Under the column "local address" of netstat:
0.0.0.0:22 means that access to port 22 is allowed from any ip addresses.
which ip addresses? ip addresses within my local network or outside my local network.
if 0.0.0.0:22 refers only to ip addresses within my local network, why I can connect to a server from my home computer which has IP address outside the local network of the server.
What does exactly 0.0.0.0:22 mean in terms of which IP addresses can connect to port 22.