I‘d like to know what TCP and UDP ports need to be open for the Domain Name Service (DNS) to function properly under Linux, OS X and UNIX like operating systems?
Wikipedia Explains Today’s Global Outage – Wikipedia.org is one of the busiest website on the Internet went down today due to DNS issues.
Explains round robin DNS server, and how it works under UNIX / Windows / Linux / BSD operating systems.
I see the following error in my /var/log/messages file under Linux operating systems running BIND 9 master name server:
May 25 15:43:29 ns1 named[11794]: general: info: loading configuration from ‘/etc/named.conf’
May 25 15:43:29 ns1 named[11794]: general: info: using default UDP/IPv4 port range: [1024, 65535]
May 25 15:43:29 ns1 named[11794]: general: info: using default UDP/IPv6 port range: [1024, 65535]
May 25 15:43:29 ns1 named[11794]: general: error: the working directory is not writable
May 25 15:43:29 ns1 named[11794]: general: error: zone example.org/IN/external: zone serial has gone backwards
May 25 15:43:29 ns1 named[11794]: general: info: zone example.org/IN/external: loaded serial 2008090814
May 25 15:43:29 ns1 named[11794]: notify: info: zone example.org/IN/external: sending notifies (serial 2008090814)
How do I fix this problem under BIND 9 named server?