Paradyne Routers manual Dhcp Relay Agent

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Configuring the DSL Router

HWhen the DHCP IP address range is changed, all binding entries, automatically added routes, and ARP table entries for the clients configured with the old address range are removed.

HWhen the DHCP Server is enabled, there can be only one service domain (Ethernet interface) configured.

HThe IP address for the next hop router that is provided to the hosts in the DHCP reply must be configured.

HThe subnet mask can be configured along with the IP address range (optional).

HThe DHCP server domain name can be configured (optional).

HThe Domain Name Server (DNS) IP address can be configured (optional).

HThe minimum and maximum lease time settings can be configured.

For additional information, refer to Chapter 4, DSL Router Configuration

Examples.

DHCP Relay Agent

The DSL router provides the capability of serving as a DHCP Relay Agent, as specified in RFC 2131, Dynamic Host Configuration Protocol. The DSL router provides the capability to enable and disable the DHCP Relay Agent and to configure the IP address of the DHCP server to which the DHCP requests are to be forwarded.

The DHCP server assigns an IP address to the end-user system. When DHCP Relay is enabled, it is possible to limit the number of DHCP clients. The DSL router's IP Routing table and ARP table are automatically updated. The DHCP relay agent in the DSL router should be used when there is a DHCP server upstream in the service domain. DHCP relay agent setup considerations:

HDHCP server IP address must be configured.

HDHCP relay must be enabled.

HThe number of DHCP clients can be limited to 1Ð256.

HDHCP server and DHCP relay functions cannot be enabled at the same time.

HNAT and DHCP relay cannot be enabled at the same time.

3-8

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 TranslationWhat is a Hotwire DSL Router? Introduction to Hotwire DSL RoutersDSL Technologies Supported Typical DSL Router System Network Access Provider NAPOptional Hotwire DSL Router Features IP routing withService Subscriber Access Control to the DSL Router Accessing the DSL RouterLevels of Access Changing Access Session Levels Local Console AccessAdmin enable Show consoleCUSTOMER#. Type configure terminal and press Enter Setting Up the New Users LoginInvalid Characters Value Ascii Hex Translation Telnet Access Determining the Current Access LevelDetermining 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 Service Domain IP Address Assignments Ethernet and DSL Interface IdentifiersUnnumbered DSL Interface Numbered DSL InterfaceSimplified Network Topology IP Routing Network ConsiderationsAddress Resolution Protocol ARP Proxy 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 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 Monitoring the DSL Router Detecting ProblemsWhat to Monitor Status of Interfaces Show interfaceShow interface eth1 dsl1 ± Ethernet Link up downShow statistics Interface 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 Messages 2 Level Description Event Syslog Message DisplayReporting Ping Ping Test ResultsPing 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 Command Line Interface FeatureNavigation Command RecallDocument Conventions Command Line Interface Commands Configuration Control 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 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 config Show Command OutputsNAT disabled or NAT enabled basic NAT Napt Show arp timeout NAT timeout xx minutes NAT basic mappingsShow ip route ip-address Show arpShow traps Show NAT naptShow 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 Snmp Overview Traps & MIBsTraps 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 Extension to Interfaces Table RFC Table C-5. IP Group Objects 1 Description Setting/ContentsIP 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 TracerouteApplTracerouteResultsEntry ConfigureAppTracerouteResultsEntry DevStatus1 Health and Status MIBDevStatus Configuration MIB Factory1-to-active8Interface Configuration MIB PdnInetIpAddressTableEntryPrimary SecondaryDhcp MIB DSL Endpoint MIB Syslog MIB DSL Router Terminal Emulation Accessing the List Command OutputDSL Router Terminal Emulation Terminal Emulation Programs Index NumbersIN-2 IN-3