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Jason Swett
Asked: 2011-02-25 09:57:12 +0800 CST

DNS troubleshooting

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I'm the sysadmin at my company out of necessity. I'm not actually that knowledgeable. It's probably helpful to know that when I'm asking my question.

We have a DNS server here that I set up a few months ago. Today our internet stopped working (somebody unplugged the firewall) and after we plugged the firewall back in I restarted the DNS server. When the DNS server booted back up, the internet still didn't work, so I ran sudo named on the DNS server and the internet started working for everyone again.

However, domains on our intranet don't work anymore. I have several intranet sites on the .office domain that have never had problems and now they don't work anymore. The machines the DNS server pointed to now have different IP addresses, but I updated those IP addresses, so it seems like it should work.

I'm using Ubuntu with BIND. Given my limited experience with DNS, I don't know what to try. Any suggestions?

ubuntu domain-name-system bind

1 Answers

  1. Best Answer

    For restart:

    # service bind restart

    For debug, run named in foreground and send log to console:

    # /usr/sbin/named -u bind -g -d 1

    See log:

    less /var/log/syslog

    Check named process:

    ps aux | grep name

    Check port listen:

    lsof -i udp:53
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