prefix length problems

Archimedes S. Gaviola agaviola at
Wed Jan 31 02:02:17 UTC 2007

Are you currently using IPv6? As far as I see ::1 is the IPv6 loopback
address which should have a /128 prefixlen on your machine.
 lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
        inet6 ::1 prefixlen 128
        inet6 fe80::1%lo0 prefixlen 64 scopeid 0x5
        inet netmask 0xff000000

-----Original Message-----
From: bind-users-bounce at [mailto:bind-users-bounce at] On Behalf
Of Dana Holland
Sent: Tuesday, January 30, 2007 11:09 PM
To: bind-users at
Subject: prefix length problems

I thought I had my DNS issues corrected, but now I'm seeing a different
problem.  I'm seeing the following in my logs on the DNS server:

Jan 30 08:58:48 dns named[19714]: prefix length for ::1 is unknown (assume

There are a lot of these messages.  Email stopped going out again - this
time for all domains, not just the few I mentioned yesterday.

This is version 9.3.4 of Bind, and it's running on an AIX 5.2 box.

I can't find much on google about this error message - I did see one
reference to it happening on an AIX box, but not real information on how to
correct the problem.

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