03-13-2008
It means the forward lookup and reverse lookup don't match in the DNS. You can either get them to fix their DNS or you can add the entires into your hosts file to get them to match.
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================
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LEARN ABOUT DEBIAN
addr2name
ADDR2NAME(1) User's Manual ADDR2NAME(1)
NAME
addr2name, name2addr - perform DNS lookups from scripts
SYNOPSIS
addr2name [-46cmnr] [HOSTNAMES]
name2addr [-46cn] [HOSTNAMES]
DESCRIPTON
Write addresses or canonical hostname of specified names to the standard output. If no names are specified via the command line, they are
read from the standard input.
OPTIONS
-4 or --ipv4
Only try to perform IPv4 lookups.
-6 or --ipv6
Only try to perform IPv6 lookups.
-c or --config
Only lookup and print results for address families that match locally configured addresses (If the system has no IPv4 resp IPv6
address, then IPv4 resp IPv6 addresses are ignored).
-h or --help
Display some help and exit.
-m or --multiple
Normally, if a name yields multiple results, only the first one is printed. With this optional parameter, all results will be
printed on a single line, separated by spaces.
-n or --numeric
Prevent forward hostname lookup. This ensures that the input names are numeric addresses, which do not need to be looked up. Typi-
cally used along with the --reverse option to convert numerical addresses to canonical hostnames.
-r or --reverse
Perform a reverse DNS lookup (enabled implicitly with addr2name). addr2name prints numerical resolved addresses by default instead.
--version
Display program version and license and exit.
SEE ALSO
host(1), getaddrinfo(3), getnameinfo(3), resolv.conf(5)
AUTHOR
Remi Denis-Courmont <remi at remlab dot net>
$Id: addr2name.1 658 2010-10-31 20:56:30Z remi $
http://www.remlab.net/ndisc6/
addr2name $Date: 2010-10-31 22:56:30 +0200 (dim. 31 oct. 2010) $ ADDR2NAME(1)