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Thread: getting lan traffic

  1. April 5th, 2007, 02:24 AM #11
    oofki
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    A lot of switches do not have a mirroring mode that makes the switch act like a hub. If this is the case ARP poisioning is the easiest way to obtain the traffic.
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  2. April 10th, 2007, 11:19 PM #12
    thehorse13
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    Quote Originally Posted by oofki
    A lot of switches do not have a mirroring mode that makes the switch act like a hub. If this is the case ARP poisioning is the easiest way to obtain the traffic.
    Actually, that is incorrect and also dangerous.

    First, if you ARP poison a network, you run the risk of taking the whole damn thing down, especially if you have an underpowered box. You could DoS your entire organization and also earn a pair of shiny bracelets that you wear on your way out the door. They don't have nice network labs in jail.

    If your device does not have a span/mirror port, use a "Y" line tap (layer 1 repeater, i.e., a mini hub) immediately upstream from the switch. You can then watch inbound/outbound connections to that subnet.

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