Module 4
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Module 4. DNS Installation. DNS Software. BIND (80+ %) www.isc.org Berkeley Internet Name Domain NSD (Name Server Daemon) www.nlnetlabs.nl/projects/nsd Authoritative DNS Only UNBOUND unbound.net Caching DNS only. DNS Software - BIND. Bind runs on: Linux BSD (Free/Open/NetBSD)

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Module 4

Module 4

DNS Installation


Dns software

DNS Software

  • BIND (80+ %)

    • www.isc.org

    • Berkeley Internet Name Domain

  • NSD (Name Server Daemon)

    • www.nlnetlabs.nl/projects/nsd

    • Authoritative DNS Only

  • UNBOUND

    • unbound.net

    • Caching DNS only


Dns software bind

DNS Software - BIND

  • Bind runs on:

    • Linux

    • BSD (Free/Open/NetBSD)

    • Windows (Server 2000, 2003, XP, Vista, 7)

    • Lots of *nix systems

  • Out-of-the-box installs on most Linux distributions and RPMs

  • BSD – Ports system

  • Windows – zipped .exe (runs as a service)

  • Daemon name is named


Bind chroot jail sandbox

BIND chroot/jail/sandbox

  • Most distributions default to chroot install

    • /var/named

    • /var/named/chroot

  • Chroot is a matter of taste but important in secure environments

  • Chroot limits all daemon access to a defined path (adds base to all paths)

  • Invoked with –t option when bind loads

  • -u named limits access to named account


Exercise

Exercise

  • Install BIND on your PC

  • Uses latest BIND9

  • Default path:

    • %systemroot%\system32\dns

    • %systemroot%\sysWOW64\dns


Bind run time

BIND – run time

  • Starting BIND

    • /etc/rc.d/init.d/named start

    • named –u named [-t /path/]

  • Stopping BIND

    • /etc/rc.d/init.d/named stop

    • ps ax |grep named, Kill PID

  • Windows Control uses:

    • Administrative tools->Services


Bind control rndc

BIND Control - rndc

  • rndc tool with bind installation

  • Allows remote access to bind

  • Default install enables rndc

    • Disable with empty controls clause

    • controls {};

  • Before use must run to set up default key:

    • rndc-confgen -a


Bind rndc commands

BIND – rndc commands

  • Flush – flush cache(s)

  • Freeze zone – stop DDNS activity

  • Thaw zone – restart DDNS activity

  • Halt – immediate stop (no restart)

  • Status – BIND status

  • Reload – reload config file and all zones (keeps cache)

  • Refresh zone – force zone transfer

  • Stop – graceful stop (no restart)


Quick quiz

Quick Quiz

  • Name 2 Open Source DNS implementations?

  • What is the name of BIND's daemon (process)?

  • What is the name of the remote control tool?

  • Did your installation work?


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