While it might not be obvious how to assign a iprange as an Allow (or Deny) entry in IIS, it is simple to do.
Simply enter the prefix instead of the netmask in the field for “Mask or Prefix”
Example of how to allow the 16 bit local ip block 192.168.0.0 – 192.168.255.255
Result:
netstat can be used to figure out what program is using a port.
$ netstat -nlp Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1096/sshd tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 1733/apache2 tcp6 0 0 :::22 :::* LISTEN 1096/sshd Active UNIX domain sockets (only servers) Proto RefCnt Flags Type State I-Node PID/Program name Path unix 2 [ ACC ] STREAM LISTENING 6338 1071/gdm-simple-sla @/tmp/gdm-greeter-LvjLQPzT unix 2 [ ACC ] STREAM LISTENING 5165 1072/X /tmp/.X11-unix/X0 |
If you have a lot open then grep can be used to only find what you are looking for
netstat -nlp|grep :22 tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1096/sshd tcp6 0 0 :::22 :::* LISTEN 1096/sshd |
For windows, simply start with
netstat -n |