Paradyne Routers manual Address Resolution Protocol ARP, Proxy ARP

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Configuring the DSL Router

Address Resolution Protocol (ARP)

Address Resolution Protocol, as specified in RFC 826, is supported in the DSL router. The DSL router provides for a total of 265 ARP table entries. The timeout for completed and uncompleted ARP table entries is configurable.

NOTE:

The DSL router does not process ARP requests and ARP responses on its DSL interface when it is configured to support RFC 1483 PDU routing (Standard mode). See Routed vs. Bridged PDUs on page 3-10 for more information. The operating mode (Standard or VNET) can be changed from the DSL card without requiring any reconfiguration of the DSL router. If any static ARP entries have been configured, they will remain in the database and can be displayed with the show arp command. You can create static ARP entries regardless of the current operating mode.

The Command Line Interface provides the ability to:

HCreate up to 64 static ARP table entries to be retained across power cycles.

HDisplay the ARP table.

HDelete ARP table entries.

HDisplay and delete automatically added static ARP table entries by the DHCP server and relay functions. Refer to Dynamic Host Configuration Protocol (DHCP) Server on page 3-7.

Proxy ARP

The DSL router supports Proxy ARP. Proxy ARP responses are based on the IP Routing table contents. The IP Routing table must have an entry for every host that is reachable on the Ethernet interface, including hosts for which the DSL router will not forward packets because of IP filters. If an ARP request is received on one interface for an IP address that is reachable on the other interface, the DSL router will respond with its own MAC address.

NOTE:

The Proxy ARP option is not available on the DSL interface when the DSL router is configured to support RFC 1483 PDU routing. See Routed vs. Bridged PDUs on page 3-10 for more information.

The Command Line Interface provides the ability to enable and disable Proxy

ARP for each interface.

NOTES:

ÐWhen Basic NAT is enabled, the DSL interface (dsl1) must have Proxy ARP enabled if the dsl1 interface address is part of the Basic NAT global IP network address.

ÐProxy ARP and NAPT cannot be enabled at the same time.

6371-A2-GB20-10

August 2000

3-5

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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 Document Purpose and Intended Audience About This GuideSection Description Document SummaryDocument Number Document Title Product-Related DocumentsSyntax Translation Document ConventionsWhat is a Hotwire DSL Router? Introduction to Hotwire DSL RoutersDSL Technologies Supported Typical DSL Router System Network Access Provider NAPOptional IP routing with Hotwire DSL Router FeaturesService Subscriber Access Control to the DSL Router Accessing the DSL RouterLevels of Access Local Console Access Changing Access Session LevelsAdmin enable Show consoleCUSTOMER#. Type configure terminal and press Enter Setting Up the New Users LoginInvalid Characters Value Ascii Hex Translation Determining the Current Access Level Telnet AccessDetermining the Available Commands Local console disabled by conflictExiting from the System Using the List CommandChanging the System Identity Manually Logging Out If you are accessing the DSL router ThenAutomatically Logging Out Overview of DSL Router Configuration Configuring the DSL RouterInterfaces for the DSL Router Ethernet and DSL Interface Identifiers Service Domain IP Address AssignmentsUnnumbered DSL Interface Numbered DSL InterfaceSimplified Network Topology Network Considerations IP RoutingProxy ARP Address Resolution Protocol ARPBasic NAT Network Address Translation NATNetwork Address Port Translation Napt IP Options Processing Dynamic Host Configuration Protocol Dhcp ServerApplications Supported by NAT Dhcp Relay Agent IP Filtering SecurityLand Bug/Smurf Attack Prevention Routed vs. Bridged PDUs Routed Network Model Standard modeConfiguration Examples DSL Router Configuration ExamplesCustomer Premises CP Basic Configuration ExampleNAT Mapping Public IP Addresses Private IP Addresses Basic NAT Configuration ExampleNapt Mapping Public IP Addresses Private IP Addresses Napt Configuration ExampleCore Router 155.1.3.253 Console Port Connection Dhcp Relay with Proxy ARP Configuration Example Public IP Addresses for Basic NAT Private IP Addresses Dhcp Server with Basic NAT Configuration ExampleDownstream Router Configuration Example Monitoring the DSL Router Detecting ProblemsWhat to Monitor Show interface Status of InterfacesShow interface eth1 dsl1 ± Ethernet Link up downShow statistics Interface StatisticsShow statistics eth1 dsl1 ip List of Discard Reasons Clearing StatisticsClear statistics eth1 dsl1 ip Discard Reasons for the Ethernet Interface eth1 1Discard Reasons for the DSL Interface dsl1 1 Discard Reasons for the Ethernet Interface eth1 2Discard Reasons for IP Discard Reasons for the DSL Interface dsl1 2Diagnostics and Troubleshooting Overview Diagnostics and TroubleshootingAlarms Inquiry Show alarmsSystem Log Syslog enable disableShow syslog Syslog ip ip-addrSyslog level level Syslog EventsShow log number Syslog Messages 1 Level Description EventSyslog Messages 2 Level Description Event Syslog Message DisplayReporting Ping Test Results PingPing reply x.x.x.x bytes of data=nn Ping reply x.x.x.x Request Timed OUTTraceRoute Test Results TraceRouteX.x Command Line Interface Feature Command Line InterfaceNavigation Command RecallDocument Conventions Configuration Control Commands Command Line Interface CommandsRFC 1483 Encapsulation Ethernet Frame FormatInterface and Service Domain IP Address Delete eth1ifn dsl1ifn IP Routing TableIp route create dest-ipdest-mask next-hop-ip remote Ip route purge Proxy ARP ARP TableNat napt enable Nat basic enableNat timeout time Nat basic address ip-addrip-maskNat napt delete udp tcp port Nat basic delete private-ipDhcp server enable disable Nat disableDhcp Server Nat purgeDhcp Relay Agent IP processing enable disable IP multicast enable disableTrap disable enable name of trap IP Packet ProcessingShow config Show Command OutputsNAT disabled or NAT enabled basic NAT Napt NAT timeout xx minutes NAT basic mappings Show arp timeoutShow ip route ip-address Show arpShow traps Show NAT naptShow dhcp server Show Dhcp relay Show alarms Show syslog Show log #Show interface Show statistics Sample show dhcp relay displayConfiguration Default Settings Configuration Defaults Command Line ShortcutsAbc123 ParadyneBytes CustomerTable B-2. Command Line Input Shortcuts 1 Command Line Input ShortcutsTable B-2. Command Line Input Shortcuts 2 Show interface dsl1 eth1 Table B-2. Command Line Input Shortcuts 3Configuration Defaults & Command Line Shortcuts Snmp Overview Traps & MIBsTraps Overview Variable Binding DSL Router TrapsStandard MIBs MIBs OverviewMIB II RFC System GroupSystem Ssssssssssss Boot bb.bb.bb 2nd Boot xx.xx.xx DSPInterfaces Interfaces Group RFCIfEntry Yy.yy.yy H/W Releasezzz CCA part numberºIfOperStatus Specifies the current DSL interface Extension to Interfaces Table RFC Table C-5. IP Group Objects 1 Description Setting/ContentsIP Group RFC IP Cidr Route Group RFC Table C-5. IP Group Objects 2 Description Setting/ContentsIpCidrRouteEntry 11 ± Transmission GroupEthernet-Like MIB RFC Snmp GroupDevice Control MIB Paradyne Enterprise MIBsNoOp1 Active1Device Diagnostics MIB Traceroute ApplpingTestEntryApplTracerouteResultsEntry ConfigureAppTracerouteResultsEntry DevStatus1 Health and Status MIBDevStatus Factory1-to-active8 Configuration MIBPdnInetIpAddressTableEntry Interface Configuration MIBPrimary SecondaryDhcp MIB DSL Endpoint MIB Syslog MIB DSL Router Terminal Emulation Accessing the List Command OutputDSL Router Terminal Emulation Terminal Emulation Programs Numbers IndexIN-2 IN-3