Re: NDv6 and xdp-filter

Topi Wala <[email protected]> writes:

> Hi,
>
> I've installed an xdp-filter (dny_all) on my tap interface (and am
> only letting through L2 packets that match my src/dst mac), and it
> still lets through NDv6 traffic. Do L2 multicast packets not get
> "received" by the xdp filter? Running tcpdump inside Qemu linux
> connected to this tap interface shows me NDv6 multicast packets from
> the ToR switch.

All packets should be received by the XDP program; but only in the
ingress direction. So what do mean "running tcpdump inside the qemu
instance"? That sounds like you're talking about packets going *out* of
the TAP interface from the host PoV? XDP won't see those (you'll have to
run the program on the physical interface).

-Toke