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Linux Network commands
This document provides an overview of various networking tools in Linux, including commands for network configuration (ifconfig, route), connectivity testing (ping, traceroute), name resolution (host, nslookup), port and protocol inspection (netstat, tcpdump), and secure remote access (SSH, PuTTY). It also covers tools for firewall management (ufw), network mapping (Nmap), raw socket programming (netcat), link status (ethtool), and more. Examples are given for common tasks like viewing routing tables, capturing packets, remotely controlling systems, and accessing services over Telnet versus SSH. A references section at the end provides additional learning resources.
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Linux Network commands
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- 6. Think about itfor a second !!!! Why single physical interface should be limited to single IP address??
- 7. ifconfig eth0 <ip>netmask 10.248.255.0 up sudo route add default gw 10.1.1.2
- 8. Test Connection.. user@computer-name:~$ pingwww.google.com PING www.l.google.com (66.102.13.106) 56(84) bytes of data.
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- 10. host:used to mapnames to IP add. $ host www.google.com www.google.com is an alias for www.l.google.com. www.l.google.com has address 66.102.13.104
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- 12. $ whois 66.102.13.103
- 13. How many hopsuntil some destination? $ traceroute www.amazoon.com
- 14. Netstat : List listeningsockets , associated port# and process. netstat -l -p -n netstat --tcp netstat --udp netstat -i netstat -s
- 15. ethtool: What driver isresponsible for certain network interface $ ethtool -i <interface> $ ethtool <interface>
- 16. finger: to contactthe necessary server and retrieve info. about user. finger Email || username
- 17. Arp - Route ListARP table (MAC-IP) $ arp Show routing information $ route -v
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- 19. FireWall.. sudo ufw enable disable
- 20. Nmap: sudo nmap 192.168.1.1-255 nmap localhost
- 21. Netcat : Thenetwork Swiss army knife $ nc -v -w1 localhost -z From-ToPort
- 22. tcpdump : apacket sniffer $ tcpdump -i eth0
- 23. $ tcpdump -wfile -i eth0 Capture packets > file $ tcpdump -tttt -r file Read sniffing data $ tcpdump -n -i eth0 Capture packets with IPs $ tcpdump -i eth0 arp packets of protocol type $ tcpdump -i eth0 port 22 from particular port
- 24. Browsers from Terminal!! lynx www.google.com lynx www.facebook.com
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- 26. Talk (MultiUser) talk wall write
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- 29. Telnet sudo apt-getinstall telnetd $ ufw allow 23 $ telnet localhost Just try to ping it.. then telnet it
- 30. SSH SecureShell, a network protocol for remote administration of Unix computers $ sudo apt-get install openssh-server $ ufw allow 22 $ nmap localhost $ ssh user@pc-name
- 31. PuTTY An open sourcetelnet and SSH Client for Windows ..
- 32. Send messages between2 Ubuntu PCs ssh <user name>@<ip address> export DISPLAY=:0.0 notify-send "Title” "message text"
- 33. References: 1.http://www.alexonlinux.com/useful-linux-networking-commands 2.http://www.alexonlinux.com/tcpdump-for-dummies 3.http://www.karakas-online.de/gnu-linux-tools-summary/network -commands.html 4.http://www.linuxplanet.com/linuxplanet/tutorials/7044/1/ 5.http://aalagha.com/blog/2008/01/22/netcat-swiss-army-knife 6.http://www.dd-wrt.com/wiki/index.php/SSH 7.http://www.slideshare.net/tmavroidis/linuxnetworkingcommands 8. http://sectools.org/ 9.http://askubuntu.com/questions/31582/send-messages-between -2-ubuntu-pcs-net-send-style 10.http://ubuntuforums.org/showthread.php?t=100198 11.http://linux.about.com/od/commands/l/blcmdl1_talk.htm 12.http://forum.codecall.net/linux-networking/index3.html