Understanding DHCP: How I Configured and Captured It in a GNS3 Lab

This post demonstrates setting up a DHCP lab in GNS3 with a Cisco router as the DHCP server, a switch, and two VPCS clients, then captures and explains the full DORA (Discover, Offer, Request, ACK) handshake using Wireshark. The author walks through each packet's fields and addresses common questions such as why the Request is broadcast and what the Transaction ID is used for.