How to check computers connected?

Hello All!
I set up a wireless router at home, and it works very well. I didn't
use WEP becuase my laptop's Wireless NIC doesn't support it. Now I
want to see all the computers currently using my wireless router, is
there a way to do that?
Thanks!

SIncerely,
Ben

On 19-Feb-2007, "Benny Van" <(E-Mail Removed)> wrote:

> Hello All!
> I set up a wireless router at home, and it works very well. I didn't
> use WEP becuase my laptop's Wireless NIC doesn't support it. Now I
> want to see all the computers currently using my wireless router, is
> there a way to do that?
> Thanks!
>
> SIncerely,
> Ben

Are you certain that your wireless NIC doesn't support WEP? What is the
Make and Model and version number of your wireless NIC?

--
Just Me, D

Benny Van wrote:

> Hello All!
> I set up a wireless router at home, and it works very well. I didn't
> use WEP becuase my laptop's Wireless NIC doesn't support it. Now I
> want to see all the computers currently using my wireless router, is
> there a way to do that?
> Thanks!
>
> SIncerely,
> Ben


Use this freebie. Easy to use.

http://www.snapfiles.com/get/lanspy.html

Very good little app.

Cheers

Rob

--

"me here" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Benny Van wrote:
>
>> Hello All!
>> I set up a wireless router at home, and it works very well. I didn't
>> use WEP becuase my laptop's Wireless NIC doesn't support it. Now I
>> want to see all the computers currently using my wireless router, is
>> there a way to do that?
>> Thanks!
>>
>> SIncerely,
>> Ben
>
>
> Use this freebie. Easy to use.
>
> http://www.snapfiles.com/get/lanspy.html
>
> Very good little app.
>
> Cheers
>
> Rob
>
> --
>
Thanks - this is a cool utility, but there is a minor problem - it does not
detect my Linux boxes connected to the network.
Has anyone else noticed this?

Stuart

Stuart Miller wrote:
> "me here" <(E-Mail Removed)> wrote in message
> news:(E-Mail Removed)...
>> Benny Van wrote:
>>
>>> Hello All!
>>> I set up a wireless router at home, and it works very well. I didn't
>>> use WEP becuase my laptop's Wireless NIC doesn't support it. Now I
>>> want to see all the computers currently using my wireless router, is
>>> there a way to do that?
>>> Thanks!
>>>
>>> SIncerely,
>>> Ben
>>
>> Use this freebie. Easy to use.
>>
>> http://www.snapfiles.com/get/lanspy.html
>>
>> Very good little app.
>>
>> Cheers
>>
>> Rob
>>
>> --
>>
> Thanks - this is a cool utility, but there is a minor problem - it does not
> detect my Linux boxes connected to the network.
> Has anyone else noticed this?
>
> Stuart
>
>
Out of curiosity can you "ping" them from the machine that is running
"Lanspy". One of the family tried the program and them uninstalled it,
reason given was that it hadn't picked up one of the laptops that was
using wireless. This laptop runs ZA Pro and does not respond to being
pinged or allow sharing of any kind, before I could double check the
program and been removed and the laptop had disappeared out of the door.

"Kev" <(E-Mail Removed)> wrote in message
news:WK-dneTUwYTki0PYnZ2dnUVZ8q-(E-Mail Removed)...
> Stuart Miller wrote:
>> "me here" <(E-Mail Removed)> wrote in message
>> news:(E-Mail Removed)...
>>> Benny Van wrote:
>>>
>>>> Hello All!
>>>> I set up a wireless router at home, and it works very well. I didn't
>>>> use WEP becuase my laptop's Wireless NIC doesn't support it. Now I
>>>> want to see all the computers currently using my wireless router, is
>>>> there a way to do that?
>>>> Thanks!
>>>>
>>>> SIncerely,
>>>> Ben
>>>
>>> Use this freebie. Easy to use.
>>>
>>> http://www.snapfiles.com/get/lanspy.html
>>>
>>> Very good little app.
>>>
>>> Cheers
>>>
>>> Rob
>>>
>>> --
>>>
>> Thanks - this is a cool utility, but there is a minor problem - it does
>> not detect my Linux boxes connected to the network.
>> Has anyone else noticed this?
>>
>> Stuart
>>
>>
> Out of curiosity can you "ping" them from the machine that is running
> "Lanspy". One of the family tried the program and them uninstalled it,
> reason given was that it hadn't picked up one of the laptops that was
> using wireless. This laptop runs ZA Pro and does not respond to being
> pinged or allow sharing of any kind, before I could double check the
> program and been removed and the laptop had disappeared out of the door.

The two linux machines are configured in normal security, without local
firewall. They both run samba, for workgroup based shares, as I run both xp
and win98 on other machines here. Both are readable & writeable for shares,
one runs as my print server, and both respond properly to ping. It took a
while, bit I finally have it so that everybody can see everybode else.

Everything here lives behind a firewall/router.

My wireless laptop just died, so I have to wait until my son comes by with
his laptop to test the wireless detection.

Stuart

Stuart Miller wrote:

>> Out of curiosity can you "ping" them from the machine that is running
>> "Lanspy". One of the family tried the program and them uninstalled it,
>> reason given was that it hadn't picked up one of the laptops that was
>> using wireless. This laptop runs ZA Pro and does not respond to being
>> pinged or allow sharing of any kind, before I could double check the
>> program and been removed and the laptop had disappeared out of the door.
>
> The two linux machines are configured in normal security, without local
> firewall. They both run samba, for workgroup based shares, as I run both xp
> and win98 on other machines here. Both are readable & writeable for shares,
> one runs as my print server, and both respond properly to ping. It took a
> while, bit I finally have it so that everybody can see everybode else.
>
> Everything here lives behind a firewall/router.
>
> My wireless laptop just died, so I have to wait until my son comes by with
> his laptop to test the wireless detection.
>
> Stuart


Had a little play this morning.
Lanspy with it's default options.
Laptop1 using wireless with ZA, no sharing and no response to ICMP Echo.
Laptop2 using wireless with Windows firewall , no sharing and no
response to ICMP Echo.

Lanspy does not see either laptop.

If I allow sharing or ICMP Echo on either Laptop then Lanspy will see them.

If I change Lanspy's options to not check "Ping" then it will detect the
MAC addresses of both laptops even if they do not allow sharing or do
not respond to ping. However if the laptops are locked down it takes
forever to do a complete scan of all the checks that Lanspy can carry
out and it is best just to check for MAC addresses if you are checking
to see if anyone is piggybacking onto you network.
Shame it doesn't seem to have an option for continuous scanning.

Kev <(E-Mail Removed)> hath wroth:

>If I allow sharing or ICMP Echo on either Laptop then Lanspy will see them.

Where are you plugged in to do your sniffing? Locating a sniffer is
not a trivial exercise. In the typical home system, there is no
single place where you can see all the traffic.

If you're computah running Lanspy, Ethereal, etc is plugged into an
ethernet switch or into the switch on the back of the typical router,
then it will not see any traffic other than broadcasts and it's own
traffic. The purpose of the switch is to not pollute the rest of the
network with un-necessary traffic. If you replaced the switch with an
ethernet hub, which is essentially a repeater where all traffic going
into any port appears on the other ports, you will be able to see the
other traffic.

For sniffing internet traffic (bear with me for this diversion) you
need to add a hub (not a switch). The general arrangement is:

DSL or cable router ====== PC
modem ========== ethernet ======= and ethernet ====== Linux
hub (not switch to other ====== MAC
a switch) computers
|
|
|
\============= monitor computer
running the sniffer

With this arrangement, the monitor computer will see all internet
traffic, including intruders and attacks from the internet.

There are also products specfically available for doing sniffing.
<http://www.netoptics.com>
<http://www.networktaps.com>
<http://www.datacomsystems.com/products/taps/network-taps.asp>
You can also build your own (as I've done because I'm cheap).

If you specifically are trying to minitor just the wireless traffic,
it cannot be done in a "wireless router". That's because there's no
way to "tap" the traffic between the router section and the wireless
access point sections of the "wireless router". If you just plug into
one of the ethernet jacks on the back of the wireless router, you will
see broadcasts from various wireless attackers, but not see their
traffic.

The only place where you will see MOST of a wireless attackers traffic
is on the WAN side of the broadband link. If the wireless traffic is
mostly on the LAN side of the router, you will only see perhaps DNS
lookups from a wireless attacker. Another way is to sniff the
wireless traffic directly over the air, which gets only the wireless
traffic, and not those from the wired ethernet computers.

--
Jeff Liebermann (E-Mail Removed)
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

Jeff Liebermann wrote:
> Kev <(E-Mail Removed)> hath wroth:
>
>> If I allow sharing or ICMP Echo on either Laptop then Lanspy will see them.
>
> Where are you plugged in to do your sniffing?

The PC running Lanspy was wired into a combo modem/router, a speedtouch
variant known as a BT Home Hub( regrettably my Linksys has just died on
me). As there had been several mentions of Lanspy recently one of the
family decided to try to see if it could see all of the computers on the
network, he wasn't interested in actual traffic, and he found he could
not see one laptop. Rather than try to find out why he ditched the
program and went off with the Laptop. Out of curiosity I decided to run
some checks this morning to see why the Laptop hadn't been seen.

On Fri, 23 Feb 2007 18:45:56 +0000, Kev <(E-Mail Removed)>
wrote:

>Jeff Liebermann wrote:
>> Kev <(E-Mail Removed)> hath wroth:
>>
>>> If I allow sharing or ICMP Echo on either Laptop then Lanspy will see them.
>>
>> Where are you plugged in to do your sniffing?

>The PC running Lanspy was wired into a combo modem/router, a speedtouch
>variant known as a BT Home Hub

Ok. It may be called a "hub" but it's really a combination modem,
router, wireless?, and ethernet switch. It's the switch part that's
the problem. YOu can't see traffic on one port, that's going to/from
any of the other ports (except broadcasts). Try it by watching the
lights. Copy a big file between two of the ports and see if anything
lights up on a 3rd or 4th port in which you're plugged into. It won't
flash indicating that you cannot use the 3rd or 4th ports to monitor
the traffic on the 1st or 2nd ports. Incidentally, the wireless
access point section is just a 5th port on the ethernet switch and
acts the same as the other ports.

>( regrettably my Linksys has just died on me).

The Linksys whatever wouldn't have helped. The only way you're going
to monitor traffic with such an arrangement is by using seperate boxes
for modem, router, wireless, and ethernet switch. Even so, there's no
single point that will sniff ALL the traffic. Welcome to the
wonderful world of network monitoring. This is one reason why
router/switch based traffic monitoring protocols like SNMP, RMON,
NetFlow, etc are popular.

>As there had been several mentions of Lanspy recently one of the
>family decided to try to see if it could see all of the computers on the
>network, he wasn't interested in actual traffic, and he found he could
>not see one laptop. Rather than try to find out why he ditched the
>program and went off with the Laptop. Out of curiosity I decided to run
>some checks this morning to see why the Laptop hadn't been seen.

If the laptop is running Windoze XP, it might be that the firewall is
configured to reject just about everything. As I vaguely recall, ICMP
ping is blocked in the default configuration.
Control Panel -> Windoze Firewall -> Exceptions -> Advanced


--
# Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
# 831-336-2558 (E-Mail Removed)
# http://802.11junk.com (E-Mail Removed)
# http://www.LearnByDestroying.com AE6KS