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@ -6,6 +6,7 @@
1.2. [WiFi](#wifi)
2. [FIREWALL](#firewall)
2.1. [ufw](#ufw)
2.2. [iptables](#iptables)
3. [SSH](#ssh)
3.1. [CLIENT](#client)
3.2. [SERVER](#server)
@ -76,6 +77,52 @@ You can save either example in a script to activate the Wi-Fi whenever you want.
* Allow a specific port for a specific address
`sudo ufw allow from IP_ADDRESS to any port PORT_NUMBER`
### iptables
* To flush all rules (reset to blank slate):
`iptables -F`
* To flush an specific rule:
`iptables -F <THE_RULE_TO_FLUSH>`
### BASICS
* The rules are read in the order you give them and also their flags:
_-A_: appends to previous list of rules.
_-I_: inserts to previous list of rules.
* The rules are followed according to their type which is a chain. The three types of chains are:
_INPUT_: Comes from outside the firewall (commonly from another computer).
_OUTPUT_: Comes from behind the firewall (commonly from the same computer).
_FORWARD_: Goes to a third computer.
* To select the interface (can be eth0, lo, wlan0, etc.):
`--in-interface <INTERFACE>`
* or also:
`-i <INTERFACE>`
* To make the rule match all but the requested interface add an exclamation between the interface flag and the interface name:
`-i ! <INTERFACE>`
* To select source of connection:
`-s <SOURCE_IP>`
* To select the protocol (can be tcp, udp, etc.):
`-p <PROTOCOL>`
* Port:
`--dport <PORT>`
* Match packet rules by state (can be used instead of ports):
`-m state`
* Types of state (ESTABLISHED, RELATED, etc.), more than one can be selected by using a comman with no spaces, for example:
`--state ESTABLISHED,RELATED`
* Match packet rules by IP range (can be used instead of ports):
`-m iprange`
* To choose a range set the start IP and the end IP separated by a dash:
`--src-range <FIRST_IP>-<LAST_IP>`
* The action to enforce (ACCEPT, DROP, etc.):
`-j <ACTION>`
## SSH
### CLIENT
* login to remote host