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Paradyne Routers manual IP Routing, Network Considerations, Ð Applications Supported by NAT

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Configuring the DSL Router

IP Routing

The DSL router uses destination-based routing for downstream traffic. An IP Routing Table is maintained to specify how to forward IP datagrams downstream. The DSL router is capable of supporting 32 entries in the IP Routing Table. This table can be viewed by both Operator and Administrator access levels.

The DSL router uses source-based forwarding for upstream traffic to ensure that packets are forwarded to the upstream router specified for the configured Service Domain.

Refer to Chapter 4, DSL Router Configuration Examples, for further details.

Network Considerations

The DSL routers can be configured to function in a variety of network environments. The following sections provide descriptions of some of the DSL router features:

HAddress Resolution Protocol (ARP)

HProxy ARP

HNetwork Address Translation (NAT)

ÐBasic NAT

ÐNetwork Address Port Translation (NAPT)

ÐIP Options Processing

ÐApplications Supported by NAT

HDynamic Host Configuration Protocol (DHCP) Server

HDHCP Relay Agent

HSecurity

ÐIP Filtering

ÐLand Bug/Smurf Attack Prevention

HRouted vs. Bridged PDUs

3-4

August 2000

6371-A2-GB20-10

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Paradyne Routers manual IP Routing, Network Considerations, H Address Resolution Protocol ARP H Proxy ARP

Contents

HOTWIRE DSL ROUTERS USERS GUIDEDocument No. 6371-A2-GB20-10 AugustWarranty, Sales, Service, and Training Information Copyright E 2000 Paradyne Corporation All rights reservedPrinted in U.S.A Document FeedbackContents 1 Introduction to Hotwire DSL Routers2 Accessing the DSL Router About This GuideConfiguring the DSL Router DSL Router Configuration ExamplesContents 6 Diagnostics and Troubleshooting A Command Line Interface5 Monitoring the DSL Router ContentsB Configuration Defaults & Command Line Shortcuts C Traps & MIBsD DSL Router Terminal Emulation IndexAbout This Guide Document Purpose and Intended AudienceDocument Summary ChapterAppendix A Appendix BProduct-Related Documents Document NumberDocument Title Document Conventions SyntaxTranslation ItalicsIntroduction to Hotwire DSL Routers What is a Hotwire DSL Router?DSL Technologies Supported Typical DSL Router System Hotwire DSL Router Features H High-speed Internet or intranet accessH IP routing with H Console Terminal Interface. Provides an interface forService Subscriber Accessing the DSL Router Access Control to the DSL RouterLevels of Access Changing Access Session Levels Local Console Accessadmin enable show consoleSetting Up the New Users Login ProcedureCUSTOMER#. Type configure terminal and press Enter CUSTOMER - CONFIG#Telnet Access Determining the Current Access LevelDetermining the Available Commands Local console disabled by conflictUsing the List Command H list configExiting from the System Changing the System IdentityIf you are accessing the DSL router Manually Logging OutAutomatically Logging Out ThenConfiguring the DSL Router Overview of DSL Router ConfigurationInterfaces for the DSL Router H DSL InterfaceService Domain IP Address Assignments Ethernet and DSL Interface IdentifiersH Ethernet Interface Numbered DSL Interface Unnumbered DSL InterfaceSimplified Network Topology H Address Resolution Protocol ARP H Proxy ARP H Dynamic Host Configuration Protocol DHCP Server H DHCP Relay AgentIP Routing Network ConsiderationsAddress Resolution Protocol ARP Proxy ARPNetwork Address Translation NAT Basic NATNetwork Address Port Translation NAPT Dynamic Host Configuration Protocol DHCP Server IP Options ProcessingApplications Supported by NAT DHCP Relay Agent ExamplesSecurity IP FilteringLand Bug/Smurf Attack Prevention H Land Bug/Smurf Attack Prevention ± Always presentIf Using This Network Model Figure 3-1. 1483 Routed Network Model Standard modeRouted vs. Bridged PDUs 3-10DSL Router Configuration Examples Configuration ExamplesBasic Configuration Example ifn address eth1 155.1.3.254 ifn address dsl1 155.1.4.254ip route create upstream eth1 Basic NAT Configuration Example nat basic map 192.128.1.1 10.1.3.2 10.1.3.5 nat basic enableNAT Mapping Public IP Addresses Private IP AddressesNAPT Configuration Example nat napt map tcp 10.1.3.4 23 nat napt enableNAPT Mapping Public IP Addresses Private IP AddressesUnnumbered DSL Interface with Proxy ARP Configuration Example ip route create upstream eth1 155.1.3.253 proxy arp eth1 enableproxy arp dsl1 enable DHCP Relay with Proxy ARP Configuration Example proxy arp dsl1 enable dhcp relay enable dhcp relay addressip route create upstream eth1 155.1.3.253 proxy arp eth1 enable DHCP Server with Basic NAT Configuration Example nat basic address 192.128.1.0 nat basic enabledhcp server enable Public IP Addresses for Basic NATDownstream Router Configuration Example ip route create 130.26.7.0 255.255.255.0Detecting Problems Monitoring the DSL RouterWhat to Monitor Status of Interfaces show interfaceshow interface eth1 dsl1 ± Ethernet Link up downInterface Statistics show statisticsshow statistics eth1 dsl1 ip Clearing Statistics List of Discard Reasonsclear statistics eth1 dsl1 ip Table 5-1. Discard Reasons for the Ethernet Interface eth1 1 ofTable 5-1. Discard Reasons for the Ethernet Interface eth1 2 of Table 5-2. Discard Reasons for the DSL Interface dsl1 1 ofDiscard Reasons for the DSL Interface dsl1 Monitoring the DSL RouterTable 5-2. Discard Reasons for the DSL Interface dsl1 2 of Table 5-3. Discard Reasons for IP Discard Reasons for IPMonitoring the DSL Router Discard Reasons for the DSL Interface dsl1Diagnostics and Troubleshooting Diagnostics and Troubleshooting OverviewAlarms Inquiry show alarmssyslog enable disable System Logshow syslog syslog ip ip-addrSYSLOG Events syslog level levelshow log number Table 6-1. SYSLOG Messages 1 ofSYSLOG Message Display Table 6-1. SYSLOG Messages 2 ofLevel DescriptionPing Ping Test ResultsPing reply x.x.x.x bytes of data=nn Ping reply x.x.x.x REQUEST TIMED OUTTraceRoute TraceRoute Test ResultsTracing route to x.x.x.x over a max of nn hops with nnn byte packet Round Trip TimeCommand Line Interface Command Line Interface FeatureRefer to Appendix B, Configuration Defaults & Command Line Shortcuts Command Recall NavigationDocument Conventions SyntaxCommand Line Interface Commands Configuration Control Commandsconfigure terminal factory RFC 1483 EncapsulationInterface and Service Domain IP Address ifn address eth1ifn dsl1ifn ip-address mask primaryifn dsl1ifn eth1ifn primary ifn address dsl1 unnumbered Examples ifn address dsl1 135.300.41.8 ifn dsl1 primaryIP Routing Table delete eth1ifn dsl1ifnip route create dest-ip dest-mask next-hop-ip remote Example Refer to Chapter 4, DSL Router Configuration Examplesip route create upstream eth1ifn next-hop-ip ip route delete upstream eth1ifnip route purge Example Refer to Chapter 4, DSL Router Configuration Examplesarp timeout incomplete time arp timeout complete timeproxy arp eth1 dsl1 enable disable ARP Tablenat basic enable nat napt enablenat timeout time nat basic address ip-addr ip-masknat basic delete private-ip nat napt delete udp tcp portExample nat basic map 192.128.1.1 Example nat basic deletenat disable dhcp server enable disableDHCP Server A-10dhcp relay enable disable DHCP Relay AgentA-11 dhcp server router ip-addressIP multicast enable disable IP processing enable disabletrap disable enable name of trap IP Packet ProcessingShow Command Outputs show console Displays console enabled or console disabled show systemshow config A-13show arp timeout A-14show ip route ip-address show arpA-15 show NAT naptshow traps show dhcp servershow alarms show syslog show log # A-16show DHCP relay show interface show statisticsConfiguration Defaults Command Line Shortcuts Configuration Default SettingsTable B-1. Default Configuration Settings Configuration Option2 of Table B-1. Default Configuration SettingsConfiguration Option Factory Default SettingCommand Line Input Shortcuts Table B-2. Command Line Input Shortcuts 1 of1483encap llc vc arp purgeTable B-2. Command Line Input Shortcuts 2 of ip route delete upstream eth1ifn ip route purge list config logoutnat basic enable nat disableTable B-2. Command Line Input Shortcuts 3 of show interface dsl1 eth1show nat basic napt show statistics dsl1 eth1 ip show syslog show systemConfiguration Defaults & Command Line Shortcuts 6371-A2-GB20-10Traps & MIBs SNMP OverviewTraps Overview DSL Router Traps Table C-1. DSL Router TrapsTrap EventTrap # SeverityMIBs Overview Standard MIBsMIB II RFC System GroupSetting/Contents Table C-2. System Group ObjectsObject ssssssssssss Boot bb.bb.bb 2nd Boot xx.xx.xx DSPInterfaces Group RFC Table C-3. Interfaces Group Objects 1 ofSetting/Contents ObjectTable C-3. Interfaces Group Objects 2 of Setting/ContentsObject DescriptionExtension to Interfaces Table RFC IP Group RFCTable C-4. Extension to Interfaces Table Table C-5. IP Group Objects 1 ofIP CIDR Route Group RFC Table C-5. IP Group Objects 2 ofTable C-6. IP CIDR Route Group Objects 1 of Setting/ContentsTransmission Group Table C-6. IP CIDR Route Group Objects 2 ofSetting/Contents ObjectSNMP Group Ethernet-Like MIB RFCC-10 H Device Diagnostics MIB pdndiag.mib H Configuration MIB pdnConfig.mibH Interface Configuration MIB pdninet.mib H Interface Configuration MIB pdnIfExtConfig.mibDevice Diagnostics MIB C-12Table C-8. Application Test Group Objects 1 of Setting/ContentsC-13 Table C-8. Application Test Group Objects 2 ofSetting/Contents ObjectC-14 Table C-8. Application Test Group Objects 3 ofSetting/Contents configureHealth and Status MIB C-15Table C-9. Device Status Group Objects Table Setting/ContentsConfiguration MIB Table C-10. Device Configuration Copy Group Objects TableC-16 Setting/ContentsInterface Configuration MIB Table C-11. Interface Configuration Group Objects TableARP MIB NAT MIBDHCP MIB C-18Table C-12. DSL Endpoint Configuration Group Objects Table DSL Endpoint MIBC-19 Setting/ContentsSYSLOG MIB C-20Interface Configuration MIB Accessing the List Command Output DSL Router Terminal EmulationDSL Router Terminal Emulation Terminal Emulation Programs ProcedureProcedure Symbols IndexNumbers IN-1IN-2 IN-3