Configuring Dhcp Relay, Dhcp Server, and PAT | Cisco Systems 700

C H A P T E R 5

Configuring DHCP Relay, DHCP Server, and PAT

Cisco 700 series routers can perform the role of the relay agent, relaying IP configuration information request packets from the LAN interface, over the ISDN interface, to a specified Dynamic Host Configuration Protocol (DHCP) server. Cisco 700 series routers provide DHCP relay, DHCP server, Port Address Translation (PAT), and Internet Protocol Control Protocol (IPCP).

This chapter provides descriptions, application notes, and example configurations for configuring Dynamic Host Configuration Protocol (DHCP) relay, DHCP server, and Port Address Translation (PAT) on the Cisco 700 series router. It contains the following sections:

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DHCP Description

PAT Description

IPCP Description

PPP IPCP Negotiation Example

DHCP Relay with IPCP Negotiation Example

DHCP Server with IPCP Negotiation Example

PAT with IPCP Single-Destination Negotiation Example

DHCP Server and PAT with IPCP Single-Destination Negotiation Example

DHCP Server with PAT and IPCP Dual-Destination PPP Negotiation Example

Configuring DHCP Relay, DHCP Server, and PAT 5-1

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Cisco Systems 700 manual Configuring Dhcp Relay, Dhcp Server, and PAT

Contents

Cisco 700 Series Router Configuration Guide Page N T E N T S Chapter Using Chap Chapter Configuring Dhcp Relay, Dhcp Server, and PAT Token Caching A-2 About This Manual Related Documentation Conventions Set systemname systemname Supported Protocols Overview Software Images Administrative Configuration Options 4Cisco700 Series Router Command Reference Profile Overview Using Profiles with Cisco 700 Series Routers Profiles and Connections System and Profile Parameters Profile Mode Parameter Set System Mode Parameter Set Permanent Profiles Lists the parameters that can be configured in a profile Creating and Modifying Profiles Displaying Profile ConfigurationsRemoving Profile-Based Values Host set user tomd Incoming Calls HostProfile reset user tomdDeleting Profiles Changing Profile Names Outgoing Calls 8Cisco700 Series Router Configuration Guide Basic Configuration Concepts Basic Configurations Bridges and Routers ProfilesLANs and WANs Show config Current Configuration Remote and Central Sites Host show config Starting Point Password and SecretAdditional Reference Set def Set autodetection on Setting Spid Autodetection North America only Set switch dms Setting SPIDs Manually North America only Bridging Example Bridging with a Cisco 700 Series Router Cisco 700 Series Router Bridging Instructions Routing IP with a Cisco 700 Series Router to an ISP Connecting to an ISP-Example Configuration Routing a Cisco 700 Series Router to an ISP Instructions Routing IP to a Central SiteSet system 764 cd lan Set ip address Set user isp Set number Routing IP to a Central Site-Example Configuration Set system remote765 set multidestination on cd LAN Central Site IP Routing Command Summary Set ppp auth in chap set ppp secret host cd lan Routing IP and IPX On-Demand Routing IP and IPX On-Demand-Example Configuration Cd LAN On-Demand IP and IPX Routing with PPP Instructions Set bridging off Central Site On-Demand IP and IPX Routing with PPP Commands 18Cisco 700 Series Router Configuration Guide Using Chap Spid Detection North America only IP Static Routing and Callback with Chap Authentication Set switch 5ess Remote Cisco 765 Command SummarySet ip rip update off set timeout Set ip rip version 2 set user IP Static Routing with Chap Authentication and MLP Demand 2 threshold 32 duration 5 set active Reboot Set ip rip update periodic set user Set ppp secret client IP Static Routing with PAP Authentication IP Static Routing with PAP Authentication and MLP Set bridging off set timeout 360 set active reboot IP Unnumbered Static Routing and Chap with MLP IP Unnumbered Routing and Chap Authentication with MLP Set ppp secret host cd lan IP Static and IPX Static Routing with PPP IP Static and IPX Static Routing with Chap and MLP Set multidestination on Set ip rip update periodic set user 4500 IPX Static Routing with Chap and MLP Set ipx rip update periodic set user Multilink PPP Encapsulation Dynamic Routing ProtocolsSet ppp multilink off Bridging to a Router Running Cisco IOS Software 16Cisco700 Series Router Configuration Guide Configuring Dhcp Relay, Dhcp Server, and PAT Dhcp Server Application Notes Dhcp Description PAT Description Dhcp Relay Application NotesPAT Application Notes Ipcp Description Ipcp Address Negotiation Application NotesSet ip framing none PPP Ipcp Negotiation Example Cisco 765 Series Router Commands Verify the Configuration Dhcp Relay with Ipcp Negotiation ExampleSet system Dhcp Server with Ipcp Negotiation Example Set dhcp server Set dhcp gateway primary 172.168.1.1 cd lanSet user PAT with Ipcp Single-Destination Negotiation PAT with Ipcp Single-Destination Negotiation Example Set system Set ip pat po ftp 10.0.0.2 cd lan Dhcp Server with PAT and Ipcp Single-Destination Negotiation Set active Dhcp server Cisco Isdn network Set ip netmask 255.255.255.0 set ip pat on Verify the Configuration 16Cisco700 Series Router Configuration Guide Configuring Remote Capi Capi and RVS-COM Remote Capi Router Commands Supported D-Channel ProtocolsSupported Applications Configuring the Cisco 700 Router as an Rcapi Server Rcapi Command SummarySet rcapi on Set dir Local-router show rcapi status 6Cisco700 Series Router Configuration Guide Token Card and Cisco Secure Authentication Support Token Caching Figure A-2 PAP Client Packet 4Cisco700 Series Router Configuration Guide D E ISP Ipxcp RIP ARP BCP Chap Dhcp Icmp Ipcp Ipxcp ISDN-DCP Mlppp PAP PAT