the filter of sniff function in scapy does not work properly

Question

It seems that the filter of sniff function does not work properly.

I m executing the sniff with the following filter

a=sniff(co         


        

Answer 1

the sniff function need tcpdump to apply "filter". If there is no tcpdump, scapy reports a warning but doesn't throw. You can enable logging to check it.

import logging
import sys
logging.getLogger("scapy").setLevel(1)
logging.basicConfig(stream=sys.stdout, level=logging.INFO)

from scapy.all import *