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# NETWORKING
## TOC
1. [SETUP](#setup)
1.1 [/etc/network/interfaces](#/etc/network/interfaces)
1.2. [WiFi](#wifi)
2. [FIREWALL](#firewall)
2.1. [ufw](#ufw)
3. [SSH](#ssh)
3.1. [CLIENT](#client)
3.2. [SERVER](#server)
4. [TROUBLESHOOTING](troubleshooting)
4.1. [tcpdump](#tcpdump)
4.2. [netstat](#netstat)
4.3. [traceroute](#traceroute)
4.4. [nmap](#nmap)
## SETUP
### /etc/network/interfaces
@ -39,7 +54,7 @@ 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.
## TROUBLESHOOTING
## FIREWALL
### ufw
* Show status
@ -61,6 +76,24 @@ 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`
## SSH
### CLIENT
* login to remote host
`ssh ADDRESS`
* login to remote host as user USER
`ssh USER@ADDRESS`
## SERVER
* set ssh server configuration in /etc/ssh/sshd_config
```
Port 22 # default port is 22, can be changed
PermitRootLogin without-password # change "without-password" to "no" to forbid root login
AllowUsers USER_NAME # by allowing a specific user it restricts the others
```
* restart "ssh" service to activate changes
## TROUBLESHOOTING
### tcpdump
* dump all
`sudo tcpdump`
@ -116,19 +149,3 @@ You can save either example in a script to activate the Wi-Fi whenever you want.
`nmap --reason IP_NUMBER`
* show host interfaces
`nmap --iflist IP_NUMBER`
## REMOTE CONNECTION
### SSH
* login to remote host
`ssh ADDRESS`
* login to remote host as user USER
`ssh USER@ADDRESS`
## SERVER
* set ssh server configuration in /etc/ssh/sshd_config
```
Port 22 # default port is 22, can be changed
PermitRootLogin without-password # change "without-password" to "no" to forbid root login
AllowUsers USER_NAME # by allowing a specific user it restricts the others
```
* restart "ssh" service to activate changes