IP address, enter the IP address in the mail server option or in the address line of your Web browser

What is the maximum number of users that the ADSL2+ Ethernet/USB Router will allow?

If you attach additional hubs and switches to the ADSL2+ Ethernet/USB Router, up to 253 separate users can connect to the ADSL2+ Ethernet/USB Router.

Is the ADSL2+ Ethernet/USB Router compatible across different platforms?

Any platform that supports Ethernet, Wi-Fi compatible 802.11b and 802.11g products, and TCP/IP is compatible with the ADSL2+ Ethernet/USB Router.

Will the ADSL2+ Ethernet/USB Router allow me to use my own public IPs and domain, or do I have to use the IPs provided by the ADSL2+ Ethernet/USB Router?

Only one valid Internet IP address is necessary. The internal IP address range will still go through the NAT firewall for all outbound Internet requests. All inbound requests will be blocked unless specific settings have been set up, such as port forwarding or DMZ.

Can I forward multiple ports at the same time?

Yes. You can forward up to 30 ports at the same time.

Is there a security log feature for the ADSL2+ Ethernet/USB Router?

Yes, there is a security log feature in the STATUS page of the Web User Interface.