Unknown users on, bandwidth way off

"M" <[email protected]>
Newsgroups gmane.network.wireless.seattle.general
Message-ID <[email protected]>
Hi
Newbie here.
I regularly have at least two unknown users on a non-public WLAN.
They seem to be on whenever I look at Status
(using Actiontec GT701 & its software).
Status shows their MAC address, IP address, PC Name.

- How can I best assess as well as locate and physically identify these?
- Could noticeable bandwidth be being appropriated?

LAN as well as WLAN speed is way off its rating.
Whether related or not, a set of downloads showed less than 1/10 of
nominal 256K SDSL speed.  There are usually only about 3-5 users at a
time.

- Any suggestions for how to go about this?
- Any suggestions for Open Source or freeware monitoring, diagnostic
software?

Search results for "Networking monitoring", cluster "Freeware" yielded
about 6 lists, so I'm looking for some recommendations that might help
winnow.

Plans or leads would be appreciated.
Thanks

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