I am trying to understand the relationship of the netdevice ioctl()
commands and raw packet sockets.
Does "Promiscuous" do anything when reading from a raw packet socket?
When I monitor for unique MAC addresses, I do not see any difference.
Does "Multicast" do anything when reading from a raw packet socket?
If I have not joined a multicast group, why am I getting the packets?
My original understanding was that the network traffic received by a
NIC would be filtered at the link level based on a source/Dest MAC
match and any registered link layer multicast address. UNLESS, the
interface is put into promiscuous mode. This is obviously not the case.
The goal:
I have a video player on a network which has many multicast streams.
The video player needs to monitor the network traffic for multicast
packets with custom MAC destinations BUT I do not want to see all
network multicast traffic due to CPU load considerations.
If raw packets are not filtered at the link level, how can this be done?
Thanks,
Allen
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