text: i'm trying to and fine  out who is using a ip 192.168.1.100, it's trying to access udp port 67 on my computer someone using a ip 192.168.1.100 is ways doing there best to access my system port udp 67, which i do not know what this port is. ip address 192.168.1.100 is usually reserved for a computer on a local network.  if you have a wireless network, this might be your own server.  udp port 67 is usually the. bootp (bootstrap protocol) server but is also used by a dhcp client requesting an ip address from a dhcp server (which will espond on port 68).