require "pcaplet"

HOST_IP = Pcap::IPAddress.new("10.0.0.1")

received_bytes = 0
sent_bytes = 0

sniffer = Pcap::Pcaplet.new("-i eth1")
sniffer.each_packet do |pkt|
  next unless pkt.ip?

  src, dst, = pkt.ip_src, pkt.ip_dst

  if src == HOST_IP
    sent_bytes += pkt.size
  elsif dst == HOST_IP
    received_bytes += pkt.size
  end
end
sniffer.close

puts "#{HOST_IP} hat #{sent_bytes} Bytes gesandt und #{received_bytes} empfangen."