ssh packets sniffing from my router with scapy

问题

I want to sniff ssh connection to any pc on my network. I have scapy on my router and I would like to get a sniff result whenever someone connect to any of my pc in my network using ssh. This what I did by I have no result.

#!/usr/bin/python
from scapy.all import *

def sniffSSHRequest():
    sniff(iface='eth0', filter="tcp and host 192.168.1.2 and port 22", count=1)

 sniffSSHRequest()

Note that all my pc can ping the router and they can also ping each other. The question is why don't I get a sniff.

来源：https://stackoverflow.com/questions/42141691/ssh-packets-sniffing-from-my-router-with-scapy