How to disconnect a client

jcvasquez · 02-02-2012, 08:25 AM

In a nutshell: how can I disconnect a client that connects to my network using dhcp?

I can pinpoint the lease/IP the client gets via dhcpd and with it, the MAC address. Using this information only, how can I disconnect the client from my network? (just disconnect, not banish forever)

acid_kewpie · 02-02-2012, 08:32 AM

what does "disconnect" mean? Ideally you'd connect to the switch they are connected to an shut down that port. You can put out fake arps for their IP address so they can't do much, but outside of a physical sense, there really is no such thing as disconnecting them. They aren't connected to the network in any way other than physically. It's not like there is a connection to a service like AD which makes their world pretty limited if domain membership was revoked.

tommylovell · 02-02-2012, 10:45 AM

I agree with Chris.

I think the only reliable way to prevent someone from accessing your network is to implement IEEE 802.1x. That would be an awful amount of work and expense. Every other measure you take could be subverted.

I assume (because of the DHCP reference) that the client is somewhere within your premises? I'd have security escort them from the building.

acid_kewpie · 02-02-2012, 10:50 AM

Everytime I hear someone say they are "logged on to the network" I want to strangle them. 802.1x notwithstanding.