sudo nmap 192.168.208.1-254
Starting Nmap 7.12 ( https://nmap.org ) at 2017-09-13 16:58 SAMT
sendto in send_ip_packet_sd: sendto(4, packet, 44, 0, 192.168.208.65, 16) => Operation not permitted
Offending packet: TCP 10.20.208.6:34958 > 192.168.208.65:443 S ttl=50 id=14568 iplen=44 seq=3905354628 win=1024 <mss 1460>
........
sudo service firewalld stop