# TCPDUMP command

# capture icmp
`tcpdump -ni <ITF> icmp`
* with display msg:
`tcpdump -ni <ITF> icmp -vv`

# capture PTP:
`tcpdump -ni <ITF> ether proto 0x88f7`

# capture eCPRI:
`tcpdump -ni <ITF> ether proto 0xaefe`

# netcat
`nc -zv <IP> <port>`

`nc -zv <subnet> <port-range>`