Mahesh Jethanandani <[email protected]> wrote: > See below for the discussion on the second paragraph of Section 3.2.2.
>> > 4) The DE guidance has the following text but I am not sure that I
understand
>> > what this means. This needs a reference to some relevant specification
that
>> > explains the encoding in question.
>> >
>> > "When the contents of the link type can contain an IPv4 or IPv6
header, then
>> > the octets between the beginning of the link type and the IP header
needs to be
>> > clear."
>>
>> I *think* the idea is that, *if* you can encapsulate IPv4 or IPv6 packet
in that link type, the specification should describe everything from the
beginning of the packet to the IP header", i.e. "don't leave anything out".
>>
>> I'm not sure what the purpose of that is. Michael?
KT> IOW, it is asking for a specification of that link type's
KT> header/packet format. If so, would it be better to say that directly?
KT> But then, the DE cannot make this determination if a reference is not
KT> provided/available? In summary, please see if the DE guidance can be
KT> more precise.
There is some back and forth by unicast that I won't repeat.
Please suggest better wording, but the DE is not going to fix the
specification!
This point is raised because it is a place where specifications have
sometimes fallen short or been vague. No specification is required.
For example, there are DLTs that describe USB captures. And we could have
new variations. IP packets *could* be there via PPP over USB Modem, ACM,
or Serial port. (That's three different USB profiles, I think)
There are also 2-3 different ways to do Ethernet over USB that could contain IP.
But, the DE should *not* insist that the spec says how to find the IP header;
as it would be tied up in all the ethernet formats, etc.
So the suggested text, "... if you can" would be far too strong advice.
The spec could say, "here be ethernet", which would be enough.
--
Michael Richardson <[email protected]> . o O ( IPv6 IøT consulting )
Sandelman Software Works Inc, Ottawa and Worldwide
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