Scott Defranc scottdef

List of Linux networking tools

netstat (ss)

Displays contents of /proc/net files. It works with the Linux Network Subsystem, it will tell you what the status of ports are ie. open, closed, waiting, masquerade connections. It will also display various other things. It has many different options. Netstat (Network Statistic) command display connection info, routing table information etc. To displays routing table information use option as -r.

Sample output:

Proto Recv-Q Send-Q  Local Address          Foreign Address        (state)    
tcp4 0 0 127.0.0.1.62132 127.0.0.1.http ESTABLISHED

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	(netcat or nc or ncat)

	#Use Netcat as a Simple Web Server
	vi index.html #make a simple HTML file
	printf 'HTTP/1.1 200 OK\n\n%s' "$(cat index.html)" \| netcat -l 8888 #
	http://server_IP:8888 #access the content,serve the page, and then the netcat connection will close
	"while true; do printf 'HTTP/1.1 200 OK\n\n%s' "$(cat index.html)" \| netcat -l 8888; done" #have netcat serve the page indefinitely by wrapping the last command in an infinite loop

	netcat -z -v domain.com 1-1000 #scan all ports up to 1000