====== Network Hints & Tips ======

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===== Ziggo =====
  * [[networking:ziggo:changed-ip| Changed Ziggo IP]]
===== SSL / HTTPS =====
  * [[networking:ssh-key-transfer|SSH key Transfer]]
  * [[networking:ssl-installation|SSL Installation Checking]]
  * [[networking:certificate-check|Checking a SSL Certificate]]
  * [[networking:ssl-own-ca|Own SSL CA Authority for Local HTTPS]]
===== OpenVPN =====
  * [[networking:openvpn|OpenVPN Setup & Certificates ]]
===== Other Topics =====
  * [[networking:debian-networking|Debian Networking]]
  * [[networking:nftables|nftables]]
  * [[networking:iptables|iptables]]
  * [[networking:routing|Routing]]
  * [[networking:dns | Domain Name Server (DNS)]]
  * [[networking:ipv6|IPv6]]
  * [[networking:default-gateway|Default Gateway]]
  * [[networking:transip-dns|TransIP DNS]]
===== Check ports in use =====
To check the listening ports and applications on Linux:
Run any one of the following command on Linux to see open ports:
  lsof -i -P -n | grep LISTEN
  lsof -i:22 ## see a specific port such as 22 ##
  
    
  sudo nmap -sTU -O IP-address-Here
  
  ss -tulw
  
  netstat -tulpn | grep LISTEN (depreciated, use ss)