   sending stuff to an IP address
  are there any simple tools/programs that'll send stuff (messages or just bytes) to a specified IP addr?   
  ...netcat?   ;  ping.exe   ;  netcat, ettercap (I think). Telnet.   ;  i guess ill be specific.I leave my wireless router without a WEP encryption. i allow strangers to use it, mainly because i know what it's like to not have a wifi hotspot.but today somebody was on my wifi and i noticed everything slowed down to a super crawl. and i didnt appreciate them using all my bandwidth.is there anyway to send that person a message or something?like a "Please dont use all my bandwidth, thanks."thanks.   ;  The Windows Messenger perhaps (but he probabely has that blocked). Or check your logs and see if there's anything in there that leads to his identity and then send him an e-mail. I suggest you try some for of bandwidth throttler that limits how much of your bandwidth roaming guests can use.   ;  But really, you should block him out. Let him get his damn internet if he needs it so much. It's also likely your message will be blocked, as it might be considered an attack.start->run->services->menu->all tasks->send console message?start->run->cmd->net send 192.168.0.2 get off me router now you leech!!!!!   ;  If you can do any kind of packet shaping, QoS, whatever with your router, I'd do that. Although I don't think many routers give you the option to do it. I'm just going for the using my own PC as a router approach as soon as I get another ethernet card - I also leave my wifi connection open.   