Network

settings

set static ip address

• sudo nano /etc/network/interfaces:

auto ens18
iface ens18 inet static
  address 192.168.0.2
  netmask 255.255.255.0
  gateway 192.168.0.1
  dns-nameservers 89.207.128.252 89.207.130.252

• sudo reboot

check local network settings

linux commands

• ifconfig -a
  • alias nmcli dev list iface eth0 | grep IP4
• ip a hints

restart network

• sudo systemctl restart NetworkManager.service
• sudo nmcli networking off and sudo nmcli networking on
• nmtui a terminal user interface
• sudo ifdown -a && sudo ifup -a

dnsmasq

• wildcard usbdomains: https://saturncloud.io/blog/wildcard-subdomains-with-dnsmasq-a-guide-for-software-engineers/

network analyse

https://armann-systems.com/wiki/netzwerkdiagnose-tools-unter-linux-ein-umfassender-leitfaden/

check open ports

ss -ltup

netstat

• install with sudo apt install net-tools

• show all active tcp connections: netstat -tn

• scan all ports of ip: nmap -p 1-65535 192.168.1.1

• check a specific port on the system (and get infos about process):

  sudo netstat -nlp | grep PORT_NUMBER
  ps -Flww -p THE_PID
  

nmap

missing

proxy settings

global settings in /etc/environment

http_proxy=http://www-zproxy.myproxy.com:80/
https_proxy=http://www-zproxy.myproxy.com:80/
ftp_proxy=ftp://www-zproxy.myproxy.com:80/
no_proxy=localhost,myproxy.com,.myproxy.com,10.0.0.0/8,127.0.0.1
soap_use_proxy=on