[dopylitty]

I've been listening to a very good IPv6 related podcast with knowledgeable hosts (IPv6 Buzz) and all it's done is convince me that IPv6 is a poorly thought out mistake.

Every other episode seems to be about a different new RFC that's replacing another RFC because the original ended up having a bunch of holes and edge cases. That's somewhat understandable for a new protocol but the protocol have been around for almost 30 years and is just so overly complex that it's rife with these situations.

As an example the most recent such episode was on rfc6724[0] which describes these convoluted algorithms systems are supposed to follow to determine which of their many assigned IPv6 addresses to use for a particular connection and also which of many possible destination addresses to use. Just reading the introduction makes your eyes water with how overly complex and prone to nasty failure cases (what if the source address isn't what you expect and somehow the connection routes around your firewall?) the whole situation they've created is.

0: https://datatracker.ietf.org/doc/html/rfc6724

[noAnswer]

This somehow reminds me of some anti EV (Electric Vehicle) people. They accept ICEVs (Internal Combustion Engine Vehicle) as given and normal (ICEVs just exist, the fuel falls from the sky) but dig really deep into an anti EV mindset. They follow anti EV blogs and podcasts. They will tell you how bad EVs are for the environment, how mutch water and cobalt and what not is used for the production without acknowledging that the same is true for ICEVs.

I use IPv6 since 2006 and I just can't see how it can give you "a massive headache". I read a blog post about how overly complex HTTP/3 is. Better ignore it forever and never implement it then. ;-) Also, which successful RFC protocol doesn't have a see of follow-up RFCs?

[Qwertious]

There's a nugget of truth in anti-EV comments, namely 1) EVs are in many ways a mediocre solution (EVs will increase batteries etc needed), and 2) pursuing EVs carries an opportunity cost (public transport will reduce emissions far more than EVs and be substantially cheaper than cars as well, and a $1000 EV subsidy could instead be a free ebike).

That said, EVs are mostly better than ICEVs - "mostly" because performance-heavy applications like long-haul trucking and tractors still benefit heavily from fossil fuels, and in most other applications EVs are still more expensive than ICEVs.

[Spivak]

Yes, but in this case ipv4 source selection is simple.

* if the app specifies a source use that.

* do a route lookup, if the route has a src use that

* if you get no hint, use the first address.