Subj : q
To   : Tommi Koivula
From : Michiel van der Vlist
Date : Sun Jan 14 2018 11:52 am

Hello Tommi,

On Thursday January 11 2018 10:46, you wrote to me:

 TB>>> Of course you have to use different ports on the same
 TB>>> network-adapter.

 MV>> Ah, that's IPv4 think. ;-)

 TK> Not really. You can define multiple ipv4 addresses for one network
 TK> adapter. Just like ipv6.

I know that it is possible, but unfortunately the "normal" situation these days 
is that IPv4 adresses are shared among all devices on the LAN by means of NAT. 
So one has to resort to using different port numbers to keep things apart.

With IPv6 the "kludge" of different port numbers is no longer needed, The 
unique IPv6 address will do. Hence me calling the use of different port numbers 
"IPv4 think".

 TB>>> If you use different network-adapters, it's also possible to use
 TB>>> the same port. Depending on differnt network-adapters, you have
 TB>>> different local ip-addresses. ;-)

 MV>> Not much good with only one WAN IPv4 address...

 TK> Bad for you. I have six of them... :D

You'r the lucky exception. Most of us have only one. And some of us may have 
none in the near future.

I am looking forward to the day that I can switch off IPv4 and get rid of all 
the kludges and work arounds that came with it.


Cheers, Michiel

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