[win2kforum] Re: Does ICS/Proxy reveal your internal MAC addresses to your ISP
- From: Matt Neimeyer <mneimeyer@xxxxxxxx>
- To: win2kforum@xxxxxxxxxxxxx
- Date: Tue, 08 May 2001 17:27:40 -0400
One thing I've always wondered... Based on the MAC address is it possible
to tell when kind of device it is? Or simply the manufacturer?
For example, can the MAC be used to differentiate between LinkSys cards and
LinkSys routers?
I could see that if they knew the numbers that range 01-01-01 to 01-01-10
might be known to be routers... Or some similar method.
Matt
>There is a TCP/IP protocol specifically for retrieving the MAC address of a
>network device (I believe it is RARP). What I would like to know is how he
>can tell based on the MAC what type of device it is, or that you are running
>anything? He should not be able to tell from the MAC address that you are
>running a proxy. The first 3 bytes are the manufacturer ID and the next
>(last) 3 bytes are the device (not device type) ID. No two devices in the
>world are originally given the same MAC address.
>
>It is probably that you are using a software solution that leaves some sort
>of signature. Check into a hardware solution which does NAT, like Linksys'
>DSL/Cable Modem router. I believe that 3Com, Netopia and NetGear all make
>similar devices. I believe they all also manufacture NICs, so that you could
>say that you gat a new NIC in your PC, if asked.
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