Linux Network commands
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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.
Linux Network commands
- 5. $ smbtree
- 6. Think about it for 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:~$ ping www.google.com PING www.l.google.com (66.102.13.106) 56(84) bytes of data.
- 9. DNS Tools..
- 10. host:used to map names 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
- 12. $ whois 66.102.13.103
- 13. How many hops until some destination? $ traceroute www.amazoon.com
- 14. Netstat : List listening sockets , associated port# and process. netstat -l -p -n netstat --tcp netstat --udp netstat -i netstat -s
- 15. ethtool: What driver is responsible for certain network interface $ ethtool -i <interface> $ ethtool <interface>
- 16. finger: to contact the necessary server and retrieve info. about user. finger Email || username
- 17. Arp - Route List ARP table (MAC-IP) $ arp Show routing information $ route -v
- 18. Security Tools
- 19. FireWall.. sudo ufw enable disable
- 20. Nmap: sudo nmap 192.168.1.1-255 nmap localhost
- 21. Netcat : The network Swiss army knife $ nc -v -w1 localhost -z From-ToPort
- 22. tcpdump : a packet sniffer $ tcpdump -i eth0
- 23. $ tcpdump -w file -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
- 26. Talk (MultiUser) talk wall write
- 27. Telnet vs SSH
- 29. Telnet sudo apt-get install telnetd $ ufw allow 23 $ telnet localhost Just try to ping it.. then telnet it
- 30. SSH Secure Shell, 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 source telnet and SSH Client for Windows ..
- 32. Send messages between 2 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