NETGEAR is aware of a growing number of phone and online scams. To learn how to stay safe click here.
Forum Discussion
Solved
Powerline Adapters
How many pairs of XAVB1601 adapers can be installed on one home electrical circuit, where each pair is point to point link ? Why cannot be more downloaded power utility: netgear.com/app/products/mod...
Hello Schumaku,
You have been very inaccurately dealing with definitions about various layers. How encryption can be related to layer L2 ?
Data Presentation and Encryption is related always to layer L6.
Yes, I agree that all PL devices are connected to a shared media - copper electrical circuit (L0).
My intention is just to have 3 pairs of PL devices sitting on same shared media where each pair will have own unique encrypted
password. Perhaps, I will turn on as well as a support of QoS if I feel my applications will get a certain improvement with that.
Mistaken I'm afraid - PL connects to the power network L0 does create above a plain flat L1/L2 system like a plain simple network hub - not a switch! The isolation between the different networks is done on an encryption scheme on the L2 layer. Almost anything above L3 and up can pass over it.
Even if you set it up in pairs of two with each pair having the same key, they are still using the same shared media (roughly L0 and L1) - it's not VLAN technology. The more concurrent PL system are on the same wires (and in the neighborhood) and using same PLC standard the slower the system. If different standard/proprietary implementations above, the performance will break down much more, because of the different implementations don't "listen" to each other.
Not sure what your intention is - substituting three individual network cables over a shared media?
Hello Schumaku,
You have been very inaccurately dealing with definitions about various layers. How encryption can be related to layer L2 ?
Data Presentation and Encryption is related always to layer L6.
Yes, I agree that all PL devices are connected to a shared media - copper electrical circuit (L0).
My intention is just to have 3 pairs of PL devices sitting on same shared media where each pair will have own unique encrypted
password. Perhaps, I will turn on as well as a support of QoS if I feel my applications will get a certain improvement with that.
Pangear wrote:You have been very inaccurately dealing with definitions about various layers. How encryption can be related to layer L2 ?
Data Presentation and Encryption is related always to layer L6.
Boahahahahahahahaha!!!
Not everything does fit to academic definitions as what they teach you at school.
Since about 1987, we have deployed Ethernet MAC based encryption controllers in finance and government (read: defense) applications with Digital Equipment Corporation... Everything happened on the Data Link Layer ... that's L2 in the OSI model my friend. Google for Digital Ethernet Secured Network Controllers (DESNC) and VAX Key Distribution Center or read the 11th National Computer Security Conference: Proceedings, 17-20 October, 1988 , p.219 ff.
Decades later, IEEE 802.1AE was introduced. Together with IEEE 802.1X this allows the negotiation and dynamic update of keys - as used for example on business class wireless access points where each user does authenticate against the AP and every user client session does run on a dedicated key pair. Even your home WiFi with it's dead simple and shabby PSK and your Powerline devices do L2 encryption.
Everywhere Ethernet data is flowing over potentially insecure connection (satellite, p2p wireless links, fiber, copper, ...) L2 encryption is still sate of the art - look around with Thales (SafeNet/Gemalto) or Crypto International. 10GbE on full wirespeed, without adding reasonable latency, or 100 GbE using a a multiplex of these encryptors.
Another popular example is e.g. LTE - thee are bunches of different encryption levels, some with key derivation - ways below the effective IP traffic - everything happens on L1 and L2.Hi Schumaku,
Let me have the last laughter in this discussion with you. I am a retired telecommunications engineer with almost 50 years
experience in various fields of telecommunications engineering. Yes, theres is a difference among academic science in electric/electronic
engineering and the practical engineering. A production engineer strives in short time to come up with a workable system/device but scientists ( in academia ) looks for a long term perfection.
You mentioned about encryption made in layer L2. I can bring up another example where an encryption is done in layer L1 for
DWDM OTN ( optical device ). The reasons for that is to decrease overhead bits in a frame ( as you know each layer of theoretical seven layer OSI adds more overhead bits. In my opinion, this is the main reason when practical engineering neglects the theory in data communications.
Good luck