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Operating Systems AIX Command last displays wrong hostname Post 302485491 by citaylor on Wednesday 5th of January 2011 10:27:45 AM
Old 01-05-2011
Have you tried reverse as well as forward DNS resolution on the names?
Some unix (I know HP-UX is one) keep both a (truncated) hostname and an IP address in the /etc/utmpx and will use one in preference to the other, and I have seen times when they dont match.
 

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utmpx(4)							   File Formats 							  utmpx(4)

NAME
utmpx, wtmpx - utmpx and wtmpx database entry formats SYNOPSIS
#include <utmpx.h> /var/adm/utmpx /var/adm/wtmpx DESCRIPTION
The utmpx and wtmpx files are extended database files that have superseded the obsolete utmp and wtmp database files. The utmpx database contains user access and accounting information for commands such as who(1), write(1), and login(1). The wtmpx database contains the history of user access and accounting information for the utmpx database. USAGE
Applications should not access these databases directly, but should use the functions described on the getutxent(3C) manual page to inter- act with the utmpx and wtmpx databases to ensure that they are maintained consistently. FILES
/var/adm/utmpx user access and adminstration information /var/adm/wtmpx history of user access and adminstrative information SEE ALSO
getutxent(3C), wait(3C), wait.h(3HEAD) SunOS 5.11 6 Mar 2008 utmpx(4)
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