Subj : Feature request: soft IPv6 force
To   : Alexandr Kruglikov
From : Andrei Dzedolik
Date : Fri Apr 20 2018 12:43 pm

Greetings, traveler ...

20 Apr 18 13:20, you wrote to me:

 AD>> binkd relies on getaddrinfo (as any other UNIX tool dealing with
 AD>> sockets) which in turn returns addresses sorted in accordance
 AD>> with RFC3484. I'm not saying you can not berak the sorting rules
 AD>> in your particular app, but at least this is not recommended. If
 AD>> you like to tune sorting order on your system, you always have
 AD>> /etc/gai.conf. For exmaple, by putting there "precedence
 AD>> ::ffff:0:0/96 100" you will prefer v4 over v6. Not sure is this
 AD>> somehting you did not know or wanted to do. If it is not, we can
 AD>> dicsuss it further to see is it really feasible to impement in
 AD>> binkd internal precedence rules or not.

 AK> 1. we talking about not only *nix.
I know binkd runs on multiple OS's, but still it relies on 'getaddrinfo' and 
its sorting rules :)
 AK> 2. i know about netsh interface ipv6 add prefixpolicy =)
 AK> 3. if possible to make the choice of IPv6-only by means of a binkd,
 AK> then why impossible to make priorities? =\
Did I say it is impossible? I proposed to discuss and find a common ground 
before proposing chnges to the code :) You are reading RU.HUSKY/RU.BINKD and 
should know our FTN community is picky on patches and if you don't want to end 
up with 'BinkD-Plus', you have to be prepared to defend your position.

As for IPv6-only and IPv4-only, this is made by choosing an address family, 
like AF_INET4, AF_INET6 or AF_INET and these are mutually exclusive. Only in 
case AF_INET is proveded to 'getaddrinfo' it will give yuo full, ordered list 
of endpoints to connect to. And mentioned RFC3484 says order should be 
respected (should, not must).

So, is this statement correct:
1. Introduce new configuration option for FTN node object to force IPv6 or IPv4 
precedence, disrespecting the OS rules for this node only;
2. Introduce new command line argument to force current IPv6 or IPv4 precedence 
for binkd process;
3. Intruduce new global configuration option to force IPv6 or IPv4 precedence;

Is this all or am I missing something?

\aID


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