Detect users of wireless networks ?

Hi Y'all,

I am trying to help a family with their wireless network. They have connectivity issues with their respective work laptops, due to very different (and somewhat unique) security requirements.

When I turn off all security in their wireless router they all can access the web etc just fine, evem use their VPN into one of their companies.
However after a while the connection speed seems to slow down. Is it possible that someone else is using their connection? And if so, how could I find out Y/N and who it is?

Thanks
KGG

The router should list connected nodes.

Thanks Shinma,

How can I tell the "legit" connections from the others? They all read like tech abbreviations to me.
And can I set the router to refuse a specific one? (At least until I get the security set up again)

Cheers
KGG

For computer system(s),
It should list each by its' computer name.
For network printer(s),
It would depend on whoever set up its' ID.

For quick, temporary measure,
Any half decent router should provide option to deny via MAC.

Actual procedure will obviously depend on the brand and model of the router in question.

OK Thanks. I looked up their computer names and eliminated them from the listed nodes. There are two others which we cannot identify, does not look like printers.

Can I specifically block those two by name or other means?

Features differ from brand/model of routers.
Look through the manual.
If they have misplaced the manual,
And it is a half decent router, they should be able to download it from the manufacturers' website.

*Considering the amount of time that is being spent,
Tell them to quit procrastinating and properly
Enable/configure security for the router and corresponding systems.

Thanks Shinma.
You're right - I am gonna set the WPA encryption and work on their laptops to get them connected. Seems the easier and faster route after all.