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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
# 1  
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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net::dns::rr::srv5.18

Net::DNS::RR::SRV(3)					User Contributed Perl Documentation				      Net::DNS::RR::SRV(3)

NAME

       Net::DNS::RR::SRV - DNS SRV resource record

SYNOPSIS

	   use Net::DNS;
	   $rr = new Net::DNS::RR('name SRV priority weight port target');

DESCRIPTION

       Class for DNS Service (SRV) resource records.

METHODS

       The available methods are those inherited from the base class augmented by the type-specific methods defined in this package.

       Use of undocumented package features or direct access to internal data structures is discouraged and could result in program termination or
       other unpredictable behaviour.

   priority
	   $priority = $rr->priority;

       Returns the priority for this target host.

   weight
	   $weight = $rr->weight;

       Returns the weight for this target host.

   port
	   $port = $rr->port;

       Returns the port number for the service on this target host.

   target
	   $target = $rr->target;

       Returns the domain name of the target host.

COPYRIGHT

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       Portions Copyright (c)2005 Olaf Kolkman, NLnet Labs.

       Package template (c)2009,2012 O.M.Kolkman and R.W.Franks.

       All rights reserved.

       This program is free software; you may redistribute it and/or modify it under the same terms as Perl itself.

SEE ALSO

       perl, Net::DNS, Net::DNS::RR, RFC2782

perl v5.18.2							    2014-01-16						      Net::DNS::RR::SRV(3)