+if ( my $dev = $ENV{DEV} ) {
+ my $ifconfig = `ifconfig $dev`;
+ die "can't ifconfig $dev" unless $ifconfig;
+ die "device $dev not up: ifconfig $dev\n$ifconfig" unless $ifconfig =~ m/UP/;
+ $ip = $1 if $ifconfig =~ m/inet addr:(\S+)/s;
+ $netmask = $1 if $ifconfig =~ m/Mask:(\S+)/s;
+ $bcast = $1 if $ifconfig =~ m/Bcast:(\S+)/s;
+}
+