From: Mike N. 

On Mon, 4 Apr 2005 23:33:37 -0400, "Geo"  wrote:

>But I do have a question, if using bridged mode, aren't they all
>basically on the same ethernet segment so they see each other's broadcast
>traffic? In other words if it's a bunch of windows boxes with no firewalls
>couldn't they browse to each other?

  There is an older style bridged configuration that is pure bridged mode
(IRB)  that works as you describe above.  It is appropriate only when the
ISP installs, configures, and controls both the modem and a
router/firewall.

  Nearly everyone now uses RBE in which every circuit is a separate network
and they receive only the traffic that gets routed to them and broadcasts
are suppressed.   A malicious user can guess a neighboring IP address and
send packets using that IP.   However he cannot receive any replies because
replies will go to the rightful owner.   (I don't think there is a Source
Address Assurance filter per circuit with RBE).   A DSL aggregator router
may have SAA though.

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