Open Router Port 53

Discussion in 'Installation/Configuration' started by LinuxPete, Nov 26, 2013.

  1. LinuxPete

    LinuxPete Member HowtoForge Supporter

    I have a Centos 6 server with Ispconfig3 and a separate Netgear router.

    Recently after a slow internet connection I noticed hundreds of queries/connect request to port 53, in the router log, from various IPs around the world.

    Since this this is had happened a couple of times, I closed port 53 on the router.

    What I'd like to know if port 53 will impact any of the other functions on the server?
  2. till

    till Super Moderator Staff Member ISPConfig Developer

    Check your named configuration if it allows recursive dns queries. If thats the case, disable dns recursion in BIND.
  3. LinuxPete

    LinuxPete Member HowtoForge Supporter

    Found it (recursion=yes) in the named.conf file.

    And I see in the named.conf file under options that it listens on port #53. I'll reopen it on the router.
    I also bounced/restarted named.

    Thank, Till
    Last edited: Nov 27, 2013

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