[Info-vax] Rethinking DECNET ?

[Johnny Billquist]

On 2014-09-03 16:53, Dirk Munk wrote:
> Johnny Billquist wrote:
>> On 2014-09-02 20:26, Dirk Munk wrote:
>>> Johnny Billquist wrote:
>>>> On 2014-09-02 09:52, Dirk Munk wrote:
>>>>> JF Mezei wrote:
>>>>>> (so tunneling DECNET 5 over IP is not the same as having FAL be
>>>>>> native
>>>>>> on IP).
>>>>>
>>>>> It is >>not<< tunneling. Decnet 5 uses TCP+IP as transport layer
>>>>> instead
>>>>> of OSI. Decnet 5 hosts have IPv4 and/or IPv6 addresses and BIND DNS
>>>>> names, not OSI addresses in this case. In fact Decnet 5 is doing
>>>>> exactly
>>>>> what you're asking from a redesigned Decnet 4 stack, however it is
>>>>> using
>>>>> only one TCP port, port number 102.
>>>>
>>>> You know, this actually *is* tunneling. :-)
>>>> You have one DECnet stream over TCP/IP. Inside that stream goes DECnet
>>>> traffic, which might actually be several different streams that are
>>>> multiplexed on this tunnel. And DECnet have no idea how the two
>>>> endpoints connect, and how many hops might be along the way in the IP
>>>> world. It's a tunnel.
>>>
>>> And that is exactly the same as with OSI. With IP you address port 102,
>>> and with OSI you address protocol selector 20 (hex) for DNA (Decnet
>>> Phase V) traffic, and protocol selector 21 for NSP (Decnet Phase IV)
>>> traffic.
>>
>> And? It's still a tunnel.
>>
>>      Johnny
>>
> No, it is not a tunnel. There is no principle difference between Decnet
> over OSI and Decnet over IP. The transport layer is different, that's all.

DECnet over OSI? What does that mean? You say it like you are implying 
that OSI is a separate network protocol from DECnet. DECnet phase V *is* 
following the OSI model, not running atop of it.

With DECnet over IP, the transport layer is actually a whole full other 
network stack, of which DECnet is totally unaware of.

	Johnny

-- 
Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
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