Undefined subroutine &Sys::IP::SUPPORTED called at /usr/lib/perl5/site_perl/5.6.0/Sys/IP.pm line 27. BEGIN failed--compilation aborted at /usr/lib/perl5/site_perl/5.6.0/Sys/IP.pm line 28. Compilation failed in require at ./getip.pl line 5. BEGIN failed--compilation aborted at ./getip.pl line 5.

I think the BEGIN block doesn't like looking for a sub not included in the block. So, I tested my theory with the following adjustment:

#---------------------------------------------------------------------
+-------#
#we want to die if a system isn't explicitly supported
BEGIN {
  #these are the os's that are supported at this time
  my @Supported  = (
      'openbsd', 
      'freebsd', 
      'linux', 
      'irix', 
      'solaris', 
      'darwin', 
      'MSWin32'
     );

  grep /$^O/, @Supported 
    or die "$^O isn't supported by Sys:IP yet.\n";
}
[download]

I've been up all night, so this could be made better, but it works. Here is my test code:

#!/usr/bin/perl -w
#-*-perl-*-

use strict;
use Sys::IP;
use diagnostics;

my $ip = ip();
my @ips = ips();

print $ip , "\n";

foreach ( @ips ) {
  print $_ , "\n";
}
[download]

BTW, MSWin32 uses 'ipconfig /all' for the type of data you need. I think it sits in %SystemRoot%/system32 on NT/2k and %SystemRoot%/command on 98/ME, but I could be wrong. By default, if networking is installed, ipconfig should reside in the PATH env var. I'll check it for you when I get in to work.

HTH
Dex