Paradyne Routers manual IP Routing, Network Considerations

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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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Contents HOTWIRE DSL Routers Copyright E 2000 Paradyne Corporation All rights reserved Contents Configuring the DSL Router Monitoring the DSL Router Index About This Guide Document Purpose and Intended AudienceDocument Summary Section DescriptionProduct-Related Documents Document Number Document TitleDocument Conventions Syntax TranslationIntroduction to Hotwire DSL Routers What is a Hotwire DSL Router?DSL Technologies Supported Network Access Provider NAP Typical DSL Router SystemOptional Hotwire DSL Router Features IP routing withService 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 CUSTOMER#. Type configure terminal and press EnterInvalid Characters Value Ascii Hex Translation Telnet Access Determining the Current Access LevelDetermining the Available Commands Local console disabled by conflictUsing the List Command Exiting from the SystemChanging the System Identity If you are accessing the DSL router Then Manually Logging OutAutomatically Logging Out Configuring the DSL Router Overview of DSL Router ConfigurationInterfaces for the DSL Router Service Domain IP Address Assignments Ethernet and DSL Interface IdentifiersNumbered DSL Interface Unnumbered DSL InterfaceSimplified Network Topology IP 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 Security IP FilteringLand Bug/Smurf Attack Prevention Routed Network Model Standard mode Routed vs. Bridged PDUsDSL Router Configuration Examples Configuration ExamplesBasic Configuration Example Customer Premises CPBasic NAT Configuration Example NAT Mapping Public IP Addresses Private IP AddressesNapt Configuration Example Napt Mapping Public IP Addresses Private IP AddressesCore Router 155.1.3.253 Console Port Connection Dhcp Relay with Proxy ARP Configuration Example Dhcp Server with Basic NAT Configuration Example Public IP Addresses for Basic NAT Private IP AddressesDownstream Router Configuration Example Detecting 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 Discard Reasons for the Ethernet Interface eth1 1Discard Reasons for the Ethernet Interface eth1 2 Discard Reasons for the DSL Interface dsl1 1Discard Reasons for the DSL Interface dsl1 2 Discard Reasons for IPDiagnostics and Troubleshooting Diagnostics and Troubleshooting OverviewAlarms Inquiry Show alarmsSyslog enable disable System LogShow syslog Syslog ip ip-addrSyslog Events Syslog level levelShow log number Syslog Messages 1 Level Description EventSyslog Message Display Syslog Messages 2 Level Description EventReporting Ping Ping Test ResultsPing reply x.x.x.x bytes of data=nn Ping reply x.x.x.x Request Timed OUTTraceRoute TraceRoute Test ResultsX.x Command Line Interface Command Line Interface FeatureCommand Recall NavigationDocument Conventions Command Line Interface Commands Configuration Control CommandsRFC 1483 Encapsulation Ethernet Frame FormatInterface and Service Domain IP Address IP Routing Table Delete eth1ifn dsl1ifnIp route create dest-ipdest-mask next-hop-ip remote Ip route purge ARP Table Proxy ARPNat basic enable Nat napt enableNat timeout time Nat basic address ip-addrip-maskNat basic delete private-ip Nat napt delete udp tcp portNat disable Dhcp server enable disableDhcp Server Nat purgeDhcp Relay Agent IP multicast enable disable IP processing enable disableTrap disable enable name of trap IP Packet ProcessingShow Command Outputs Show configNAT disabled or NAT enabled basic NAT Napt Show arp timeout NAT timeout xx minutes NAT basic mappingsShow ip route ip-address Show arpShow NAT napt Show trapsShow dhcp server Show alarms Show syslog Show log # Show Dhcp relayShow interface Show statistics Sample show dhcp relay displayConfiguration Defaults Command Line Shortcuts Configuration Default SettingsParadyne Abc123Bytes CustomerCommand Line Input Shortcuts Table B-2. Command Line Input Shortcuts 1Table B-2. Command Line Input Shortcuts 2 Table B-2. Command Line Input Shortcuts 3 Show interface dsl1 eth1Configuration Defaults & Command Line Shortcuts Traps & MIBs Snmp OverviewTraps Overview DSL Router Traps Variable BindingMIBs Overview Standard MIBsMIB II RFC System GroupSsssssssssss Boot bb.bb.bb 2nd Boot xx.xx.xx DSP SystemInterfaces Group RFC InterfacesIfEntry Yy.yy.yy H/W Releasezzz CCA part numberºIfOperStatus Specifies the current DSL interface Table C-5. IP Group Objects 1 Description Setting/Contents Extension to Interfaces Table RFCIP Group RFC Table C-5. IP Group Objects 2 Description Setting/Contents IP Cidr Route Group RFCTransmission Group IpCidrRouteEntry 11 ±Snmp Group Ethernet-Like MIB RFCParadyne Enterprise MIBs Device Control MIBNoOp1 Active1Device Diagnostics MIB ApplpingTestEntry TracerouteConfigure ApplTracerouteResultsEntryAppTracerouteResultsEntry Health and Status MIB DevStatus1DevStatus Configuration MIB Factory1-to-active8Interface Configuration MIB PdnInetIpAddressTableEntryPrimary SecondaryDhcp MIB DSL Endpoint MIB Syslog MIB Accessing the List Command Output DSL Router Terminal EmulationDSL Router Terminal Emulation Terminal Emulation Programs Index NumbersIN-2 IN-3