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3Com 3C840 manual 2CHAPTER 7 Configuring Dhcp

Models: 3C840

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7-2CHAPTER 7: CONFIGURING DHCP

The OfficeConnect Remote 840 can be configured to support up to 40 workstations on the local LAN. In addition, the OfficeConnect Remote 840 can be configured to be a DHCP Relay.

When enabled, the Relay will process the broadcast request from the local workstation and send it to one or two remote DHCP servers. The response from the remote DHCP servers is processed and forwarded to the local workstation.

Configuring the The OfficeConnect Remote 840 has three DHCP modes; Server, Relay,

DHCP Mode and Disable. To configure the mode, select Configuration > Global > DHCP from the home page. The following screen will be shown:

To configure the OfficeConnect Remote 840 as a Server, select Server > Submit > Configure DHCP Server to proceed with Server specific settings (see “Configuring the DHCP Server”).

To configure the OfficeConnect Remote 840 as a Relay, select Relay > Submit > Configure DHCP Relay to proceed with Relay specific settings (see “Configuring the DHCP Relay”).

Select the Disable button and press the submit button to disable the

OfficeConnect Remote 840's DHCP functionality.

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3Com 3C840 manual 2CHAPTER 7 Configuring Dhcp

Contents

OfficeConnect Remote Sdsl Router User’s Guide 3Com Corporation 5400 Bayfront Plaza Santa Clara, California About this Guide System Administration Configuring IP Routing Configuring Bridging Configuring Dhcp Upgrading Operational Software for the Officeconnect Remote Configuring Filters Troubleshooting Bridging and Routing Using the CLI Guide Technical Support Page About this Guide Introduction Guide Conventions Text Convention About this Guide 3Com Year 2000 web YearCompliance About this Guide Overview Introduction Remote 840? What IsOfficeConnect What is an Sdsl What is ATM?What is Frame Modem? 4CHAPTER 1 Overview What is a Remote Site? 3Connection with Three Virtual Circuits VCs What is RFC 1490? Smart Mode? What is DhcpNAT and PAT can be configured for each remote site What Is Default Bridge Mode?Getting Started Quickly OfficeConnect Remote FeaturesRemote 840 Panel 5OfficeConnect Remote 840 Back Panel DIP Switch Modes Configuration Local Site LAN, Remote Site WAN, and Global configuration.Following shows the areas of configuration for each Overview Test the network accessibility Check the routing tables on configured protocolsRemote Ping a remote site Manager Menus StartingManager Using OfficeConnect Remote Manager Header Quick Link Area Main Area Where to Find More Configuration Information 18CHAPTER 1 Overview System Administration Performing System Administration Tasks Select the login name to be deleted Click Delete Adding a LoginDeleting a Login Restoring Factory DefaultsAdministrator System screen Using Manager to RestoreAccess Updating Controlling Snmp Access 6CHAPTER 2 System Administration Assigning Snmp Trap ManagersSend an unsolicited message to a Snmp manager Instructions 8CHAPTER 2 System Administration Remote Site Management Remote SiteDivided into the following parts Connection and communication to the remote site Adding a Remote Site Profile Managing aRemote Site Profile Modifying a Remote Site Profile Deleting a Remote Site Profile Configuring Network Service Information PPP / RFC 1483 / RFC This will access the Remote Sites General Modify Screen Select Network Service to either PPP over Frame Relay or RFC Frame Relay Configuring ATM Check the Enable Remote Site boxInformation ATM Modify Screen Configuring ATM Information Configuring Protocol ParametersMonitoring Remote Site Connections Configuring IP Routing Overview Access the IP Screen through Configuration Global IP IP Select Configuration Local Site LAN IP Network Configuring IP RIP On the LANNecessary Advanced RIP Resetting Parameters Configuring IP for Configuring IPConnection Parameters for Local WAN IP Address Network InformationComplete the following entries Remote WAN IP Address On a Remote Site Sites IP Configuring IP Site Select Configuration Remote Sites WANStatic and Framed Routes IP Route Using IP Address Validation Monitoring Ping timeout waiting for reply from IP Address Ping Responses IPAddress is alivePing no route to host Ping host unreachable An example script of a successful ping is IP Testing Ping 18CHAPTER 4 Configuring IP Routing Configuring Bridging To set up bridging on the OfficeConnect Remote 840, you must For more information on bridging, see Appendix A, Bridging Select Configuration Local Site LAN Bridge Bridging forMonitor Networks Network Status table Adding a Bridge Profile, and then you modify the profile to enable bridging ConnectionsTo that remote site Monitor Network Network Status table Bridging IP Traffic 6CHAPTER 5 Configuring Bridging Check the Enable MAC Encapsulated Routing box to enable MAC OfficeConnect Remote 840 can be configured for simultaneousBridge Firewall Encapsulated Routing for this remote site Forward Broadcast/Unicast Packets All Discard Routed Protocols DiscardForward Unicast Packets Only Unicast Advanced Bridging Options Default Bridge Mode Testing Bridging Monitoring BridgingViewing Bridge From the addresses 12CHAPTER 5 Configuring Bridging Network Address Translation Using the Officeconnect Remote Selecting Address TranslationPage Configuring Static Data Protocol UDP button to access the static port tablesPAT Port Entries Press the Modify button to set the addressPage Each entry will have the same public address Port number, and the value of the inactivity timerNetworks NAT/PAT Port Assignments screen. Only those Page Configuring Dhcp Dhcp OverviewResponds with An IP address for the workstation 2CHAPTER 7 Configuring Dhcp Dhcp Server Dhcp Smart Mode Access the Monitor Networks Dhcp Dhcp leases screenDhcp Relay Monitoring Dhcp Dhcp 6CHAPTER 7 Configuring Dhcp Configuring DNS DNS Overview Two servers may be specified per domain name Remote DNSServers Click Add DNS Host Entries Configuring IPX Routing IPX packet based on the destination IPX network number Adding a Local IPX To add a Local IPX network Information, such as IPX addresses and IPX routing Configuring IPX forRemote Sites Configure Remote Site IPX Network Information Configuring IPX Check the Enable IPX checkboxBoth Established Select the remote site to modify, and click Modify Click Framed Routes Services Services include file servers and printersReal-time via SAP packet exchange between routers Associated remote site is active Adding a Static IPX To add a static IPX Service to a LAN Select Configuration Global IPX IPX Services Click Framed Services Select Configuration Local Site IPX RIP and SAP Modify screen IPX Testing Monitoring IPX IPX Testing 14CHAPTER 9 Configuring IPX Routing Software Obtaining UpdatedUpgrading Operational Software for Officeconnect Remote Installing OperationalSoftware to Remote 840 UnitPage Execute the batch file with the following command dl 115 ms Wait for the download to complete Monitoring Officeconnect Remote IPX 11-2CHAPTER 11 Monitoring the Officeconnect Remote Ethernet Interface Throughput Graphs 11-4CHAPTER 11 Monitoring the Officeconnect Remote Interface Status Information in the Monitor Sdsl Transceiver Status screen Remote Site Connection ATM Site Counters Frame Relay VC Site Counters Sites Remote Site StatusPage Dhcp Address Translation 11-12CHAPTER 11 Monitoring the Officeconnect Remote IPX Bridge Events Logs Connection to the WAN or whenever a critical event happens 11-16CHAPTER 11 Monitoring the Officeconnect Remote Configuring Filters Filtering Overview Filtering Capabilities 2Advertisement Filters Creating Filters Overview Creating FiltersTraffic Bridge filter in this example Creating Filters Using the OfficeConnect Remote 840 Manager 12-6CHAPTER 12 Configuring Filters Filter Screens Filter Index Filter StatusFilter Create/Modify Filter Summary Condition Screens 3Basic IP Condition 5Basic IPX Condition Delete Filter/Add Condition screen Delete Filter /Add Condition Filter Delete/Modify 12-12CHAPTER 12 Configuring Filters Go to Configuration Global Filters Filter UsingDisable the filter by unchecking the Enable Filter checkbox Direction/location 12-14CHAPTER 12 Configuring Filters Troubleshooting Bridge Connection Problems Configuration problems are covered Guide for more information LAN Connection Problems IP Wizard and Web Browser Problems Specified address, configure IP Wizard and Web Browser Problems WAN Connection Problems General Network Connection Problems Symptom Possible Cause Correction Action Error test Remote network ATM cells are being IP Network Connection Problems Save the current configuration and reboot Symptom Possible Cause My video application IPX Network Connection Problems IPX is not enabled over both the LAN and the WAN Bridge Connection Problems Bridging is not enabled over both the LAN and the WAN 13-14CHAPTER 13 Troubleshooting Bridging and Routing Routing ConceptsDecide Terrestrial and satellite links 2APPENDIX a Bridging and Routing How Bridges Learn A-3 4APPENDIX a Bridging and Routing How Bridges Learn A-5 Network OrganizationStructure, Physical Layout Network Organization, Structure, and Physical Layout A-7 8APPENDIX a Bridging and Routing RIP. RIP is also known as a distance vector protocol IP RoutingInformation the router uses to make these assessments is 10APPENDIX a Bridging and Routing Administrators that are new to the IP protocol IP AddressingIntroduction to IP Addressing Subnets of Class C networks Mask Binary Subnets Hosts/Subnet IP Addressing Basics Remote Add ip network houston address 192.75.202.99/23 6APPENDIX B IP Addressing 176 248 Table B-2IP Addresses Figure B-1Numbered WAN Interfaces IP Addressing Basics 10APPENDIX B IP Addressing Address Translation Tutorial Becoming more scarce 2APPENDIX C Address Translation Tutorial Figure C-1 NAT Example Port Address Translation PATStatic NAT PAT Example Figure C-2 PAT Example 6APPENDIX C Address Translation Tutorial Using the CLI Guide Accessing the CLIDocumentation From 2APPENDIX D Using the CLI Guide Instructions for Configuration NON -SETUPInternet Access Set Network Service to PPP over Frame Relay or RFC Instructions for Internet Access Only Instructions for Internet Access Page Planning Form from of the Installation Guide by entering Information from your remote site network administratorTelecommuting Remote Office Enter the Dlci Instructions for Telecommuting / Remote Office Access E-9 Remote Site IP Otherwise, press Next Instructions for Telecommuting / Remote Office Access E-11 Remote site configuration Then press the Save Configuration button Configuration Audit AuditLocal IPX Network These steps Follow these steps Testing Saving Online Technical Support from YourNetwork Supplier World Wide Web Site Country Telephone Number Fax Number Numbers Configuring ATM information Default Bridge Mode Critical Event Log 11 Filtering Advertisement filters Networks Monitoring the OfficeConnect Remote Defined Snmp Storms a Structure WAN Page 3Com Corporation Limited Warranty Warranties Exclusive FCC Class B Statement