Lab 4: DHCP Relay with ip helper-address

Bundle lab · $29.99

Configure a centralized DHCP server on an IOS-XE router and relay DHCP from a remote branch LAN using ip helper-address on a branch router. Verify leases, helper configuration, and end-host reachability across a routed path.

Track

CCNA

Est. time

40 minutes

Difficulty

Intermediate

Topics

CCNA, DHCP, DHCP Relay, Cisco IOS-XE, Static Routing

Learning objectives

Configure an IOS-XE router as a DHCP server with pool options and exclusions
Relay DHCP using ip helper-address on a remote router interface
Verify DHCP operation using show ip dhcp binding and client-side Linux tools
Understand return-path routing requirements for centralized DHCP

Troubleshooting focus

A missing or incorrect ip helper-address prevents broadcast DISCOVER from reaching the DHCP server
Pool network/mask does not match the client subnet, so the server refuses or misconfigures leases
Default-router option refers to the wrong gateway, breaking connectivity even with a lease
Excluded-address range removes all usable addresses, so no leases are assigned
Return path missing on the DHCP server, so OFFER/ACK cannot reach the clients

Topology

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What's included in the package

Work / baseline CML import — lab-work.yaml
Topology diagram — topology.svg
Print-ready topology diagram (PDF) — topology.pdf
Step-by-step learner guide (Markdown — for Obsidian/VS Code) — lab-guide.md
Branded PDF lab guide — open in any viewer (Adobe/Preview) — lab-guide.pdf
Getting-started README — README.md
Verification checklist — verification-checklist.md

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Lab 4: DHCP Relay with ip helper-address

Learning objectives

Troubleshooting focus

Topology

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