DHCP capability query

parthiban Thiyagarajakumar patkumar82 at gmail.com
Tue May 19 08:35:33 UTC 2009

        Need some information about the capabilities of DHCP servers as per
the following.
      DHCP servers typically allocate IP address based on the MAC address in
the chaddr field. However, RFC 4361 (which updates RFC 2131), specifies
support for the Client ID option (which can be populated with the NAI).The
question is : If the client ID option is present, will the DHCP server use
that to allocate IP address?  In other words, can we assume compliance to
RFC 4361 for the DHCP server

RFC 3993: Subscriber ID option.  NWG stage 3 references this RFC.  The RFC
itself says the following for DHCP server.

DHCP Server Behavior

This suboption provides additional information to the DHCP server. If it is
configured to support this option, the DHCP server may use this information
in addition to other relay agent option data and other options included in
the DHCP client messages in order to assign an IP address and/or other
configuration parameters to the client. There is no special additional
processing for this suboption.

So is the DHCP server RFC 3993 compliant ?

       - Regards
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