Lab 3: Full DHCP Pool — Gateway, DNS, Domain, Lease

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Configure an IOS-XE router as a DHCP server delivering a complete, production-grade option set (gateway, DNS servers, domain suffix, explicit 8-hour lease) to two Alpine Linux clients over a pure L2 access switch. Validate that clients obtain dynamic addresses in-scope and that /etc/resolv.conf reflects the delivered DNS and domain options. The graded outcome is the deterministic router DHCP configuration — not the clients’ dynamic addresses.

Learning objectives

• Build a correctly scoped IOS DHCP pool for a /24 LAN with network/mask
• Set default-router, dns-server (two IPs), domain-name, and an explicit 8-hour lease
• Protect the gateway address using ip dhcp excluded-address
• Verify leases and options via show ip dhcp binding and show running-config
• Confirm Alpine clients receive IP/DNS/domain via udhcpc and /etc/resolv.conf

Troubleshooting focus

• Pool network/mask must match the client LAN exactly; a mismatch prevents leases
• default-router must be the router’s real LAN IP; otherwise clients lose reachability
• Lease options (DNS, domain) appear in resolv.conf only if udhcpc completes successfully
• If no client leases appear, confirm the switch is pure L2 and the LAN interface is up/up
• Avoid excluding the entire usable range; only exclude the gateway as specified