my @VLANS, @MACS, @INTS);
      push $HASH{$MACS[$mac]}, [$VLANS[$vlan], [$INTS[$int]];
[download]

Here, I assume, you want to store all found VLANS, and MAC addresses, however, instead of pushing them as blobs do this:

In each iteration you get a new $mac, just add one to the hash value of $mac $MACS{$mac}++;

This way, you can get a list back later, like so: @ALL_MACS = sort keys %MACS

AND, you can check if that MAC address came by more than once by checking the value $MACS{$mac}

But instead of that, one trick I often do is or-ing: like so:

When found in mac.txt $MACS{$mac} |= 1;

When found in arp.txt $MACS{$mac} |= 2;

This way, when $MACS{$mac} == 3 it is in both. And it can be multiple times in either one of them, the value is still 3.

Storing your data.

# make the data a string
$value = join("|", $VLAN, $MAC, $INT);

# put them into a 1 dimentional hash (however, servers with the same m
+ac hash overwrite each other, although you can check)
if( defined $HASH{$mac} ) {
 warn "Two servers with the same $mac";
}else{
 $HASH{$mac}=$value; 
}
[download]

This way, you can iterate later over your $mac with:

for my $mac (keys %HASH){
  my $value = $HASH{$mac};
  ($VLAN, $MAC, $INT) = split("|", $value);
}
[download]

# or put them in a multi-dimensional hash.
$HASH{$mac}{$value}++;
[download]

This way, you can iterate later over your $mac with:

for my $mac (keys %HASH){
  for my $value (keys %{$HASH{$mac}}){
  }
}
[download]

Now post some example mac.txt and arp.txt so we can really help you.

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