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Forcing named 9 to use a fixed ephemeral port range

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Operating Systems AIX Forcing named 9 to use a fixed ephemeral port range
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Old 02-02-2018
Forcing named 9 to use a fixed ephemeral port range
I'll start with I'm not an AIX expert, I inherited a lot of AIX servers to maintain.

My problem is on AIX 7.1 TL4 SP4 environments. I'm running named as a DNS forwarder only to internal DNS servers.

These AIX servers have a customized UDP ephemeral port range to avoid conflicting with the primary application running on them that defaults to a portion of the typical ephemeral range.

Since configuring named, I've seen that named is ignoring the OS configured ephemeral range.

The OS restricted UDP range is: 32768 to 49999.
I've seen requests from named using source ports above 49999.

After googling, the only article I can find that references named/bind and ephemeral ports is a page from ISC related to BIND 9. There's a setting "use-v4-udp-ports { range 1024 65535; };" that forces named to use a fixed UDP range for source ports. But the IBM documentation on named doesn't cover this option.
I tried putting the setting onto named.conf on a test system but now named won't start and no errors are logged.
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LEARN ABOUT CENTOS

ldns-notify

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)