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On Feb 24, 2020, at 6:15 AM, Ray Bellis via tcpdump-workers
<tcpdump-workers@lists.tcpdump.org> wrote:
> I've got a daemon that listens on a virtual IP address, that is itself
> attached to a cloned loopback interface on FreeBSD.
What do you mean by "loopback" here? The term "loopback interface" generally
means "fake interface that sends packets from the machine to itself" on UN*Xes,
e.g. the lo0 interface on most UN*Xes or just lo on Linux. Is that the type of
interface on which you're capturing?
If so...
> Packets for that daemon could be arriving from multiple physical
> interfaces, and that's what's taxing me just now.
>
> I would -really- like to be able to process those packets without
> needing a per-interface thread or process (or other code changes) but it
> seems FreeBSD (and Linux FWIW) will only capture packets on that
> loopback IP that also -originated- on the loopback.
...why would packets be delivered on the loopback interface if they arrived on
a physical interface?
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