3Com OfficeConnect 3CP4144 Manuals

OfficeConnect® Remote 812 ADSL Router Technical Support Information contained in this document is correct at time of publication. These services are available 24 hours a day, 7 days a week. For the most up–to–date information, 3Com recommends that you access the 3Com Corporation World Wide Web site. World Wide Web Site http://www.3com.com This service provides access to online support information such as technical documentation and soft- ware library, as well as support options ranging from technical education to maintenance and profes- sional services. Support from Your Network Supplier If additional assistance is required, contact your network supplier. Many suppliers are authorized 3Com service partners who are qualified to provide a variety of services, including network planning, installa- tion, hardware maintenance, application training, and support services. When you contact your network supplier for assistance, have the following information ready: • Product model name, part number, and serial number • A list of system hardware and software, including revision levels • Diagnostic error messages • Details about recent configuration changes, if applicable If you are unable to contact your network supplier, see the following section on how to contact 3Com. Support from 3Com If you are unable to obtain assistance from the 3Com online technical resources or from your network supplier, 3Com offers technical telephone support services. To find out more about your support options, please call the 3Com technical telephone support phone number at the location nearest you. Please refer to the list below. When you contact 3Com for assistance, have the following information ready: • Product model name, part number, and serial number • A list of system hardware and software, including revision levels • Diagnostic error messages • Details about recent configuration changes, if applicable Returning Products for Repair Before you send a product directly to 3Com for repair, you must first obtain a Return Materials Authorization (RMA) number. Products sent to 3Com without RMA numbers will be returned to the sender unopened, at the sender’s expense. To obtain an RMA number, please call the local number for your region, listed below. 10044810 Rev. AA March 2001

OfficeConnectTM Remote 812 ADSL Router v 1.1.7 Release October 2000 New Features: * Added PPPoE Client on a Remote Site VC profile (WAN inter- face). * Added DHCP Client on a Remote Site VC profile. * Added IP Management address on a VC Remote Site profile. * Implemented an Access List to restrict access to the 812's Man- agement Services (HTML, telnet, tftp, snmp). * Increased number of filters conditions from 40 to 120. * Modified the NAT component to translate protocols other than TCP, UDP, ICMP, and GRE. * Added a Watchdog timer. * Added canned filters to block file and printer sharing ports (TCP 139 & 143 and UDP 137 & 138). * Added DIP switch setting to enable default ADSL Open Mode. Set DIP Switch #1 “on” for ANSI or “off” for MultiMode. Bugs Fixed: * Corrected mask and offset of the generic filter to allow specific bits. One can now define a filter rule to reject incoming TCP connections. * Corrected error in the console password logic which resulted in the unit to "hang". The CLI command to enable this feature was modified to ensure the user entered in a known password. See "CLI notes" below. continued on next page

How to setup HTTP Filtering to prevent Denial-of-Service Attacks on the OfficeConnect Remote 812 Router By default, the OCR 812 Web Configuration interface is accessed from the LAN interface as well as the WAN interface. The following procedure describes how to configure a filter that prohibits access to the built-in HTTP server and the Web Configuration interface from the WAN interface. This filter will prevent all access to TCP and UDP port 80 from the WAN interface to the OCR 812. The Web Configurator, however, will still be available to users on the local LAN interface for managing the unit. Step 1: Using a workstation on the local area network. Launch your web browser. On the Address bar, enter the IP address of the Router. You will be prompted for the user- name and password for the unit. (Figure 1) After logging into the unit, the OfficeConnect Remote 812 Manager screen is dis- played.(Figure 2) Figure 1 Figure 2

http://www.3com.com/ OfficeConnectTM Remote 812 ADSL Router Getting Started Guide Version 1.0 Part No. 1.024.2427-00 Published February 2000

http://www.3com.com/ OfficeConnectTM Remote 812 ADSL Router CLI User’s Guide Release 1.1