LINUX_SLL2 printing update

[Francois-Xavier Le Bail via tcpdump-workers <tcpdump-workers () lists tcpdump org>]

> --- Begin Message ---
>
>
> From: Francois-Xavier Le Bail <devel.fx.lebail () orange fr>
>
> Date: Sat, 9 May 2020 06:59:12 +0200
>
> Hello,
>
> As a user, I think the current print with LINUX_SLL2 on the "any" interface is not optimal.
>
> tcpdump -nt:
> ifindex 2 (eth0) IP 192.168.1.1 > 9.9.9.9: ICMP echo request, id 1098, seq 1, length 64
> ifindex 2 (eth0) IP 9.9.9.9 > 192.168.1.1: ICMP echo reply, id 1098, seq 1, length 64
>
> tcpdump -nte:
> ifindex 2 (eth0) Out 00:50:79:ab:cd:ef ethertype IPv4 (0x0800), length 104: 192.168.1.1 > 9.9.9.9:
> ICMP echo request, id 1109, seq 1, length 64
> ifindex 2 (eth0)  In 00:50:79:12:34:56 ethertype IPv4 (0x0800), length 104: 9.9.9.9 > 192.168.1.1:
> ICMP echo reply, id 1109, seq 1, length 64
>
> For a quick look, I don't need 'ifindex N', but I need 'In/Out,...'
>
> Thus I propose to print:
> tcpdump -nt:
> eth0 Out 192.168.1.1 > 9.9.9.9: ICMP echo request, id 1109, seq 1, length 64
> eth0  In 9.9.9.9 > 192.168.1.1: ICMP echo reply, id 1109, seq 1, length 64
>
> tcpdump -nte:
> eth0 Out ifindex 2 00:50:79:ab:cd:ef ethertype IPv4 (0x0800), length 104: 192.168.1.1 > 9.9.9.9:
> ICMP echo request, id 1109, seq 1, length 64
> eth0  In ifindex 2 00:50:79:12:34:56 ethertype IPv4 (0x0800), length 104: 9.9.9.9 > 192.168.1.1:
> ICMP echo reply, id 1109, seq 1, length 64
>
> We can change because the printing is currently not supported in any release version, thus no
> usage/habit/greping really defined.
>
> -- 
> Francois-Xavier
>
> --- End Message ---
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