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On Mar 31, 2020, at 2:10 AM, Francois-Xavier Le Bail 
<devel.fx.leb...@orange.fr> wrote:

> On 31/03/2020 00:04, Petr Vorel wrote:
>> Hi Guy,
>> 
>>>> BTW man pages (pcap.3pcap.in, pcap_datalink.3pcap.in, pcap_loop.3pcap and
>>>> pcap_next_ex.3pcap) mention only DLT_LINUX_SLL.
>> 
>>> Fixed in commit ffb99eceefd31771a4aa89f0da5d02a3c53cfd03.
>> Thanks a lot!
>> 
>> BTW how about DLT_LINUX_SLL2 as the default? What does it block?
> 
> To avoid breaking program that cannot use SLL2, could we have an API like
> pcap_set_cooked_default_ssl2() or pcap_set_default_ssl2_on_any() and use it 
> in tcpdump?

Or have an API like pcap_set_datalink() and use it in tcpdump.

Which we already do:

        tcpdump -y LINUX_SLL -w /tmp/linux_sll_not_linux_sll2.pcap

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