Net Send

This is a discussion on Net Send within the Tech Board forums, part of the Community Boards category; Some of you may have gotten a pop-up windows box before with a message about airlines, diplomas, etc. I'm pretty ...

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    RoD
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    Net Send

    Some of you may have gotten a pop-up windows box before with a message about airlines, diplomas, etc. I'm pretty sure these spam advertisements are sent with the net send command :

    net send <ip> <message>

    We've used this in school, at lan parties, etc. My question is how do i disable this command for anyone not on my workgroup? I don't want to use a firewall if i can avoid it. Also, how can i password protect/restrict port 139 access to anyone now in my workgroup?

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    I know that, It won't work on our network though. We have
    a big fat FireWall blocking the place

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    RoD
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    is a firewall the only way?

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    No idea, Haven't found an option to turn it off somewhere though.

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    RoD
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    hmm i've always used zonealarm but it #####es about everything i do lol.

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    >how can i password protect/restrict port 139 access to anyone now in my workgroup?
    Once upon a time I had some VB code that would "kill" any particular TCP/IP connection you wished. I was planning to make a prog to monitor all 139 activity, and simply kill any from IPs I didn't have in my guest list. But I never got round to finishing it. Just a thought...
    When all else fails, read the instructions.
    If you're posting code, use code tags: [code] /* insert code here */ [/code]

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    Seven years? civix's Avatar
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    Hehe.. just tried the net send thing..
    Very interesting, and It has inspired me to set up a big network
    Also very easy to get people with static IP's in trouble.
    Can you say "infinite loop and system call"? Hehe

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    lol @ civix....i had mod'd a automatic net-send proggy (LAN message 1.0) to loop once, sent my buddy an inf amount of "Porn detected! Format format!" messages till his comp dumped.

    I member there are ways to do this without windows...

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    Originally posted by civix

    Can you say "infinite loop and system call"? Hehe
    Can you say "A big kick to the ban list of my router"?

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    I have the same thing just net send the bastards back

    And well, im going to setup a router which should block this kind of spam.

    Oh yeah, what noticed me is that the moment I installed msn, I got these anoying net sends...makes you wonder ay?

    {XR3D403}

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    This command will stop the messenger service on your pc, this will also avoid that you receive any messages:
    c:\>net stop messenger

    If you want to stop the messenger service remotely, check out this VBS script with WMI functionality:
    http://rattlesnake.at.box.sk/newsread.php?newsid=116

    If you know how to use VBS, it should be no problem to modify it appropriately if you want to disable a service on different remote computers on your LAN. The service name of the messenger service is "MESSENGER". I am not sure if this will work with computers not on your workgroup.

    To block netbios, you should get a firewall like Zone Alarm Pro since I would not advise you to go for a portblocker. However, the netbios service is used for many functions on your network, not only for the messenger service. So I am not sure if this would actually be a good idea.

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    I'm pretty sure that netsend actually runs on netbeui which is a local protocol. So therefor, noone outside of your network could actually do anything with netsend. I don't believe netbeui will work past the router.

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    Originally posted by hostensteffa
    I'm pretty sure that netsend actually runs on netbeui which is a local protocol. So therefor, noone outside of your network could actually do anything with netsend. I don't believe netbeui will work past the router.
    I don't use a router, but thats actually incorrect. If its enabled and u have the ip, you can do it.

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    Its not rocket science vasanth's Avatar
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    Originally posted by RoD
    I don't use a router, but thats actually incorrect. If its enabled and u have the ip, you can do it.
    well netbeui is a non routable protocol that is it cannot travel across routers and networks.. Only routable protocols such as TCP IP etc can do it..

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    i don't think that its a part of netbui, pm me sometime when you are on, i will give u my ip address and i can show you.

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