Remote DNS, Servers | 3Com 3C840 specs

8-2CHAPTER 8: CONFIGURING DNS

Configuring DNS To access the DNS configuration screens, go to the OfficeConnect Remote 840 Manager and select Configuration > Global > DNS.

This screen contains the following fields:

1To enable DNS services, check the Enable DNS box.

2To specify the number of times the OfficeConnect Remote 840 will attempt to reach a primary or secondary DNS server, enter the number in the Number of Retries field.

3To specify the amount of time to wait for a timeout when the OfficeConnect Remote 840 attempts to reach a primary or secondary DNS server, enter the number of seconds in the Timeout field.

4Click Submit.

Configuring	When the OfficeConnect Remote 840's DNS Proxy cannot find a domain
Remote DNS	name in its local static entries, it will forward the request to one or two
Servers	remote servers. The remote DNS Server can be learned dynamically if the
	remote site is configured for PPP, otherwise it must be specified. Up to
	two servers may be specified per domain name.

Image 98

3Com 3C840 manual Remote DNS, Servers, Two servers may be specified per domain name

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 Frame What is an SdslWhat is ATM? 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 Getting Started What Is DefaultBridge Mode? Quickly OfficeConnect Remote FeaturesRemote 840 Panel 5OfficeConnect Remote 840 Back Panel DIP Switch Modes Following shows the areas of configuration for each ConfigurationLocal Site LAN, Remote Site WAN, and Global configuration. Overview Remote Test the network accessibilityCheck the routing tables on configured protocols 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 Access UsingManager to Restore Updating Controlling Snmp Access 6CHAPTER 2 System Administration Send an unsolicited message to a Snmp manager Assigning SnmpTrap Managers Instructions 8CHAPTER 2 System Administration Divided into the following parts Remote Site ManagementRemote Site 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 Information Configuring ATMCheck the Enable Remote Site box ATM Modify Screen Configuring ATM Information Monitoring Remote ConfiguringProtocol Parameters Site Connections Configuring IP Routing Overview Access the IP Screen through Configuration Global IP IP Select Configuration Local Site LAN IP Network Necessary Configuring IP RIPOn the LAN Advanced RIP Resetting Parameters Connection Configuring IP forConfiguring IP Parameters for Local WAN IP Address Network InformationComplete the following entries Remote WAN IP Address On a Remote Site Sites IP Static and Framed Configuring IPSite Select Configuration Remote Sites WAN Routes IP Route Using IP Address Validation Monitoring Ping no route to host Ping timeout waiting for reply from IP AddressPing Responses IPAddress is alive 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 Monitor Networks Network Status table Select Configuration Local Site LAN BridgeBridging for Adding a Bridge To that remote site Profile, and then you modify the profile to enable bridgingConnections Monitor Network Network Status table Bridging IP Traffic 6CHAPTER 5 Configuring Bridging Bridge Firewall Check the Enable MAC Encapsulated Routing box to enable MACOfficeConnect Remote 840 can be configured for simultaneous 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 Viewing Bridge Testing BridgingMonitoring Bridging From the addresses 12CHAPTER 5 Configuring Bridging Network Address Translation Using the Officeconnect Remote Selecting Address TranslationPage PAT Port Entries Configuring StaticData Protocol UDP button to access the static port tables 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 Responds with Configuring DhcpDhcp Overview An IP address for the workstation 2CHAPTER 7 Configuring Dhcp Dhcp Server Dhcp Relay Dhcp Smart ModeAccess the Monitor Networks Dhcp Dhcp leases screen 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 Both Configuring IPXCheck the Enable IPX checkbox Established Select the remote site to modify, and click Modify Click Framed Routes Real-time via SAP packet exchange between routers ServicesServices include file servers and printers 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 Software to InstallingOperational 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 Traffic Creating Filters OverviewCreating Filters Bridge filter in this example Creating Filters Using the OfficeConnect Remote 840 Manager 12-6CHAPTER 12 Configuring Filters Filter Create/Modify Filter Screens Filter IndexFilter Status 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 Disable the filter by unchecking the Enable Filter checkbox Go to Configuration Global FiltersFilter Using 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 Decide Bridging and RoutingRouting Concepts Terrestrial and satellite links 2APPENDIX a Bridging and Routing How Bridges Learn A-3 4APPENDIX a Bridging and Routing How Bridges Learn A-5 Structure, NetworkOrganization 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 Introduction to IP Administrators that are new to the IP protocolIP Addressing 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 Static NAT Port AddressTranslation PAT PAT Example Figure C-2 PAT Example 6APPENDIX C Address Translation Tutorial Documentation Using the CLI GuideAccessing the CLI 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 Telecommuting Planning Form from of the Installation Guide by enteringInformation from your remote site network administrator 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 Local IPX Network These steps Configuration AuditAudit Follow these steps Testing Saving Network Supplier Online TechnicalSupport from Your 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