Can't locate object method "address" via package "re0" (perhaps you fo
+rgot to load "re0"?) at interfaces.pl line 25.
[download]

#! /usr/bin/perl -w

use Data::Dumper::Simple;
use IO::Interface::Simple;
my @interfaces = IO::Interface::Simple->interfaces;
#print Dumper @interfaces;


for my $if (@interfaces) {
    next if $if =~ /usb|iwn|lo/;
    print "interface = " . $if . "\n";
    print "addr =      " . $if->address . "\n";
    print "broadcast = " . $if->broadcast ."\n";
    print "netmask =   " . $if->netmask ."\n";
    print "dstaddr =   " . $if->dstaddr . "\n";      # line 15
    print "hwaddr =    " . $if->hwaddr . "\n";          # line 16
    print "mtu =       " . $if->mtu . "\n";
    print "metric =    " . $if->metric . "\n";
    print "index =    "  . $if->index . "\n";

    print "is running\n"     if $if->is_running;
    print "is broadcast\n"   if $if->is_broadcast;
    print "is p-to-p\n"      if $if->is_pt2pt;
    print "is loopback\n"    if $if->is_loopback;
    print "is promiscuous\n" if $if->is_promiscuous;
    print "is multicast\n"   if $if->is_multicast;
    print "is notrailers\n"  if $if->is_notrailers;
    print "is noarp\n"       if $if->is_noarp;
}

and the result is like:

interface = re0
addr =      172.21.100.29
broadcast = 172.21.100.255
netmask =   255.255.255.0
Use of uninitialized value in concatenation (.) or string at int.pl li
+ne 15
dstaddr =   
hwaddr =    c8:0a:a9:93:87:25
mtu =       1500
metric =    0
index =    6
is running
is broadcast
is multicast
Your vendor has not defined IO::Interface macro IFF_NOTRAILERS at /usr
+/local/lib/perl5/site_perl/5.14.2/mach/IO/Interface/Simple.pm line 11
+7
[download]

Just check if the values are defined before printing them. I don't have a linux system so I don't know why IO::Interface (which does't compile for me on Windows/Strawberry) doesn't return a dstaddr or hwaddr.

printf "dstaddr =   %s\n", defined($if->dstaddr) ? $if->dstaddr : ''; 
+# line 15
printf "hwaddr =    %s\n", defined($if->hwaddr) ? $if->hwaddr : ''; # 
+line 16
[download]

Hmm, the script read now the interface parameters but not for the IP addresses as alias.

I will be very happy to get the media and the speed of the interface:

media: Ethernet autoselect (100baseTX <full-duplex>)