Product FAQ


General FAQ

  1. What is the ZyAIR G-4100 Internet Access Sharing Router?
  2. What is the coverage range of ZyAIR G-4100?
  3. What is the range coverage of  ZyAIR B-100/B-200/B-300/B-400?
  4. What can I do if I lost the password for my ZyAIR G-4100 and can't access it's configuration any more?
  5. How do I used the reset button, more over what field of parameter will be reset by reset button?
  6. Why can't I configure B-100/B-200/B-300 with the supplied utility in Windows XP?
  7. What are 802.1x authentication type and which authentication type does ZyAIR G-4100 802.1x embeded server support.
  8. What do I need to use the ZyAIR G-4100?
  9. What is PPPoE?
  10. How does the ZyAIR G-4100 support TFTP and FTP?
  11. How do I know I am using PPPoE?
  12. Why does my provider use PPPoE?
  13. How can I manage the ZyAIR G-4100 ?
  14. What network interface does the ZyAIR G-4100 support?
  15. What can we do with ZyAIR G-4100 ?
  16. Does ZyAIR G-4100 support dynamic IP addressing?
  17. What is BOOTP/DHCP?
  18. What is the difference between the internal IP and the real IP from my ISP?
  19. What DHCP capability does the ZyAIR G-4100 support?
  20. What is the maximum number of wireless client can associated with ZyAIR B4000 simultaneously?

Advanced FAQ

  1. What is the default antenna type and gain on ZyAIR G-4100?
  2. Can I change the antenna on ZyAIR G-4100?
  3. What are the connector type required on the replacement antenna?
  4. What is the RF power output of ZyAIR G-4100?
  5. What wireless security mechanism are supported by ZyAIR G-4100?
  6. What is Open System and Shared Key of Authentication?
  7. What Authentication Type does ZyAIR G-4100 support?
  8. Why is the supplied utility for B-100/B-200/B-300 keep on prompting "Invalid WEP key length" when I try to save my WEPconfiguration and I am sure the configuration is correct?
  9. How does the ZyAIR G-4100 support TFTP and FTP?
  10. How fast can the data go? 
  11. My ZyAIR G-4100 can not get an IP address from the ISP to connect to the Internet, what can I do?
  12. How do I make VPN client x work through my ZyAIR G-4100 ?
  13. What is DDNS?
  14. When do I need DDNS service?
  15. What DDNS servers does the ZyAIR G-4100 support?
  16. Can the ZyAIR G-4100's SUA handle IPsec packets sent by the IPsec gateway?

1. What is the ZyAIR G-4100 Internet Access Sharing Router?

The ZyAIR G-4100 hot Spot Gateway combines an 802.11g Wireless Access Point, Router, 4-port switch and service gateway in one box. An 'Exclusive Printer' connects directly to the ZyAIR, allowing you easily print subscribers statements. The ZyAIR G-4100 is ideal for offices, coffee shops, libraries, hotels and airport terminals catering to subscribers that seek Internet access. You should have an Internet account already set up and have been given usernames, passwords etc. required for Internet access.

2. What is the coverage range of ZyAIR G-4100?

The coverage range typically is 50m~80m indoor, 150m~300m outdoor.  The actual range may very depends on environment, as to obstacles  and walls, RF interference, etc  in the environment.

3. What is the range coverage of  ZyAIR B-100/B-200/B-300/B-400?

The coverage range typically is 50m~80m indoor, 150m~300m outdoor.  The actual range may very depends on environment, as to obstacles  and walls, RF interference, etc  in the environment.

4. What can I do if I lost the password for my ZyAIR G-4100 and can't access it's configuration any more?

If you have lost the password there is no way to gain access to the device except to reset the device by pressing the reset button located beside the power jack.

5. How do I used the reset button?  Moreover what field of parameter will be reset by reset button?

You can used a sharp pointed object insert it into the little reset hole beside the power connector.

The procedures to reset the unit is as follow

  1. Used a sharp pointed object insert it into the little reset hole beside the power connector.
  2. Press down the reset button, the unit will be reset . 

Note: When the reset button is pressed all parameters will be reset back to factory default including ESSID, password, IP address, WEP Keys.

The basic default configuration after reset is as follow.

  1. IP address default: 192.168.1.1
  2. Password default: 1234
  3. ESSID default: Wireless
  4. WEP:disabled

6. Why can't I configure B100/B200/B300 with the supplied utility in Windows XP?

This is because XP uses it's default configuration for wireless adapter. You can disable it by entering Control Panel->Network and Dialup Connections->Wireless network connection->Advance and uncheck the use Windows to configure wireless configuration check box and click OK. Now you need to exit the supplied configuration utility in the Windows task bar and restart it again. Now you can use the supplied utility to configure your B-100.

7. What is the default user name and password to login the G-4100 via the browser?

To restrict only the administrator can configure the router, there is a login procedure prompted for asking User Name and Password. The default User Name is 'admin' and the default password is the default SMT password, '1234'.

8. What do I need to use the ZyAIR G-4100?

You need a ADSL modem or cable modem with an Ethernet port to use the ZyAIR G-4100. The ZyAIR G-4100 has two types of Ethernet ports: LAN port and WAN port. You should connect the computer to the any of the 4 port LAN switch and connect the external modem to the WAN port. If the ISP uses PPPoE Authentication you need the user account to enter in the ZyAIR G-4100.

9. What is PPPoE?

PPPoE stands for Point-to-Point Protocol Over Ethernet that is an IETF draft standard specifying how a computer interacts with a broadband modem (i.e. xDSL, cable, wireless, etc.) to achieve access to the high-speed data networks via a familiar PPP dialer such as 'Dial-Up Networking' user interface. PPPoE supports a broad range of existing applications and service including authentication, accounting, secure access and configuration management. There are some service providers running of PPPoE today. Before configuring PPPoE in the G-4100, please make sure your ISP supports PPPoE.

10. Does the ZyAIR G-4100 support PPPoE?

Yes. The ZyAIR G-4100 supports PPPoE.

11. How do I know I am using PPPoE?

PPPoE requires a user account to login to the provider's server. If you need to configure a user name and password on your computer to connect to the ISP you are probably using PPPoE. If you are simply connected to the Internet when you turn on your computer, you probably are not. You can also check your ISP or the information sheet given by the ISP. Please choose PPPoE as the encapsulation type in the ZyAIR G-4100 if the ISP uses PPPoE.

12. Why does my provider use PPPoE?

PPPoE emulates a familiar Dial-Up connection. It allows your ISP to provide services using their existing network configuration over the broadband connections. Besides, PPPoE supports a broad range of existing applications and service including authentication, accounting, secure access and configuration management.

13. How can I manage the ZyAIR G-4100 ?

14. What network interface does the ZyAIR G-4100 support?

The ZyAIR G-4100 supports 4 port auto MDX/MDIX 10/100M Ethernet  switch to connect to the computer and 10/100M Ethernet to connect to the external cable or ADSL modem..

15. What can we do with ZyAIR G-4100 ?

Browse the World Wide Web (WWW), send and receive individual e-mail, and download software. These are just a few of many benefits you can enjoy when you put the whole office on-line with the ZyAIR G-4100 Internet Access Sharing Router.

16. Does ZyAIR G-4100 support dynamic IP addressing?

The ZyAIR G-4100 supports either a static or dynamic IP address from ISP.

17. What is BOOTP/DHCP?

BOOTP stands for Bootstrap Protocol. DHCP stands for Dynamic Host Configuration Protocol. Both are mechanisms to dynamically assign an IP address for a TCP/IP client by the server. In this case, the ZyAIR G-4100 Internet Access Sharing Router is a BOOTP/DHCP server. Windows base clients use DHCP to request an internal IP address, while WFW and WinSock clients use BOOTP. TCP/IP clients may specify their own IP or utilize BOOTP/DHCP to request an IP address.

18. What is the difference between the internal IP and the real IP from my ISP?

Internal IPs are sometimes referred to as virtual IPs. They are a group of up to 255 IPs that are used and recognized internally on the local area network. They are not intended to be recognized on the Internet. The real IP from ISP, instead, can be recognized or pinged by another real IP. The ZyAIR G-4100 Internet Access Sharing Router works like an intelligent router that routes between the virtual IP and the real IP.

19. What DHCP capability does the ZyAIR G-4100 support?

The ZyAIR G-4100 supports DHCP client on the WAN port and DHCP server on the LAN port. The ZyAIR G-4100's DHCP client allows it to get the Internet IP address from ISP automatically. The ZyAIR G-4100's DHCP server allows it to automatically assign IP and DNS addresses to the clients on the local LAN.   

20. What is the maximum number of wireless client can associated with ZyAIR G-4100 simultaneously?

We did not limit the number of wireless client can associated with ZyAIR G-4100 simultaneously, the suggest number are no more than 32, a good number is under 10 to ensure the performance of each wireless client.


Advanced FAQ

1. What is the default antenna type and gain on ZyAIR G-4100?

The ZyAIR G-4100 are equip with 2 diversity omni directional antenna with 2 dBi Gains.

2. Can I change the antenna on ZyAIR G-4100?

Yes, you can change the antenna on  ZyAIR G-4100 to fit your implementation needs.  To change antenna you must remove it first. You can remove the antenna by holding the outer ring of the antenna and turn it counter clock wise, and firmly remove the antenna from the ZyAIR G-4100.  To install it simply reverse the removing procedure.

3. What are the connector type required on the replacement antenna?

ZyAIR G-4100 are equip with Reverse Polarity SMA jack, so it will work with any 2.4Ghz wireless antenna with Reverse Polarity SMA Plug.

4. What is the RF power output of ZyAIR G-4100?

The output of ZyAIR G-4100 is 18.1dBm or 65mW from the RF module.

5. What wireless security mechanism are supported by ZyAIR G-4100?

ZyAIR G-4100 supports below security mechanisms.

  1. 64bit/128bit WEP (Wired Equivalent Privacy).
  2. WPA Authentication.

6What is the Open System and Shared Key Authentication?

Open System:
The default authentication service that simply announces the desire to associate with another station or access point. A station can authenticate with any other station or access point using open system authentication if the receiving station designates open system authentication.
Share Key:
The optional authentication that involves a more rigorous exchange of frames, ensuring that the requesting station is authentic. For a station to use shared key authentication, it must implement WEP.

7. What Authentication Type does ZyAIR G-4100 support?

ZyAIR G-4100 support null authentication when WEP is disabled as specified by IEEE 802.11b standard, and when WEP is enabled it is using shared key authentication and data are encrypted at the same time.

8. Why is the supplied utility for B-100/B-200/B-300 keep on prompting "Invalid WEP key length" when I try to save my WEP configuration and I am sure the configuration is correct?

Please make sure all 4 set of keys are with correct and WEP key length are also correct. Do not leave any key field blank. 

Note: Please make sure all 4 set of keys are consistent with the 4 set of keys configured in AP.

9. How does the ZyAIR G-4100 support TFTP and FTP?

In addition to up load the firmware or configure via web GUI, you can also use TFTP or FTP to do so.

10. How fast can the data go? 

The speed of the cable modem is only one part of the equation. There are a combination of factors starting with how fast your PC can handle IP traffic, then how fast your PC to cable modem interface is, then how fast the cable modem system runs and how much congestion there is on the cable network, then how big a pipe there is at the head end to the rest of the Internet.

Different models of PCs and Macs are able to handle IP traffic at varying speeds. Very few can handle it at 30 Mbps. 

Ethernet (10baseT) is the most popular cable modem interface standard for the PC. This automatically limits the speed of the connection to under 10 Mbps even if the cable modem can receive at 30 Mbps. Most Local Area Networks use 10baseT Ethernet, and although they are 10 Mbps networks, it takes a LOT longer than one second to transmit 10 megabits (or 1.25 megabytes) of data from one terminal to another.

Cable modems on the same node share bandwidth, which means that congestion is created when too many people are on simultaneously. One user downloading large graphic or video files can use a significant portion of shared bandwidth, slowing down access for other users in the same neighborhood.

Most independent Internet Service Providers today connect to the Internet using a single 1.5 Mbps "T1" telephone line. All of their subscribers share that 1.5 Mbps pipeline. Cable head-ends connecting to the Internet backbone using a T1 limit their subscribers to an absolute maximum of 1.5 Mbps. 

To create the appearance of faster network access, service companies plan to store or "cache" frequently requested web sites and Usenet newsgroups on a server at their head-end. Storing data locally will remove some of the bottleneck at the backbone connection. 

How fast can they go? In a perfect world (or lab) they can receive data at speeds up to 30 Mbps. In the real world, with cost conscious cable companies running the systems, the speed will probably fall to about 1.5 Mbps.

11. My ZyAIR G-4100 can not get an IP address from the ISP to connect to the Internet, what can I do?

Currently, there are various ways that ISPs control their users. That is, the WAN IP is provided only when the user is checked as an authorized user. The ISPs currently use three ways:

  1. Check if the 'MAC address' is valid

  2. Check if the 'Host Name' is valid, e.g., @home

  3. Check if the 'User ID' is valid.

If you are not able to get the Internet IP from the ISP, check which authentication method your ISP.

12. How do I make VPN client x work through my ZyAIR G-4100 ?

The only VPN known for certain to work through the ZyAIR G-4100 is Microsoft PPTP, IPSec.

13. What is DDNS?

The Dynamic DNS service allows you to alias a dynamic IP address to a static hostname, allowing your computer to be more easily accessed from various locations on the Internet. To use the service, you must first apply an account from several free Web servers such as WWW.DYNDNS.ORG.

Without DDNS, we always tell the users to use the WAN IP of the ZyAIR G-4100 to reach our internal server. It is inconvenient for the users if this IP is dynamic. With DDNS supported by the ZyAIR G-4100, you apply a DNS name (e.g., www.zyxel.com.tw) for your server (e.g., Web server) from a DDNS server. The outside users can always access the web server using the www.zyxel.com.tw regardless of the WAN IP of the ZyAIR G-4100.

When the ISP assigns the ZyAIR G-4100 a new IP, the ZyAIR G-4100 updates this IP to DDNS server so that the server can update its IP-to-DNS entry. Once the IP-to-DNS table in the DDNS server is updated, the DNS name for your web server (i.e., www.zyxel.com.tw) is still usable.

14. When do I need DDNS service?

When you want your internal server to be accessed by using DNS name rather than using the dynamic IP address we can use the DDNS service. The DDNS server allows to alias a dynamic IP address to a static hostname. Whenever the ISP assigns you a new IP, the ZyAIR G-4100 sends this IP to the DDNS server for its updates.

15. What DDNS servers does the ZyAIR G-4100 support?

The DDNS servers the ZyAIR G-4100 supports currently is www.dydns.com and www.changeip.com where you apply the DNS from and update the WAN IP to.

16. Can the ZyAIR G-4100's SUA handle IPsec packets sent by the IPsec gateway?

Yes, the ZyAIR G-4100's SUA can handle IPsec ESP Tunneling mode. We know when packets go through SUA, SUA will change the source IP address and source port for the host. To pass IPsec packets, SUA must understand the ESP packet with protocol number 50, replace the source IP address of the IPsec gateway to the router's WAN IP address. However, SUA should not change the source port of the UDP packets which are used for key managements. Because the remote gateway checks this source port during connections, the port thus is not allowed to be changed. 


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