3COM 3CR858-91 User Manual

4.17 Mb





The Router has the ability to dynamically allocate network addresses to


the computers on your network, using DHCP. However, your computers


need to be configured correctly for this to take place. To change the


configuration of your computers to allow this, follow the instructions in


this chapter.



Obtaining an IP

Follow the instructions for your particular operating system to ensure that


your computers are configured to obtain an IP address automatically.



Windows 2000 If you are using a Windows2000-basedcomputer, use the following procedure to change your TCP/IP settings:

1From the Windows Start Menu, selectSettings >Control Panel.

2Double click on Network andDial-UpConnections.

3Double click on Local Area Connection.

4Click on Properties.

5A screen similar to Figure 6 should be displayed. SelectInternet Protocol TCP/IP and click onProperties.


Figure 6 Local Area Properties Screen

6Ensure that the options Obtain an IP Address automatically, and Obtain DNS server address automaticallyare both selected as shown in Figure 7. Click OK.

Figure 7 Internet Protocol (TCP/IP) Properties Screen

7 Restart your computer.

Obtaining an IP Address Automatically


Windows XP If you are using a Windows XP computer, use the following procedure to change your TCP/IP settings:

1From the Windows Start menu, selectControl Panel.

2Click on Network and Internet Connections.

3Click on the Network Connectionsicon.

4Double click on LAN orHigh Speed Connection icon. A screen titledLocal Area Connection Status will appear.

5Select Internet Protocol TCP/IPand click on Properties.

6Ensure that the options Obtain an IP Address automatically, and Obtain DNS servers automaticallyare both selected. Click OK.

7Restart your computer.

Windows 95/98/ME If you are using a Windows 95/98/ME computer, use the following procedure to change your TCP/IP settings:

1From the Windows Start Menu, selectSettings > Control Panel.

2Double click on Network. Select theTCP/IP item for your network card and click onProperties.

3In the TCP/IP dialog, select the IP Address tab, and ensure thatObtain IP address automatically is selected. ClickOK.

Macintosh If you are using a Macintosh computer, use the following procedure to change your TCP/IP settings:

1From the desktop, select Apple Menu,Control Panels, andTCP/IP.

2In the TCP/IP control panel, setConnect Via: to “Ethernet”.

3In the TCP/IP control panel, set Configure: to “Using DHCP Server.”

4Close the TCP/IP dialog box, and save your changes.

5Restart your computer.


Disabling PPPoE If you have PPPoE client software installed on your computer, you willand PPTP Client need to disable it. To do this:


1From the Windows Start menu, selectSettings > Control Panel.

2Double click on Internet Options.

3Select the Connections Tab. A screen similar toFigure 8 should be displayed.

4Select the Never Dial a Connectionoption.

Figure 8 Internet Properties Screen


You may wish to remove the PPPoE client software from your computer


to free resources, as it is not required for use with the Router.



Disabling Web

Ensure that you do not have a web proxy enabled on your computer.



Go to the Control Panel and click onInternet Options. Select theConnections tab and clickLAN Settings at the bottom. Make sure that theUse Proxy Server option is unchecked.




Accessing the

The Router setup program is Web-based,which means that it is accessed


through your Web browser (Netscape Navigator or Internet Explorer).


To use the Setup Wizard:


Ensure that you have at least one computer connected to the Router.


Refer to Chapter 2 for details on how to do this.


Launch your Web browser on the computer.


Enter the following URL in the location or address field of your browser: (as shown in Figure 9).

Figure 9 Web Browser Location Field (Factory Default)


The Login screen displays (Figure 10).

Figure 10 Router Login Screen

4Log in by typing the administrator password (the default password is admin) in theSystem Password field, and clickingLog in.

Be sure to bookmark this screen for easy reference if you should want to change the Router settings.

The Wizard will attempt to launch automatically, but if it fails, select Setup Wizard from the main menu.

5You will be guided step by step through a basic setup procedure, described in the following sections. At any time, click Next to move to the next screen, clickBack to return to the previous screen, or clickCancel to exit the Wizard.

Accessing the Wizard 27

Password Figure 11 Admin Password Screen

In the Admin Password screen (Figure 11)

1Type the Current Password.

2Type a new password in both the New Password andConfirm New Password boxes.

3Type in a Login Timeout. This is the amount of time you want the Router to remain inactive before it returns to the login screen.

3Com recommends entering a new password when setting up the Router for the first time. The Router is shipped from the factory with a default password, admin.

The Password is case sensitive. Write the new password down and keep it in a safe place, so that you can change your settings in the future.

4Click Next to display theTime Zone setup screen (Figure 12).


Time Zone Figure 12 Time Zone Screen

The Router keeps time by connecting to a Simple Network Time Protocol (SNTP) server. This allows the Router to synchronize the system clock to the Internet. The synchonized clock in the Router is used to record the security log. To set the time zone for your Router, do the following:

1Select the Base Date andBase Time. The Router will use these settings if it is unable to connect to the Internet or SNTP Server.

2To enable SNTP, check the Using Time Server (NTP) check box.

3Select a time zone from the Set Time Zone drop down list.

4Enter the interval, in hours, at which to want the Router to resynchonize with the SNTP Server, at the Synchonization Interval text box. The default is every 24 hours.

5Select a primary SNTP server, and if required a secondary SNTP server from the appropriate drop down boxes.

6If you want to enable aylight saving, check the Daylight Savings check box.

7Select the month and day that you want daylight savings to begin at Start Time, and select the month and day that you want daylight davings to end atEnd Time.

The Daylight Savings option advances the system clock by one hour between the dates that you specify in the Start Time and End Time drop

Accessing the Wizard 29

down lists. It does not cause the system clock to be updated for daylight savings time automatically.

8 ClickNext to display the Connection Type screen.

Connection Type Figure 13 Connection Type Screen

This Connection Type screen allows you to set up the Router for the type of Internet connection you have. Before setting up your Internet connection mode, have the modem setting information from your ISP ready.

Select an Internet Addressing mode from the following:

Dynamic IP Address — see page 30.

PPPoE (typically DSL users only) — see page 31.

PPTP (some DSL users in Europe) — see page 32.

L2TP (supported by some ISPs) — see page 32.

Static IP Address — see page 34.

and click Next.

For further information on selecting a mode see “Internet Settings” onpage 42.


Dynamic IP Address Mode

Figure 14 Dynamic IP Screen

1Some ISPs require a host name. If your ISP has this requirement, enter the host name in the Host Name text box .


If your ISP requires an assigned MAC address, enter the values for a

MAC address. Or,

If the computer you are now using is the one that was previously connected directly to the cable modem, select Clone.

3Click Next. The DNS screen displays. Refer to“DNS” onpage 35.