Update NETWORKING.md

NETWORKING.md

@@ -30,3 +30,90 @@ dhclient <DEVICE_NAME>
 You can save either example in a script to activate the Wi-Fi whenever you want.  
 
 * Note: As an educational tip, the name of a network is also called "_SSID_" in other places.
+
+## Next
+
+### using ufw
+sudo ufw status
+sudo ufw enable
+sudo ufw disable
+sudo ufw default deny
+sudo ufw default allow
+sudo ufw allow PORT_NUMBER
+* delete a rule
+sudo ufw delete allow PORT_NUMBER
+* allow everything for a specific address
+sudo ufw allow from IP_ADDRESS
+* allow a specific port for a specific address
+sudo ufw allow from IP_ADDRESS to any port PORT_NUMBER
+
+### tcpdump
+* dump all
+sudo tcpdump
+* dump 5 packets
+sudo tcpdump -c 5
+* dump in ASCii format
+sudo tcpdump -A
+* dump in hexadecimal format
+sudo tcpdump -xx
+* dump from an specific interface
+sudo tcpdump -i INTERFACE_NAME
+* dump from a specific port
+sudo tcpdump port PORT_NUMBER
+* dump 5 packets in hexadecimal from an specific interface and a specific port
+sudo tcpdump -c 5 -xx -i INTERFACE port PORT_NUMBER
+
+### netstat
+* show routing table, including gateway
+netstat -nr
+* show all ports
+netstat -tulpn
+* show network usage of devices
+netstat -i
+* show active connections
+netstat -ta
+* show active connections, but show ip addresses instead
+netstat -tan
+
+### traceroute
+* show which route your connection takes between your computer to the destination
+traceroute WEBNAME_OR_IP
+
+### nmap
+* scan a specific ip address (including devices)
+nmap IP_NUMBER
+* scan a specific website
+nmap WEBSITE_NAME
+* scan a specific ip address (including devices) with more information 
+nmap -v IP_NUMBER
+* scan two ip address (including devices), 192.168.0.1 and 192.168.0.54
+nmap 192.168.0.1,54
+* scan a range of ip address (including devices), from 192.168.0.1 to 192.168.0.100
+nmap 192.168.0.1-100
+* scan all ip address (including devices) from network 192.168.0.0
+nmap 192.168.0.*
+* scan address from a file
+nmap -il FILE
+* scan address and identify OS and running services
+nmap -A IP_NUMBER
+* check if target is up
+nmap -sP IP_NUMBER
+* check reason for services states
+nmap --reason IP_NUMBER
+* show host interfaces
+nmap --iflist IP_NUMBER
+
+### SSH
+* login to remote host
+ssh ADDRESS
+* login to remote host as user USER
+ssh USER@ADDRESS
+* set ssh server configuration in /etc/ssh/sshd_config
+Port 22 # default port
+PermitRootLogin without-password # change "without-password" to "no"
+AllowUsers USER_NAME # by allowing a specific user it restricts the others
+* restart "ssh" service to activate changes
+
+
+# use last 8 octets for hosts
+255.255.255.0