[AusNOG] Looks like the NBN will be a PON variant for sure...

[Nick Brown]

Narelle wrote:
>    
>
>     HFC networks are often operated as Layer 3 with customers even being
>     able to see their neighbours at Layer 2.
>
>  
> Only if you do it badly. The older stuff was all bridged and really 
> poor security wise. All the newer stuff is layer 3 and DOCSIS 
> separates people nicely via RF encoding.
>  
> You should really be able to see your neighbours, anyway. Why not use 
> LANs like they were meant to??

Because from an ISP operational perspective thats a horrible thought? 
You lose the ability to shape / count / monitor traffic, in addition to 
the increased support because Joe next door has been browsing someone 
else's $c share.