Thanks Guy I'll try your suggestions tommorow; Thanks
for the help, and the good humour with which you
treated upon this subject. BTW I agree Nortel should
have got their own ethertype, but this dissector is
only meant for an in-house solution. I work in their
r'n'd and support offices in the lovely south of
france, so IPLT shouldn't be a problem, and it is
sunny enough down here to live with the problem if it
arises:)
But since my dad is a member of the IEE I agree they
should have applied for their 'own' ethertype.
Cheers all the best and thanks
Charles
--- Guy Harris <gharris@xxxxxxxxx> wrote:
> Charles Wilkinson wrote:
>
> > Right having decided that the only way to be
> > understood is to send out the source
>
> Good idea.
>
> OK, it appears that you're special-casing the IP
> protocol number field,
> and calling a completely separate dissector for this
> "Optical Ethernet"
> protocol. (I *still* think Nortel should have
> gotten a separate
> Ethertype for this protocol....)
>
> That's probably a reasonable way to handle this; it
> avoids having to
> have a preference setting (unless the "IPLT"
> protocol, to which IP
> protocol number 129 is assigned, according to
>
> http://www.iana.org/assignments/protocol-numbers
>
> is something other than "Optical Ethernet", and
> somebody contributes a
> dissector for "IPLT").
>
> It also appears that "hlen" is, indeed, the Optical
> Ethernet equivalent
> of the IP header length, meaning that using "hlen -
> 26" as the payload
> length is wrong, as per my other mail, and that the
> total length field
> is used to set the length of the tvbuff, as per my
> other mail, so try
> setting next_tvb with
>
> next_tvb = tvb_new_subset(tvb, 26, -1, -1);
>
> > There are still 5 bytes that aren't dissected
> > but that shouldn't matter as long as I create a
> new
> > tvb with the right length
>
> That's the problem - you probably weren't doing
> that.
>
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