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Full Discussion: iptables & port 53 (DNS)
Operating Systems Linux Red Hat iptables & port 53 (DNS) Post 302625091 by jnojr on Tuesday 17th of April 2012 09:20:00 AM
Old 04-17-2012
DNS is UDP... you need to allow the DNS server to talk back to the client on UDP 53
 

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ldns-notify(1)						      General Commands Manual						    ldns-notify(1)

NAME
ldns-notify - notify DNS servers that updates are available SYNOPSIS
ldns-notify [options] -z zone servers DESCRIPTION
ldns-notify sends a NOTIFY message to DNS servers. This tells them that an updated zone is available at the master servers. It can perform TSIG signatures and it can add a SOA serial number of the updated zone. If a server already has that serial number it will disregard the message. OPTIONS
-z zone The zone that is updated. -h Show usage and exit -v Show the version and exit -s serial Append a SOA record indicating the serial number of the updated zone. -p port Use port as destination port (default the DNS port 53) for the UDP packets. -y key:data Use the given TSIG key and base64-data to sign the NOTIFY. Uses the hmac-md5 algorithm. -d Print verbose debug information. The query that is sent and the query that is received. -r num Specify the maximum number of retries before notify gives up trying to send the UDP packet. EXIT CODE
The program exits with a 0 exit code if all servers replied an acknowledgement to the notify message, and a failure exit code otherwise. AUTHOR
Written by the ldns team as an example for ldns usage. REPORTING BUGS
Report bugs to <ldns-team@nlnetlabs.nl>. COPYRIGHT
Copyright (C) 2005 NLnet Labs. This is free software. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PUR- POSE. 9 Jan 2007 ldns-notify(1)
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