Re: [dhcwg] Minor inconsistencies with draft-ietf-dhc-packetcable-04.txt

Ted Lemon <Ted.Lemon@nominum.com> Thu, 14 November 2002 16:55 UTC

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Date: Thu, 14 Nov 2002 10:46:43 -0600
Subject: Re: [dhcwg] Minor inconsistencies with draft-ietf-dhc-packetcable-04.txt
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To: Bud Millwood <budm@weird-solutions.com>
From: Ted Lemon <Ted.Lemon@nominum.com>
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> Second, I'd rather see suboption 3 broken out into two different 
> suboptions
> denoting the different data types. I'm not aware of any other DHCP 
> option
> that has a type field.

This is an excellent point.   Options with variable formats _always_ 
require special code in the DHCP server to support them.   I think the 
authors should choose either an IP address or an FQDN as the format in 
which the SIP server's IP address is communicated.   If this is not 
possible, then the draft should at least be consistent with the SIP RFC 
(rfc3361), which does something similar, but chooses exactly the 
opposite meaning for the flag byte.

The problem with allowing the option to contain either an FQDN or an IP 
address is that now the DHCP server has to have special code to support 
this specific option.   Most DHCP servers (well, admittedly, I only 
have experience with two) are table-driven with respect to option 
formats, so this is a big deal.   For example, because of the need for 
a special hack, I don't know when or if the ISC DHCP server will 
support the SIP option described in rfc3361, since I am no longer 
working on it.   If SIP had chosen one or the other format, it would 
already be supported.

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