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Paradyne Routers manual DHCP Relay Agent, Examples

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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.

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August 2000

6371-A2-GB20-10

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Paradyne Routers manual DHCP Relay Agent, Examples

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 GuideDSL Router Configuration Examples Configuring the DSL RouterContents 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 BDocument Number Product-Related DocumentsDocument Title Document Conventions SyntaxTranslation ItalicsWhat is a Hotwire DSL Router? Introduction to Hotwire DSL RoutersDSL 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 Access Control to the DSL Router Accessing 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 InterfaceEthernet and DSL Interface Identifiers Service Domain IP Address AssignmentsH Ethernet Interface Unnumbered DSL Interface Numbered 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 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 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 Examplesifn address eth1 155.1.3.254 ifn address dsl1 155.1.4.254 Basic Configuration Exampleip 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 Addressesip route create upstream eth1 155.1.3.253 proxy arp eth1 enable Unnumbered DSL Interface with Proxy ARP Configuration Exampleproxy arp dsl1 enable proxy arp dsl1 enable dhcp relay enable dhcp relay address DHCP Relay with Proxy ARP Configuration Exampleip 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 130.26.7.0 255.255.255.0Monitoring 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 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 Feature Command Line InterfaceRefer 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-GB20-10SNMP Overview Traps & MIBsTraps 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 ObjectEthernet-Like MIB RFC SNMP GroupC-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/ContentsC-20 SYSLOG MIBInterface Configuration MIB DSL Router Terminal Emulation Accessing the List Command OutputDSL Router Terminal Emulation Procedure Terminal Emulation ProgramsProcedure Symbols IndexNumbers IN-1IN-2 IN-3