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Linux Networking #1

Linux Networking #1. Dr. Michael L. Collard www.sdml.info/collard www.sdml.info/collard/linux collard@cs.kent.edu. TCP/IP. Set of protocols for computer communication IP (Internet Protocol) get packets from one machine to another, best effort (OSI Layer 3) Layer 4 Protocols:

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Linux Networking #1

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  1. Linux Networking #1 Dr. Michael L. Collard www.sdml.info/collard www.sdml.info/collard/linux collard@cs.kent.edu

  2. TCP/IP • Set of protocols for computer communication • IP (Internet Protocol) • get packets from one machine to another, best effort (OSI Layer 3) • Layer 4 Protocols: • TCP (Transmission Control Protocol) – ordered and guaranteed delivery

  3. IP-Based Protocols • TCP (Transmission Control Protocol) • Connection-oriented, provides ordered and guaranteed delivery to IP, manages ports • Applications using TCP: telnet, http servers, ssh, email, etc. • UDP (User Datagram Protocol) • Adds port addressing to IP, lower overhead, no guarantees • Applications using UDP: domain name service (DNS), host configuration (DHCP) • ICMP (Internet Control Message Protocol) • diagnostic and traffic control messages • Applications using ICMP: ping, traceroute

  4. Networking Setup • /etc/services – standard ports and services • /etc/init.d/network – start, stop, restart, reload, status • /etc/rc.d – runlevel network startup and shutdown • ifconfig - configure a network interface • ifup – bring a network interface up • ifdown – bring a network interface down

  5. Networking Tools #2 • iwconfig, iwlist – wireless setup and information • netstat – network current status • ping – IP communication status • traceroute – route packets take to a given host • tcpdump – monitor packets

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