How can I make script that will for example disable interface once it reaches above specific number of Bytes ?
for example to make mangle that will count bytes and script that will monitor it and disable outgoing interface when some limit is reached.

thank you in advance

in firewall you can check for certain pattern, certain data or data received/sent by some parameters. then you only have to checkk if that firewall rule have caught the packet and do something if it has.

same way you can check on how much data have passed through interface and act on that.