Re: Inefficiency in BPF code for DLT_RAW

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

On Dec 23, 2009, at 2:01 AM, Darren Reed wrote:

> The links that support the IP tunnels are a fixed type, be
> it IPv4 or IPv6, and are reported as being DLT_RAW because
> there is no real layer 2 header present.

        ...

> In the face of modern processors, this might seem like
> micro-optimisation but I see it more as a precision error:
> it is not possible to precisely tell libpcap (and thus the
> BPF compiler) that a link only sees one protocol and
> therefore does not need to handle both protocol cases.
>
> Thoughts?

DLT_IPv4 and DLT_IPv6?
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