DHCP: Verify Leases, Pools and Conflicts

Bundle lab · $29.99

Hands-on IOS DHCP server practice focused on validating pool state, inspecting conflicts, and fixing a real address conflict caused by a legacy static host on the LAN. You will verify server-side leases and exclusions, observe a conflict entry, then permanently exclude the static IP and clear the stale conflict so a client can obtain a clean address.

Learning objectives

• Configure and validate an IOS DHCP server with correct pool scope and options
• Detect an address conflict using 'show ip dhcp conflict' and interpret detection methods
• Permanently exclude a statically assigned IP to prevent future conflicts
• Clear stale conflict entries and re-attempt client lease acquisition
• Verify server-side state with 'show ip dhcp pool' and 'show ip dhcp binding', and client state from Linux (udhcpc, ip addr, ping)

Troubleshooting focus

• Client fails to obtain a lease due to an active conflict entry
• Pool statistics do not match expectations (exclusions vs. leased)
• Client gets an address but cannot reach the gateway (check link, ARP, and default route learned by DHCP)
• Misread of 'show ip dhcp binding' vs 'show ip dhcp conflict' leading to wrong conclusion