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====== Ubuntu - Networking - Cheatsheet ======

^Command^Description^
|ifconfig|Display the link and address status of active interfaces.|
|ip addr show|Display the link and address status of active interfaces.|
|route -n|Display all the routing table in numerical addresses.|
|ip route show|Display all the routing table in numerical addresses.|
|arp|Display the current content of the ARP cache tables.|
|ip neigh|Display the current content of the ARP cache tables.|
|plog|Display ppp daemon log.|
|ping google.com|Check the Internet connection to "google.com".|
|whois google.com|Check who registered "google.com" in the domains database.|
|traceroute google.com|Trace the Internet connection to "google.com".|
|tracepath google.com|Trace the Internet connection to "google.com".|
|mtr google.com|Trace the Internet connection to "google.com" (repeatedly).|
|dig <nowiki>[@dns-server.com] example.com [{a|mx|any}]</nowiki>|Check DNS records of "example.com" by "dns-server.com" for a "a", "mx", or "any" record.|
|iptables -L -n|Check packet filter|
|netstat -a|Find all open ports|
|netstat -l --inet|Find listening ports.|
|netstat -ln --tcp|Find listening TCP ports (numeric).|
|dlint example.com|Check DNS zone information of "example.com".|