It's used as a general identifier of the client in any situation, so
that the server can pass back specific options. Yes, this can be done
by looking at the client MAC address, but that's not sufficient in the
following cases:
1) non-Ethernet hardware addresses
2) dual-stack clients using DHCPv4 and DHCPv6
3) you change the NIC and want the same options
4) the NIC doesn't have a permanent MAC address
The client ID (and on the DHCPv6 side, the DUID) is the
single-identifier solution that should really be used instead of the MAC
address.
Touché
-
Thomas
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