Definitions and functions of ADSL Modem settings (3)

In the preceding section, we introduced the two most common ways to configure ADSL and their respective purposes, now we will take the Web method as an example to describe the many configuration options that may be encountered when configuring the ADSL modem.
Detailed Web configuration
In the web configuration interface, the following describes the detailed content in the order of each tag. In most options, the detailed explanation and description are provided.
The system management configuration software installed in the ADSL Modem/Ethernet router allows us to configure this device for Internet connection and other network services. Of course, we can also use it to manage Internet connection settings, monitor the online status of ADSL devices, and set connection interfaces and protocols so that it can connect your computer or network to the ISP.
We can also use the built-in modem configuration software to establish multiple network services in our own network, including DHCP, for centralized management of IP address information in the network; the NAT Function allows all computers in the LAN to share the Internet with only one public IP address. The firewall function can protect our networks and computers to a certain extent.
The configuration management task tag has been placed on the top of the page in different categories. You can click it to configure the corresponding options. Each tag on the horizontal menu at the top of the page indicates the task that can be executed, you can click these menu items to display their detailed configuration items. When you click a new tag, most left-side task tags are displayed on the page by default. The same task may appear on more than one tag, just as the "Configure LAN" task will appear on the "Lan" and "Route" labels.

1. Home Page

The home page provides a brief excerpt from the current system configuration. Note that some configuration items can be linked to other software pages on which you can configure their settings. On this page, you can view the system information, modify system parameters, change system mode, and install quickly.

View System Information

On the homepage, we can see from Figure 7 above that the current system information is mainly composed of five parts. Let's give a brief introduction to each part.

(1) the device displays the basic information and software version of the hardware of the device, the normal running time of the system (starting from the last time the ADSL Modem was restarted), and its running mode. When we upgrade the modem firmware later, we need to know the "software version" of the modem, which helps us to differentiate two different versions of firmware programs.

(2) DSL displays the DSL online running status and online running statistics. You can click "DSL" in the header to display other DSL settings. If a red icon is displayed in "running status", the system is not running properly and is not connected to the ISP. The connection between the modem and the local server is normal only when the green icon is displayed. There is a very useful piece of information here, that is, the speed of the ADSL line. The average user may wonder how fast the bandwidth line I have applied for is. It can be seen from here. In the uplink column, it indicates the user's uplink speed (that is, uploading data to the Internet ), the downlink column is of course the user's downstream speed (the data is downloaded from the Internet to the user's computer ). As shown in figure 8, the author uses a 2 Mbps ADSL line with a behavior of 512 Kbps and 2048 Kbps. This data varies across regions.

Figure 8: the uplink/downlink speed of the line is displayed.

(3) The WAN interface displays the ADSL interface software name and various settings when the device connects to your ISP through DSL, such as PPP, EOA, or IPOA interface. Although you only have one physical DSL port, however, you can configure multiple software interfaces. You can click the interface name to view the configuration pages of these interfaces, or display more advanced taskbar for these similar options. A lower-level interface name, such as a aal-5, is displayed for each interface. You can click this lower-level interface name to view or modify the atm vc settings it uses.

(4) LAN interface display is used to connect your network for direct communication ADSL interface software name and various settings, these settings contain at least one interface called "eth-0, it may also contain an interface name named "usb-0. You can click its interface name to display the LAN configuration page.

(5) The Configuration Overview displays the following services of ADSL to help you manage your network. Translate Your private IP address to a public IP address (NAT. Allow or deny the setting of filtering rules (IP filtering) for the input or output of data ). Enable point-to-point communication (RIP ). Enable the IP address dynamically allocated by the ISP to your computer (DHCP relay); build the DHCP service in your network or install the lanport (DHCP mode) with a computer in your network ). Information acceleration is established on the Internet Organization Management Protocol (IGMP) (IGMP cannot be configured ). We can click the title of each item in the table to display the description on their configuration page.

Change System Parameters

At the bottom of the home page, in addition to the "help" and "refresh" buttons, there is also a "modify" button. The current date, time, and time zone information is stored in the ADSL Modem. If we find that the displayed time does not match the time parameter of your current region, you can click the "modify" button to modify the time information. However, modifying the date and time on the ADSL Modem does not affect the date and time on your computer.

In the new window, open the "System-modify" Page and select a new time and date from the following order. Then, select the abbreviation of the letter in your time zone from the drop-down box; in the "name" and "Domain Name" input boxes below, specify the Host Name (that is, the name of the ADSL Modem device) and the domain name (that is, the Network Name of the ADSL Modem installed on that network ). As shown in figure 9.

Figure 9: modifying system time parameters

After the modification is complete, click "Submit" to save the changed parameters to modem, then, select "save" in "Submit & restart" under "manage", and then restart the modem. In future settings, after each time we change the relevant modem parameters, you must save the modified information and restart the device to make the new setting valid. This will not be easily written in the future. Everyone should pay attention to this operation.

Of course, if the system leaves the factory by default, the general time and date in a timely manner information is not suitable for the Chinese region, we do not make any modification can also be used normally, there is no impact. However, this may not seem so comfortable for those who keep improving. My modem is displayed as 10 after modification.

Figure 10: time settings of my modem

Change System Mode

In the upper part of the home page, there is a "System Mode" option for users to choose from. In fact, in this option, it is about the selection of the Modem and local terminal connection Mode, as mentioned above, in our normal use, ADSL Modem generally has two different working states: as a transparent bridge or as a SOHO router in routing mode. This system mode allows users to select the working status of the modem. If they want to make it work in transparent bridge mode, select "Enabled" for "Bridging" and "WAN to WAN Bridging", and select "Disabled" if it is working in routing mode ", the other two values are "BRAS (Broadband Remote Access Server, Broadband Remote Access Server)" and "ZIPB (Zero Installation PPP Bridge/no PPP Bridge Installation, this technology ensures that the home user obtains a public IP address through the modem, without configuring NAT on the modem or installing the PPP client on the home computer or connecting to the Internet) you can use the default value.

Figure 10: System Mode settings

Quick installation

The "quick installation" option on the home page is similar to the Quick Setting option used in the configuration software. It basically sets the modem so that it can be connected to the ISP normally, ensure that you can connect to the Internet. The quick settings page is shown in Figure 11.

Each option setting in the Quick Setting below provides a brief description. A more comprehensive explanation and description of these setting values are described in more detail in other related content. Some Basic Telecom parameters need to be filled in with the setting values. Ask the local telecom carrier's Technical Support Hotline.

Figure 11: Quick Setting

(1) interface: select an ATM interface you want to use (usually atm-0), if you use a variety of services provided by your ISP, then we can configure the system into more than one ATM interface. For details, see the section "Configure atm vc" described later.

(2) run mode: this can be set to "enabled" or "disabled" to enable or disable the Internet and routing functions of the ADSL Modem. If it is set to "disabled ", then, the ADSL Modem cannot provide an Internet connection for your network. That is to say, this must be set to "enabled" unless you just want to use this modem as an intranet device for DHCP servers and other functions on the LAN.

(3) Encapsulation Format: This setting enables you to determine the data link type to connect to your ISP. For details, see "Configure atm vc.

(4) VPI and VCI: This setting makes sure that you will use that data link to connect your ISP. Similarly, for more information, see "Configure atm vc.

(5) Bridging: this can be set to enabled or disabled, allowing or disabling the establishment of a bridging connection between this device and your ISP, generally, the ISP may use either "RFC1483" or "Ethernet over ATM". For details, see the section "Configure bridging" below.

(6) IGMP: this can also be set to enabled or disabled. We generally choose the default value Disabled. IGMP (Internet Organization Management Protocol), which is used by some ISPs to remotely configure your devices.

(7) IP address and subnet mask: As mentioned above, if your ISP has allocated a valid public IP address to your LAN, enter the IP address and the corresponding subnet mask here (note: in some applications, the public IP address may be allocated to your computer, instead of assigning it to the ADSL Modem for use, contact the telecom carrier)

(8) default route: when a computer in the LAN is enabled, the IP address specified here will be used as the default route for the computer in the LAN, which computer in the LAN needs to access the Internet, and the data it sends is transmitted through the WAN interface.

(9) gateway IP Address: specify this IP address, that is, we need to connect to the Internet through this address. Generally, you do not need to set this because after the modem is normally connected to the local terminal, it can automatically obtain the corresponding gateway address.

(10) user name and password: If the PPPoE method is used and the modem needs to automatically dial the Internet, enter the user name and password connected to the ISP here (note: it is not the user name and password you enter the Configuration Management page ).

(11) Enable DNS: Click Enable to Enable the DNS forwarding service. This option is only used when the device is configured as a DHCP server. If Disable is selected, you must manually enter the Master/Slave DNS server address used by each computer in the following dialog box. For more details, see "Configure DNS.

(12) backup DNS server: Enter the master/backup DNS server address provided by your ISP.

After selecting or entering all the parameters, click "Submit" to complete this step. Of course, if we click the "Delete" button, it will restore the content of the entire page to the system's factory default value.

TIPS: ZIPB

We have briefly introduced the ZIPB mode when we introduced the working mode. I rarely see articles about the use of this mode by ADSL modem, which may be the reason why you do not know its application scope. In fact, it has its own unique value. First, from its name, it is translated to avoid the installation of PPP bridges. Let's analyze this name. We have already introduced the two most common ways for ADSL modem to work. One is the bridge mode, where the host is used for dialing and ADSL works as a transparent bridge, in this way, to access the Internet, you need to install the dial-up software, and the public IP address directly belongs to the Internet. One is the routing mode. In this mode, there are two situations. One is to directly bind the IP address to the ADSL modem when the ISP gives a static public IP address, the other is to obtain a dynamic public IP address through the ADSL modem. In either case, the Intranet host needs an intranet IP address to access the Internet and sets the ADSL modem as a gateway, there is no need to install the dial-up software on the master network. The advantage is that it can provide multi-host concurrent Internet access. The disadvantage is that some application software may have problems in NAT usage, some additional settings are required to make the software work normally. Now let's look at ZIPB. It works in a different way. On the one hand, it is called by the ADSL modem, so that the online machine does not need to install the code pulling software. At the same time, it is in the bridge mode. In this way, the obtained public IP address belongs to the internet server rather than the ADSL modem. Therefore, the Internet server does not need to work under the NAT server, as if it is directly connected to the Internet through a bridge. It can be seen that this is a very convenient way to access the Internet, on the one hand, there is no need for a client to pull the number, for some systems without built-in code, such as win98 saves a lot of trouble, on the other hand, as public IP addresses can be directly obtained, some network applications restricted by NAT are no longer in use.

So far, we have introduced all the options on the home page. Next we will continue to introduce the settings for LAN Settings.(