Follow these steps to:

• ensure dns client configuration is in place and enabled;
• verify mail exchanger lookups are successful (if using DNS for mail exchanger lookups).
• To resolve error conditions, consult your DNS or Sendmail administrator for proper configuration parameters for your environment.

Is system configured as a DNS client:

Solaris 8, 9 and 10:

/etc/nsswitch.conf  “hosts:” line contains “dns” keyword
/etc/resolv.conf exists with a minimum configuration of at least 2 (3 preferred) nameserver IP addresses

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In this post, I’m just trying to travel with the server to know how it resolves a hostname using the DNS name resolution. Full Story

The idea behind running BIND in a chroot jail is to limit the amount of access any malicious individual could gain by exploiting vulnerabilities in BIND. It is for the same reason that we run BIND as a non-root user. This should be considered as a supplement to the normal security precautions (running the latest version, using access control, etc.), certainly not as a replacement for them. Full Story

Sometimes DNS generates the following error:

No default TTL set using SOA minimum instead.

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Sometime, we do see below error message from NS generates the following error:

No default TTL set using SOA minimum instead.

Understanding TTL will help us troubleshoot the issue related it. I hope below information will help you to understand about TTL

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Follow these steps to:

• ensure dns client configuration is in place and enabled;
• verify mail exchanger lookups are successful (if using DNS for mail exchanger lookups).
• To resolve error conditions, consult your DNS or Sendmail administrator for proper configuration parameters for your environment.

Full Story