well in the log i see the packet being dropped. but in the torch i still see this traffic. could this affect other costumers.the problem is even i blocked his mac addess in the arp i still see this upload traffic while the down traffic is 0
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Torch intercepts traffic before it is denied.
Regarding ARP, you didnt block anything. You just stopped your router from resolving his mac address. It could potentially prevent him from download although that is fairly simple to go around. He will stop uploading when you block the undesired traffic on his side of the link.