3COM 3CR858-91 User Manual

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Select either Network orHost as the local type setting.

Enter the Remote Server IP address in the text box.

8If you want to enter details of the remote network, check the Remote Network Setting - Enable check box, then enter theRemote Network Address andRemote Subnet Mask.

9Click Apply to save the settings.


SNMP (Simple Network Management Protocol) allows remote


management of your Router by a PC that has an SNMP management


agent installed.

You can configure the following SNMP parameters:

Community — This configures the SNMP community string, which authenticates remote users.

Trap — You can also configure the Router to send status messages to the SNMP management agent if a problem occurs on the network. This is done by using Traps.

To set up SNMP Community and Trap parameters, do the following:

1Select SNMP from the main menu. TheSNMP screen displays (Figure 48).

Figure 48 SNMP Screen

2 SelectEnable to activate SNMP.


3In the Community column, enter the name of the SNMP communication channel. Your SNMP management agent needs to be configured with this name so that it can communicate with your Router.

4In the Access column, select either:

Read to allow the management agent to collect data (for example, bandwidth usage) from your Router. Or,

Write to allow the management agent to change the configuration of your Router.

5Check the Valid check box to enable the community.

6If you do not want to configure your Router to send status messages to the SNMP management agent if a problem occurs, click Apply to save the settings.

If you want to configure your Router to send status messages, or Traps, configure SNMP Traps in the lower section of the screen as follows:

7In the IP Address field, enter the IP address of the PC to which you want your Router to send status messages.

8In the Community field, enter the community that you want to use to access status messages.

9Select the version of trap messaging that your management agent supports from the Version drop-downlist. The Router supportsV1 andV2c trap messaging.

10Click Apply to save the settings.

System Tools

These screens enable you to manage different parameters of the Router


and perform administrative functions. The Systems Tools menu has the


following sub-menus:


Restart Router — enables you to restart the Router and retain the


current system configuration.


Reset to Factory Defaults — resets the Router to factory default


settings, and loses the current configuration.


Backup/Restore Settings — enables you to save a configuration file,


and restore any saved configuration file.


Upgrade — enables you to upgrade the Router’s firmware.


Admin Password — enables you to reset the system password.


Time Zone — enables you to change time zone settings.

System Tools 73

Refer to the following sections for details on each of these options.

Restart Router Sometimes it may be necessary to restart or reboot the Router. Restarting or rebooting the Router will not delete any of your configuration settings.

To restart the Router:

1Select System Tools from the main menu, then selectRestart from thesub-menu.The Restart Router screen displays (Figure 49).

Figure 49 Restart Router Screen

2 ClickRestart to restart Router.

Reset to Factory Use this option to reset all of the configuration settings in the Router toDefaults the factory (default) settings.

CAUTION: 3Com recommends that you backup your configuration settings before you reset to factory defaults, otherwise configuration information may be lost. Refer to“Backup/Restore Settings” onpage 74 for details.


To restore the factory default settings:

1Select System Tools from the main menu, then selectReset to Factory Defaults from thesub-menu.The Reset to Factory Defaults screen displays (Figure 50).

Figure 50 Reset to Factory Defaults Screen

2 ClickReset.

Backup/Restore You can save your current configuration using this feature. Saving yourSettings configuration will allow you to restore it later if your settings are lost or


3Com recommends that you backup your current configuration before performing a firmware update or a reset to factory defaults.

This option also enables you to restore a previously saved configuration.

System Tools 75

Saving a configuration file

To save a configuration file:

1Select System Tools from the main menu, then selectBackup/Restore Settings from thesub-menu.TheBackup/Restore Settings screen displays (Figure 51).

Figure 51 Backup/Restore Settings Screen

2Click Save to save your current configuration settings.

Restoring a configuration file

To restore a previously saved configuration file:

1Select System Tools from the main menu, then selectBackup/Restore Settings from thesub-menu.TheBackup/Restore Settings screen displays (Figure 51).

2Click Browse to display the list of currently saved configuration files. The file you select displays in the text box.

3Click Restore to restore this configuration file.

Upgrade From time to time 3Com may release new versions of the Router’s firmware. Firmware updates contain improvements and fixes to problems that may exist with the current version.

Please download the firmware file to your PC first, and then use the Upgrade screen to upload the firmware to the Router.


To upload a firmware file from your PC to your Router:

1Select System Tools from the main menu, then selectUpgrade from thesub-menu.TheUpgrade screen displays (Figure 52).

Figure 52 Upgrade Screen

2Click Browse to display the list of currently saved firmware upgrade files. The file you select displays in the text box.

3Click Upgrade to upload this firmware file to your Router.

Admin Password The Router ships with a default password ofadmin. 3Com recommends that you change the password for added security. Keep your password in a safe place as you will need this password to log in to the Router in the future. 3Com also recommends that you set a password if you plan to use the Remote management feature of this Router.

System Tools 77

To change the password:

1Select System Tools from the main menu, then selectAdmin Password from thesub-menu.TheAdmin Password screen displays (Figure 53).

Figure 53 Admin Password Screen

2Enter the current password into the Current password text box.

3Enter the new password into the New Password andConfirm New Password fields.

4Type in a Login Timeout. This is the amount of time you want the Router to remain inactive before it returns to the login screen. The default is 10 minutes.

5Click Apply.

Time Zone 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 synchronized clock in the Router is used to record the security log and control client filtering.

You can specify which SNTP servers the Router will use to update it’s system clock, although doing this should only be necessary if you are experiencing difficulty.


To configure time zone settings:

1Select System Tools from the main menu, then selectTime Zone from thesub-menu.TheTime Zone screen displays (Figure 54).

Figure 54 Time Zone Screen

2Select the Base Date andBase Time. The Router will use these settings if it is unable to connect to the Internet or SNTP Server.

3To enable SNTP, check the Using Time Server (NTP) check box.

4Select a time zone from the Set Time Zone drop down list.

5Enter 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.

6Select a primary SNTP server, and if required a secondary SNTP server from the appropriate drop down boxes.

7If you want to enable daylight saving, check the Daylight Savings check box.

8Select 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 down lists. It does not cause the system clock to be updated for daylight savings time automatically.

9Click Apply to save the settings.

Advanced 79


From the Advanced Screen, you can configure:


NAT (Network Address Translation) and IPSecNAT-T(NAT Traversal)





Universal Plug and Play


WAN Ping Blocking


Remote Administration


The sub-menutopics in the Advanced menu also enable you to configure


Routing options, and to configure Dynamic DNS.


NAT — Before you disable this function, make sure you have changed



the administrator password. Network Address Translation (NAT) is the

method by which the router shares the single IP address assigned by your ISP with the computers on your network.

This function should only be disabled if your ISP assigns you multiple IP addresses or you need NAT disabled for an advanced system configuration. If you have a single IP address and you turn NAT off, the computers on your network will not be able to access the Internet. Other problems may also occur.

IPSec NAT-T Pass-through NAT-T(NAT Traversal) is an Internet Draft proposed to IETF in order to help the problems associated with passing IPSec traffic through NAT Routers. ForNAT-Tto work, both ends of the connection need to support this function.

Ensure that you enable NAT-T only if it is needed, as it will reduce

LAN-WANthroughput. The OfficeConnect Cable/DSL Router supports

NAT-Tdraft 2 implementation.


To configure NAT, and IPSec NAT-TPass-through:

1Select Advanced from the main menu. TheAdvanced screen displays (Figure 55).

Figure 55 Advanced

2 To disable NAT, select theOFF radio button.

3Com recommends that you leave NAT enabled for maximum security.

3To enable IPSec NAT-TPass-through,select theOn radio button.

4If required, continue configuring advanced options on this screen, or click Apply to save the settings.

Universal Plug and Universal Plug and Play is a technology that offers seamless operation ofPlay voice messaging, video messaging, games, and other applications that

are Universal Plug and Play compliant. Some applications require the Router's firewall to be configured in a specific way to operate properly. This usually requires opening TCP and UDP ports and in some instances setting trigger ports. An application that is Universal Plug and Play compliant has the ability to communicate with the Router, basically "telling" the Router which way it needs the firewall configured. The Router ships with the Universal Plug and Play feature disabled. If you