On Wed, 25 Apr 2001, Paul Lussier <[EMAIL PROTECTED]> wrote:
>
> > Additionally, Media One (and other ISPs) take steps to protect the hordes of
> >unknowing Windoze users they provide services to. They often configure their
> >routers and firewalls to drop all traffic on ports 137-139, effectively
> >disabling SMB sharing. Otherwise, all those Windows users would be sharing
> >their files with the Internet at large.
>
> Also keep in mind that you *can* in fact do an SMB scan on *your*
> segment of the M1 net and still access shares. Filtering at the port
> level requires going through a router, and everyone on your "street"
> or segment hasn't gone through a router yet :)
I believe the original statement is correct: Media One (and most other
cable modem providers) prohibit port 137-139 sniffing on a "segment".
Cable modem is different from ethernet. It does have to go to the
head-end and then back down to the neighborhood. Downstream and
Upstream are different. Media One blocks SMB ports 137-139 (or at least
2 years ago they did).
To sniff your segment you'd need specialized equipment (e.g. a hacked
up cable modem) to process all of the RF on the coax. It can be done in
principle, but I haven't heard of it happening yet.
Karl
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