Re: New APIs to support multiple DLT_'s on an interface

[Guy Harris <gharris () sonic net>]

On Thu, Dec 12, 2002 at 01:04:38AM -0600, David Young wrote:
> Point taken about -D. I suggest tcpdump -y for "set data link tYpe". =)

Well, I've just checked that in - tcpdump now supports "-L" and "-y".

> For the sake of a consistent interface across platforms, I prefer
> that *every* tcpdump support both -L and -y. On platforms without a
> choice of DLT, however, tcpdump should not require the DLT API from
> libpcap. Instead, it should provide a trivial implementation which lists
> one DLT for -L and which insists that -y provide that DLT, only.

The code I checked in does that.

> On platforms it is implemented, pcap_list_datalinks should always return
> at least one DLT. Also, pcap_set_datalink should permit you to set at
> least any DLT on the list, but no DLT that is not on the list.

That's in my libpcap checkin, as per my earlier mail.
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