Update 09.md

Clearer, esp. in light of next text - thanks u/grow_ops!

Author: snori74

09.md

@@ -13,16 +13,16 @@ First we'll look at a couple of ways of determining what ports are open on your
 * `ss` - this, "socket status", is a standard utility - replacing the older `netstat`
 * `nmap` - this "port scanner" won't normally be installed by default
 
-There are a wide range of options that can be used with *ss*, but first try: *ss -ltp*
+There are a wide range of options that can be used with *ss*, but first try: *ss -ltpn*
 
 The output lines show which ports are open on which interfaces:
 
     sudo ss -ltp
     State   Recv-Q  Send-Q   Local Address:Port     Peer Address:Port  Process
-    LISTEN  0       4096     127.0.0.53%lo:domain        0.0.0.0:*      users:(("systemd-resolve",pid=364,fd=13))
-    LISTEN  0       128            0.0.0.0:ssh           0.0.0.0:*      users:(("sshd",pid=625,fd=3))
-    LISTEN  0       128               [::]:ssh              [::]:*      users:(("sshd",pid=625,fd=4))
-    LISTEN  0       511                  *:http                *:*      users:(("apache2",pid=106630,fd=4),("apache2",pid=106629,fd=4),("apache2",pid=106627,fd=4))         
+    LISTEN  0       4096     127.0.0.53%lo:53        0.0.0.0:*      users:(("systemd-resolve",pid=364,fd=13))
+    LISTEN  0       128            0.0.0.0:22           0.0.0.0:*      users:(("sshd",pid=625,fd=3))
+    LISTEN  0       128               [::]:22              [::]:*      users:(("sshd",pid=625,fd=4))
+    LISTEN  0       511                  *:80                *:*      users:(("apache2",pid=106630,fd=4),("apache2",pid=106629,fd=4),("apache2",pid=106627,fd=4))         
 
 The network notation can be a little confusing, but the lines above show ports 80 and 22 open "to the world" on all local IP addresses - and port 53 (DNS) open only on a special local address.