You can silence the messages by sending category cname to null, but
have you tried contact the zone administrator postmas...@concord.org
to get the delegation fixed.  One of the points of logging the
configuration error is to make it visible so it can be fixed.  The
second reason is to have evidence of why a lookup is failing.

128-25.119.138.63.in-addr.arpa. 3600 IN NS      ns5.concord.org.
128-25.119.138.63.in-addr.arpa. 3600 IN NS      ns6.concord.org.
;; Received 106 bytes from 66.155.216.121#53(ns1.paetec.net) in 409 ms

128-25.119.138.63.in-addr.arpa. 10800 IN NS     cable.concord.org.
128-25.119.138.63.in-addr.arpa. 10800 IN NS     barney.concord.org.
128-25.119.138.63.in-addr.arpa. 10800 IN NS     dns1-bos.paetec.net.
;; Received 144 bytes from 63.138.119.200#53(ns6.concord.org) in 407 ms

Alternatively complain the the parent zone (d...@paetec.net) about
the delegation being broken and request that it be fixed / removed
as it is causing operational issues as per RFC 1034.

Mark

In message 
<CAMD-=VL9YnsELw=sC-hOO=pjlv5fxls3sr6w31aabpmjmut...@mail.gmail.com>, Nick 
Edwards writes:
>  skipping nameserver 'ns5.concord.org' because it is a CNAME, while
> resolving '210.128-25.119.138.63.in-addr.arpa/PTR'
> 
> I have logs grow by about 30 megs a day with pretty much only this in
> it (of course not always same remote server), how do I shut this up ?
> 
> My logging statments are
> 
> logging {
>         category lame-servers { null; };
>         category edns-disabled { null; };
>         category client { null; };
>         category dnssec { null; };
>         //      channel log_queries { file "/tmp/debug_query.log";
> print-category yes; };
>         //      category queries { log_queries; };
> };
> 
> TIA
> _______________________________________________
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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: ma...@isc.org
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