3COM 3CR858-91 User Manual

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LAN Settings 41

To configure the LAN Settings:

1Select LAN Settings from the main menu to display the LAN Settings screen (Figure 24).

Figure 24 LAN Settings screen

2Specify the Router IP Address andSubnet Mask in the appropriate fields. The default IP address of the Router is 192.168.1.1.

3If you want to use the Router as a DHCP Server, select the On radio button.

4If you need to, you can change the range of addresses allocated by the Router, by changing the IP Pool Start Address andIP Pool End Address text boxes.

5Specify the DHCP Lease time by selecting the required value from the Lease Time drop down list. The lease time is the length of time the DHCP server will reserve the IP address for each computer

6If required, specify the Local Domain Name for your network.

7If you use 3Com NBX telephones, enter the IP address of the NBX call processor at 3Com NBX Call Processor.

8Either click Apply to save these settings, or go to DHCP Clients List if you want to manage the DHCP clients.

42 CHAPTER5: ROUTERCONFIGURATION

DHCP Clients List

The DHCP Clients List provides details on the devices that have received IP addresses from the Router. The list is only created when the Router is set up as a DHCP server. For each device that is connected to the LAN the following information is displayed:

IP address — The Internet Protocol (IP) address issued to the client machine.

Host Name — The client machine’s host name, if configured.

MAC Address — The Media Access Control (MAC) address of the client’s network card.

From this screen, you can do the following:

In the table, check the Fix text box to permanently fix the IP address.

In the table, click release to release the displayed IP address.

Click New to allocate an IP address to a MAC address.

As you connect more devices, the client list will grow to a maximum number of 253 clients.

Internet Settings Before you can configure the Router, you need to know the IP information allocation method used by your ISP. There are five different ways that ISPs can allocate IP information, as described below:

Dynamic IP Address (DSL or Cable)

Dynamic IP addressing (or DHCP) automatically assigns the Router IP information. This method is popular with Cable providers. This method is also used if your modem has a built in DHCP server.

PPPoE (DSL only)

If the installation instructions that accompany your modem ask you to install a PPPoE client on your PC, then select this option. To configure the Router you will need to know the following:

Username

Password

Service Name (if required by your ISP)

MTU (if supplied by your ISP)

Internet Settings 43

When you install the Router, you will not need to use the PPPoE software on your PC.

PPTP (DSL or Cable)

PPTP is only used by some European providers. If the installation instructions that accompany your modem ask you to setup a dialup connection using a PPTP VPN tunnel then select this option. To configure the Router you will need to know the following:

Username

Password

VPN Server address (usually your modem)

When you install the Router, you will not need to use the dialup VPN on your PC anymore.

L2TP (DSL or Cable)

L2TP is supported by some Internet Service Providers (ISPs). Check with your ISP to make sure L2TP is supported before selecting this option. To configure the Router you will need to know the following:

Username

Password

L2TP Server address

Static IP Address (DSL or Cable)

The ISP provides the IP addressing information for you to enter manually. To configure the Router you will need to know the following:

IP Address

Subnet Mask

ISP Gateway Address

These screens enable you to edit the settings that you configured using the Setup Wizard.

Connection to ISP Before beginning this section, ensure you have the required information from your ISP.

Select Internet Settings from the main menu to display the Internet

Settings screen. Then, select an IP allocation mode from the following:

44CHAPTER5: ROUTERCONFIGURATION

Dynamic IP Address (automatically allocated) — see page 44.

PPPoE (used by DSL providers only) — see page 45

PPTP (used by some European providers) — see page 46

L2TP (supported by some ISPs) — see page 47

Static IP Address (to be specified manually) — see page 48

Dynamic IP Address

To configure the dynamic IP address connection for your Router:

1Select Dynamic IP Address and then clickNext. The Dynamic IP Screen displays (seeFigure 25).

Figure 25 Internet Settings - Dynamic IP Screen

2Some ISPs require a host name. If your ISP has this requirement, enter the host name in the Host Name text box .

3Either:

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.

4Check all of your settings and then click Apply.

Internet Settings 45

PPPoE

To configure the PPPoE connection for your Router:

1Select PPPoE and then clickNext. The PPPoE Interface screen displays (seeFigure 26).

Figure 26 Internet Settings - PPPoE Interface Screen

2Enter your PPP over Ethernet user name in the User Name text box.

3Enter your PPP over Ethernet password in the Password text box and enter it again in theRetype Password text box.

4If required, enter your PPP over Ethernet service name in the Service Name text box. This is optional. Not all ISPs require a PPPoE service name.

Do not enter anything in this box if your ISP does not require a service name.

5Enter the MTU value supplied by your ISP in the MTU text box. If your ISP has not supplied an MTU value, leave this at the default value. The default is 1454.

6Type in an Idle Timeout. This is the amount of time you want the PPPoE Server to remain inactive before the session is ended.

7If you want to automatically reconnect to the server after timeout, check the Auto Reconnect After Timeout check box.

8Check all of your settings, and then click Apply.

46 CHAPTER5: ROUTERCONFIGURATION

PPTP

To configure the PPTP connection for your Router:

1Select PPTP and then clickNext. The PPTP screen displays (seeFigure 27).

Figure 27 Internet Settings - PPTP Screen

2Enter your PPTP server address in the PPTP Server Address text box.

3Enter your PPTP user name in the User ID text box.

4Enter your PPTP password in the Password text box, and enter it again in theRetype Password text box.

5Type in an Idle Timeout. This is the amount of time you want the PPTP Server to remain inactive before the session is ended.

6Either:

Check the Get IP by DHCP check box if you want to obtain the IP information from a DHCP Server on the network.

With this check box enabled, you can click Release to release the WAN IP Address for the Router, or clickRenew to renew the current WAN IP Address, using DHCP.

Or:

If your ISP has provided you with IP address information, enter the IP Address, Subnet Mask andDefault Gateway in the text boxes provided, or

7 Check all of your settings, and then clickApply.

Internet Settings 47

L2TP

Check with your ISP to make sure they support L2TP.

To configure the L2TP connection for your Router:

1Select L2TP and then clickNext. The L2TP screen displays (seeFigure 28).

Figure 28 Internet Settings - L2TP Screen

2Enter your L2TP server address in the L2TP Server text box.

3Enter your L2TP user name in the User ID text box.

4Enter your L2TP password in the Password text box, and enter it again in theRetype Password text box.

5Type in an Idle Timeout. This is the amount of time you want the L2TP Server to remain inactive before the session is ended.

6Either:

Check the Get IP by DHCP check box if you want to obtain the IP information from a DHCP Server on the network.

With this check box enabled, you can click Release to release the WAN IP Address for the Router, or clickRenew to renew the current WAN IP Address, using DHCP.

If your ISP has provided you with IP address information, enter the IP Address, Subnet Mask andDefault Gateway in the text boxes provided.

7Check all of your settings, and then click Apply.

48 CHAPTER5: ROUTERCONFIGURATION

Static IP Address

To configure a Static IP Address for your Router:

1Select Static IP Address and then clickNext. The Static IP Address screen displays (seeFigure 29).

Figure 29 Internet Settings - Static IP Screen

2Enter the IP Address provided by your ISP in the IP Address assigned by your Service Provider text box.

3Enter the Subnet Mask provided by your ISP in the Subnet Mask text box.

4Enter the Gateway Address provided by your ISP in the Service Provider Gateway Address text box.

Check all of your settings, and then click Apply.

Internet Settings 49

DNS To configure the Domain Name Server (DNS) information for your Router, do the following:

1Select Internet Settings, then from thesub-menuselectDNS. The DNS screen displays (seeFigure 30).

Figure 30 Internet Settings - DNS Screen

1Either:

Check the Automatic from ISP check box. Or,

If your ISP has provided you with a specific DNS address to use, or you chose Static IP Address in the Internet Settings screen, type theDNS Address in the text box.

Optionally, you can type a Secondary DNS Address in the appropriate text box. Leave this box blank if your ISP has not supplied a secondary address.

2Click Apply to save your settings.

50 CHAPTER5: ROUTERCONFIGURATION

Hostname & MAC To configure the Hostname and MAC Address information for your Router, do the following:

1Select Internet Settings, then from thesub-menuselectHostname & MAC. The Hostname and MAC Address screen displays (seeFigure 31).

Figure 31 Internet Settings - Hostname and MAC Address Screen

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

2Either:

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

WAN MAC address. Or,

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

To reset the MAC Address to the default, select Reset MAC.

3Click Apply to save the settings.

Firewall

Use the Firewall menu option to enable and disable the firewall, and to

 

configure the following firewall functions

 

SPI (Stateful Packet Inspection) — SPI inspects packets at the

application layer, maintains TCP and UDP session information, and detects and prevents certain types of network attacks such as DoS attacks. See “SPI” onpage 51.