How can I listen for raw Ethernet frames addressed to a multicast MAC address (eg 77:77:77:77:77:77
) in Python?
I'm listening for raw frames like this:
s = socket.socket(socket.AF_PACKET, socket.SOCK_RAW, socket.htons(ETH_TYPE))
s.bind(("eth0", 0))
s.recv(2048)
I can see the frames arriving on eth0
using tcpdump
but the above code does not see them. I think I need to tell the kernel that I'm interested in the multicast MAC address they're sent to but don't know how.
The Ethertype field is set to a non-standard value and the frame content is not a published protocol.
I had same issue for LLDP (multicast), turns out that
ip link set eth0 allmulticast on
or
ip link set eth0 promisc on
both works for me.
EDIT: found another safe way:
ip maddress add 01:80:c2:00:00:0e dev eth0
for my case (LLDP). In which the 01:80:c2:00:00:0e
is the destination mac of LLDP packets.
See https://github.com/jjqq2013/simple-lldp-capture-python-script/blob/main/lldp.sh
for your case it should be:
ip maddress add 77:77:77:77:77:77 dev eth0
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.