Which machine responds to a ping?

[jim-g]

Would you help straighten out my thinking on my LAN setup as to what device
should respond to a ping plus what IP it would be providing?

I was pinged by three machines in about 45 seconds last night in this
configuration so I'm trying to figure out what is going on. My setup is:

Motorola Cable Modem followed by a Netgear WRN2000 'n' router (firewall
setup) then two machines with only one active at the time of the incident.

Sensing some attempts to gain access to my setup, I added Comodo Firewall
(only) to the laptop in case someone was getting past the router firewall.
Last night Comodo, in a 45 second span, asked to approve, or not, a response
to pinging, then another unit with one number higher in his IP then it
changed to a third ping and it was one number higher.

Since the router has a firewall, my assumption was that the router would
respond to the ping with the WAN-IP assigned by the cable company. (router
log showed nothing regarding the incident)

If that is wrong and the router passes the ping through to my laptop, what
IP WAN or LAN is the response to the outsider?

Either my assumption is wrong or someone is really good at getting through.

What should be happening here? Thanks, Jim

 

[jim-g]

Forgot to mention this is Vista Ultimate on this system.

 

[Jack-MVP]

Hi
If you would look at the Router's log you would see constant Pinging from
the Internet on the WAN Port.
This is a normal "noise at the gate" of the Router and it is very common in
Cable Internet connection.
You have to make sure that the Router is set to discard this Pings, and they
would Not enter to your system.
Look at the Router's manual for how-to.
If it is keeping coming run this free util on each computer to find the
source of the traffic.
http://technet.microsoft.com/en-us/sysinternals/bb897437.aspx
Jack (MS, MVP-Networking)

 

[jim-g]

Thanks Jack, This has been a good re-learning experience for an old timer
who has been away from networking for a long time. Finally was able to
work back to find out the Toshiba laptop was 'calling for updates'.