detect when a computer joins the network

detect when a computer joins the network
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Subject Author Date
detect when a computer joins the network Matt 01-13-2007
Posted by Matt on January 13, 2007, 8:24 am
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Some of our employees bring their own laptops to work, and join the
network to connect to the internet. Is it possible to detect (and
maybe prevent) when someone connects a computer (not a member of the
domain) to the network?

Thanks,
Matt


Posted by on January 13, 2007, 11:27 am
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Check your network switch's documentation. Many Ethernet switches have
security features that block unknown computers from connecting.

J Wolfgang Goerlich

Matt wrote:
> Some of our employees bring their own laptops to work, and join the
> network to connect to the internet. Is it possible to detect (and
> maybe prevent) when someone connects a computer (not a member of the
> domain) to the network?
>
> Thanks,
> Matt


Posted by Lanwench [MVP - Exchange] on January 15, 2007, 12:50 pm
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> Some of our employees bring their own laptops to work, and join the
> network to connect to the internet. Is it possible to detect (and
> maybe prevent) when someone connects a computer (not a member of the
> domain) to the network?
>
> Thanks,
> Matt

You can prevent users from joining computers to the domain via group
policy -

Security Settings\Local Policies\User Rights Assignment\Add Workstations to
Domain

I also hope your company has a written policy stating that unauthorized
computers are not to be connected to the network at all. Don't keep unused
network jacks at the desktops/on the floor, patched into your switches in
your data/server room or closet.



Posted by Phillip Windell on January 16, 2007, 2:01 pm
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Are you asking about joining to the domain or just plugging into the network
and getting a TCP/IP config?

If it is just them connecting to the LAN, that is a discipline problem and
not a technical problem. That is stopped by company policy, not group
policy. If management won't adopt such a policy and then actually enforce
it,..then you might as well forget it and let them do what they want.

--
Phillip Windell [MCP, MVP, CCNA]
www.wandtv.com

The views expressed are my own (as annoying as they are), and not those of
my employer or anyone else associated with me.
-----------------------------------------------------

> Some of our employees bring their own laptops to work, and join the
> network to connect to the internet. Is it possible to detect (and
> maybe prevent) when someone connects a computer (not a member of the
> domain) to the network?
>
> Thanks,
> Matt
>



Posted by on January 16, 2007, 3:34 pm
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True. Still, it is always good to back up a corporate policy with a
technical one. I'd enforce it by blocking unknown MAC addresses, if the
switch allows it.

J Wolfgang Goerlich

Phillip Windell wrote:
> Are you asking about joining to the domain or just plugging into the network
> and getting a TCP/IP config?
>
> If it is just them connecting to the LAN, that is a discipline problem and
> not a technical problem. That is stopped by company policy, not group
> policy. If management won't adopt such a policy and then actually enforce
> it,..then you might as well forget it and let them do what they want.
>
> --
> Phillip Windell [MCP, MVP, CCNA]
> www.wandtv.com
>
> The views expressed are my own (as annoying as they are), and not those of
> my employer or anyone else associated with me.


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