NewClient creates a new DHCP client.

NewID generates a DHCPv4 client ID, per https://tools.ietf.org/html/rfc4361#section-6.1.

DuidEn is the DUID type; see https://tools.ietf.org/html/rfc3315#section-9.3.

VMwarePEN is VMware's PEN (Private Enterprise Number); see http://www.iana.org/assignments/enterprise-numbers/enterprise-numbers.

Duid is a vendor based DUID per https://tools.ietf.org/html/rfc3315#section-9.3.

ID is a DHCPv4 client ID.

Client represents a DHCP client.

Iaid is an opaque 32-bit identifier unique to a network interface; see https://tools.ietf.org/html/rfc4361#section-6.1.