[AusNOG] NBN - GPON encryption

[Thomas Weible - FLEXOPTIX]

Hi Radek,


We are examining the inherent network design of the NBN Fibre network which utilises GPON, and we are addressing security here at our office.

Now we all know that the downstream traffic for the NBN is encrypted, but what about the upstream traffic, is this encrypted? I can’t find any references from NBNCo on the encryption of the upstream traffic – only encryption of the downstream.

Can anyone confirm if the upstream traffic is encrypted?
I can’t confirm if the upstream traffic is encrypted but in a GPON environment you only should concern about encryption of the downstream traffic:
Downstream is shared media for all subscribers connected to the splitted span (32 to 128 subscribers). Every subscriber gets all downstream traffic from the others – encryption needed. For the upstream path the media is not shared. You have a „dedicated“ upstream path from your ONU to NBNs OLT. The other subscribers don’t get your upstream traffic – only looking at the physics.

Thomas

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