Re: DLT_ request

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

On Dec 1, 2016, at 10:34 AM, Scott Deandrea <sdeandrea () apple com> wrote:

> We’ve been working to provide developers with a software packet capture solution for USB transfers at Apple.  To that 
> end, I have implemented a solution which uses BPF and is libpcap compatible but is currently using the link type 
> DLT_USER15.

(Hopefully that hasn't shipped with any version of macOS, and is only being used internally to Apple, so that Apple 
hasn't repeated the mistake they made with DLT_USER2 and PKTAP.)

> Therefore, I’m requesting a DLT_ value for this.  Please let me know what the proper procedure is for this

We need a description of the link-layer header for the packets, and an indication of what the packet payload is - 
either a document at Apple we can link to, or something we can put into a document hosted on tcpdump.org.
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