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Thread: Network Gurus, help please. one way Ethernet.

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  1. #1 Default Network Gurus, help please. one way Ethernet. 
    so bear with me, i'm not a network or software guy at all. I'm trying to figure out if this is possible. I have two machines, one is broadcasting messages over Ethernet, and the other is listening. the machines are connected via a switch. I want to guarantee that nothing is sent from the listening machine. Is it possible to make this setup work, specifically if you have modified the Ethernet cable on the listening machine such that the transmit lines are cut.

    now i know that traditional Ethernet communication requires a handshake from both sides, so cutting the transmit lines renders this impossible. I have done a little reading on the UDP protocol, which seems like it should work for this. Am i crazy? can this work?

    any help appreciated.
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  2. #2 Default  
    sounds like you need a firewall.. since hardware firewalls generally cost a lot of money ... just use a software firewall to disable all network traffic going out

    an even cheaper option is to mess with the hosts file and redirect all ip addresses onto itself..
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  3. #3 Default  
    You can UDP, but just setting up a serious firewall should take care of it.
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  4. #4 Default  
    the systems don't really have the ability to run a firewall, and a hardware one is out of the question. the real question is can you get communication through an ethernet cable that has had the transmit lines cut. I know this is a long shot, and i'm not confident that it's possible.
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  5. #5 Default  
    are you running through a hub/switch or with a crossover cable? You can try to kill the tx line on a crossover cable, but i doubt it will work.

    Maybe we need more info on what you are trying to do... OS's, software, etc..
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  6. #6 Default  
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    Just a touch added...some routers have the ability to do this if I remember correctly, such as DLink.
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  7. #7 Default  
    i'm being vague on the systems for a reason. At the moment i'm just trying to understand if the theory is possible.

    right now we're running through a switch, but i'm thinking we need a router for some more advanced control. We've started messing with a few modified Ethernet cables. dangerous things happen when you ask a mechanical engineer to work on and try and understand system networking.
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  8. #8 Default  
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    no you cannot get it to work with transmit lines simply cut... or rather if you do it wont be considerd "ethernet".

    I'm going to assume this is for some sort of network intrusion detection system that is just simply going to be packet sniffing traffic.

    check out this whitepaper it might be useful/what you are looking for: http://www.sentinelsecurity.net/whit...newaycable.pdf

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  9. #9 Default  
    I've actually been using that. I know it's no longer considered ethernet when you don't have the two way communication, i just call it ethernet for the sake of keeping my terms simple. I'm really trying to do what i said, one way communication via "ethernet". I need one side to be able to spam the other and have absolutely no way for the receiving side to respond. It's proving to be beyond my grasp and ability.
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  10. #10 Default  
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    It looks like this works: http://www.stearns.org/doc/one-way-ethernet-cable.html

    Never been asked to do a one way before, but from that diagram...that seems to fit the bill?
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  11. #11 Default  
    Every solution i've seen seems to be for network sniffing. The issue here is the stuff send out to the "listening" side is being sent to a specific IP through a switch. Without the full ethernet to establish the communication, the switch has no idea it's there, and the info never makes it across. I thought about a hub, since hubs are dumb and spam all incoming to all ports, but the switch can't be replaced, so even attaching a hub to the switch gives the same issue. I think it's just impossible based on the current setup.

    hooray mechanical engineers who work as systems engineers trying to figure out networking problems.
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