unknown host

[rbrooks]

I my nas is coming thru as an unknown host, I was wondering if anyone knows why? It works perfectly other than this....:   Tue Sep  3 11:22:34 2002 : Auth: Login OK: [sshipley] (from nas UNKNOWN-NAS port 20213) Tue Sep  3 11:24:52 2002 : Auth: Login OK: [rgray] (from nas UNKNOWN-NAS port 20101) Tue Sep  3 11:25:12 2002 : Auth: Login OK: [johnnybeachesq] (from nas UNKNOWN-NAS port 20114) Tue Sep  3 11:29:10 20