# SRC DST PROTO PORT:RANGE
0.0.0.0/0	0.0.0.0/0	tcp	22
# Path MTU Discovery
0.0.0.0/0	0.0.0.0/0	icmp	3
0.0.0.0/0	0.0.0.0/0	icmp	4
# Or just all ICMP
0.0.0.0/0	0.0.0.0/0	icmp	0
