Using sockstat to look at open ports in FreeBSD
If you need to know what ports are open and listening on your FreeBSD servers, you can use a few commands. Netstat -An used to me my goto command for
UDP
ICMP Limits in FreeBSD
FreeBSD limits ICMP and UDP packets that come in on an interface in order to avoid a number of DoS attacks. The Default limits are good for 100Mb/s links but