Re: two new link type request

[Guy Harris <guy () alum mit edu>]

On Dec 1, 2003, at 11:25 AM, alex medvedev wrote:

> these are physical interfaces, which you can run protocols on top of.
>
> just got email back from IBM:
>
> IBM> SP & Federation switch driver code is IBM proprietary and we
> IBM> can not release the source code/header to outside world. Can
> IBM> you still reserve 0x38 & 0x39 for us to use?

We can reserve values for them.

However, we've been assigning values above 100, as it appears that 
NetBSD was choosing values in the 50's; they (the NetBSD people) might 
now ask us for values, so it might be safe to give them 56 and 57 - but 
I don't want to encourage the IBM folks to think that DLT_ values and 
IFT_ values are the same.

The AIX developers appear to have thought so, but they were wrong, 
because that (plus having gratuituously chosen to use 
nanosecond-resolution time stamps), *WITHOUT* changing the magic 
numbers in files, means that their tcpdump can't read captures from 
other tcpdumps, and other tcpdumps can't read captures from their 
tcpdump (we could probably pick up the hack Ethereal does to cope with 
that, at the expense of not being able to read *normal* tcpdump 
captures with a file version number of 2.2).

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