Re: Do MAC addresses go to internet?

On Oct 21, 8:01 pm, goarilla <"kevin DOT paulus AT skynet DOT be">
wrote:
Unruh wrote:
goarilla <"kevin DOT paulus AT skynet DOT be"> writes:

Keith Keller wrote:
On 2007-10-21, Unruh <unruh-s...@xxxxxxxxxxxxxx> wrote:
Keith Keller <kkeller-use...@xxxxxxxxxxxxxxxxxxxxxxxxxx> writes:

Depending on their and your network architecture, they may or may not
know your MACs.
MACs are only known on the subnet on which theirIP address is. Ie, it is
only for computers DIRECTLY connected to each other via ethernet.
That's right. So, hypothetically, one could imagine being on a cable
network over a hub, where your MACs would be available not only to the
ISP but to your entire network segment. (I think this scenario is
unlikely, but technically it's not impossible. The much more realistic
case is what's already been outlined.)

--keith

some questions:

isn't this exactly how cable works eg everyone on the subnet can sniff

What is "cable"? IF you are one segment, one subnet of an ethernet, all
connected together on that ethernet with the same network AND netmask, then
all can see all. However, that is almost never the case of an isp. The isp
is insulated from your system by a modem and that modem isolates your
network.

huh all can see all ? what if you're on a switch ?
but okay that's not the point
here in belgium we have 2 broadband choices:

1) xDSL (belgacom + resellers)
2) cable (telenet)

cable is like cable tv
one line in the ground were people with subscriptions and modems get
attached to
i think it's arranged in a bus like fashion but i'm not sure since i
have no real clue how it works.
disadvantage of cable is 1 global LIMIT per cable in which every
customer is limited by.
this means if a lot of people are downloading the max download speed
available to you can
be only a fraction of the line's limit.

I'm asking this simply because although i have a decent understanding of
my own LAN
network i would like to know more about bigger networks like the ones
ISP's administer.

traffic and collect valid MAC and IP adresses ?
or does cable normally don't use ethernet (and thus no MAC addresses)
as its data link layer protocol ?

The ISP networks are not much diffrent than local lans, Just bigger
and probably more interface types. As you can take your IPS's
connection and theoredicly sell it to your friends or nabours as I do.
It' comes in and I route it three ways 1 for me, 1 for servers 3, for
roomates/nabours. and beleave it or not this is all run by a P2 @300
MHz

.

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