dhcpv4: handle DHCPNAK by returning to discover - #58
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NAKs were dropped before dispatch because the required-options check (netmask, gateway, lease time, server id) ran ahead of the message-type switch, and a NAK carries none of those. Require only the message type up front, check the full option set inside OFFER/ACK, and on NAK in REQUESTING or BOUND state restart discovery. Co-Authored-By: Claude <noreply@anthropic.com>
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NAKs were dropped before dispatch because the required-options check (netmask, gateway, lease time, server id) ran ahead of the message-type switch, and a NAK carries none of those. Require only the message type up front, check the full option set inside OFFER/ACK, and on NAK in REQUESTING or BOUND state restart discovery.