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Taming the Terminal

Bart Busschots

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4 quotes

system-administration

TTT Part 23 of n — Networking Intro

  • You can use the terminal command traceroute (tracert on Windows) to see what routers a packet follows from your computer to my server as follows:
  • In the first window, we'll use the tcpdump command to print out each packet that is sent from your computer to my server as follows: sudo tcpdump -nn host 46.22.130.125

TTT Part 26 of n — DHCP

  • Finally, ipconfig can be used to show the DHCP ACK packet that was used to configure a network interface (again replacing enX with the actual interface you want to get the packet for): sudo ipconfig getpacket enX

TTT Part 27 of n — DNS

  • On most Linux and Unix OSes, DNS resolution is controlled using the configuration file /etc/resolv.conf. This file is present in OS X but is used as a way for the OS to expose the settings to scripts and command-line utilities rather than as a way of controlling DNS configuration. The file on OS X is in the identical format to the ones on Linux and Unix. You can have a look at this file with the command: