Subj : Another one!
To   : Konstantin Kuzov
From : Michiel van der Vlist
Date : Tue Jan 09 2018 14:45:28

Hello Konstantin,

On Tuesday January 09 2018 11:48, you wrote to me:

 KK>>> That's fido IPv6 relay for binkp and ifcico I made just for
 KK>>> lulz.
 MvdV>> So this is an IPV6 to IPv4 gateway.

 KK> Actually, it isn't strictly IPv6 to IPv4. IPv6 to IPv6 also works.

Yes, that works too. I could reach IPv6 only node 280/5006 via
2a04:52c0:101:201:f1d0:2:280:5006

 KK> And if destination IPv4 addresses are unresponsive IPv6 addresses also
 KK> will be tried.

That does not work. If I diasble listen 0.0.0.0 on my main machine I get "connection refused" when trying to connect to it via your gateway.

 KK>  So it is potentially can be used to reach IPv6-only
 KK> nodes if direct routing isn't working for some reason.

Hmmm...

 MvdV>>  IPv6 only nodes can use this to connect to IPv4 only nodes.
 MvdV>> Wow!.

 KK> Or IPv4 only nodes could use such services to advertise IPv6
 KK> reachability when don't want to mess with IPv6 tunnels

"Messing" with a tunnel was an interesting and lerningful experience. And a tunnel is much more flexible, it not only offers BINKP and IFCICO. It can be used for ALL services.

 KK> or their retro-OS doesn't support IPv6 at all.

Dump it! ;-)

 KK> Or just want a shiny f1d0-style address but can't have one...

Minor cosmetic issue...

 KK> There are could be numerious hypotetical reasons for such services to
 KK> exist.

Perhaps...

But I think that with the coming of DS_Lite the reverse would be more useful. But harder to implement...

But then I think I'd prefer to use the services of an agent independant of Fidonet. Such as http://www.feste-ip.net/ They are still a SPOF, but most likely have no interest in acting as a SPOM.

 MvdV>> I do not know what problem this is a solution for, AFAIK there
 MvdV>> are no truly IPv6 only connections yet. Every end user on the
 MvdV>> internet still has outgoing IPv4 capability and probably will
 MvdV>> have that for a very long time to come. But this certainly is
 MvdV>> an interesting experiment. Tell us more... Write a Fidonews
 MvdV>> article...

 KK> As I have already said that experiment was just for fun.

OK. ;-)

 KK> I've tested how recent linux kernels handle thousands of address
 KK> aliases on interfaces in memory constrained environment. I hadn't
 KK> intended and still don't intent to provide such service for anyone to
 KK> use in real life. As it's prone to abuse and centralization.

Indeed. Experience unfortunately shows that in Fidonet centralisation may lead to manipulation. :-(

 KK> But as my address was noticed and mistaken as potential new IPv6 fido
 KK> member I clarified that it's not. ^_^

Good that this is cleared up.

 KK>>> There are two IPv6 prefixes:
 KK>>>  - "f1d0 style" - 2a04:52c0:101:201:f1d0::/80
 KK>>>  - "hex style" - 2a04:52c0:101:201:fed0::/80

 MvdV>> I may test that hex option later.

The hex option works.


Cheers, Michiel

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