From owner-freebsd-net@freebsd.org  Mon Nov 30 16:09:32 2015
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Date: Mon, 30 Nov 2015 17:09:28 +0100 (CET)
From: elof2@sentor.se
To: freebsd-net <freebsd-net@freebsd.org>
Subject: Re: ngrep/ixgbe bpf bug
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No one has a theory?

/Elof


On Thu, 5 Nov 2015, elof2@sentor.se wrote:

>
> Hi all!
>
> Why don't ngrep work on ix interfaces?
>
>
> It shows nice values if I sniff on other interfaces, e.g. igb0 and
> bridge0:
>
> # ngrep -d igb0 "q" ip
> I see some matching packets. Everything looks good.
>
> # netstat -B
>  Pid  Netif   Flags      Recv      Drop     Match Sblen Hblen Command
> 1800   igb0 p--s---       135         0       129   380     0 ngrep
> The BPF stats show Recv and Match values. Good.
>
>
> # ngrep -d bridge0 "q" ip
>  I see some matching packets. Good.
>
> # netstat -B
>  Pid  Netif      Flags    Recv     Drop     Match  Sblen Hblen Command
> 1901  bridge0  p--s---  661897        0    659170 425606     0 ngrep
> Again, the BPF stats show Recv and Match values. Good.
>
>
>
> However, if I sniff on an ix interface:
>
> # ngrep -d ix1 "q" ip
> I get no matching packets!
>
> # netstat -B
>  Pid  Netif   Flags      Recv      Drop     Match Sblen Hblen Command
> 1816    ix1 p--s---     45340         0         0     0     0 ngrep
>                                                ^^^
> ...and the BPF stats always show zero Matches.
>
>
> Bug in the ixgbe driver or in ngrep?
>
> /Elof
>
>
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