- I don't understand why people are so negative about IPv6. I have done essentially zero home networking work and I just ran this successfully. It just works!
```
> ping6 google.com
PING6(56=40+8+8 bytes) 2605:59c0:236f:3a08:7883:9d04:c26d:5fa1 --> 2607:f8b0:4005:806::200e
16 bytes from 2607:f8b0:4005:806::200e, icmp_seq=0 hlim=117 time=22.262 ms
16 bytes from 2607:f8b0:4005:806::200e, icmp_seq=1 hlim=117 time=26.124 ms
16 bytes from 2607:f8b0:4005:806::200e, icmp_seq=2 hlim=117 time=26.807 ms
^C
--- google.com ping6 statistics ---
3 packets transmitted, 3 packets received, 0.0% packet loss
round-trip min/avg/max/std-dev = 22.262/25.064/26.807/2.001 ms
```
- For everyone getting into the details about how all of this should work please look at RFC7084: Basic Requirements for IPv6 Customer Edge Routers
https://www.rfc-editor.org/rfc/rfc7084
It describes in detail what a home router needs to be doing to make all of this work seamlessly.
Things work so well that half the world has working IPv6 already.
Openwrt pretty much implements all of this out of the box.
If you are struggling with IPv6 I recommend reading up on where it is at today and figuring out how whatever makes your network special can be done using IPv6 with no fuss.
Personally I have moved several times changing ISPs in the process and my IPv6 setup involving multiple LANs on my home network has just continued to work. IPv6 renumbering events just work seamlessly and completely automatically.
Historically the only practical hold up to IPv6 adoption has been the ISPs not rolling it out to their customers.
by nesarkvechnep
2 subcomments
- Reading the comments, it looks like some people dismiss IPv6 just because they need to sit down and learn a couple of new things.
by rickcarlino
1 subcomments
- Imagine being able to connect two computers over the internet using sockets. WebRTC is a marvel, but I miss the whimsical days of running something on a port at home and connecting to it without thinking about NAT.
- If UTF-8 represents the triumph of a design prioritizing backwards compatibility with an existing standard (ASCII) to facilitate a transition, then IPv6 is the cautionary tale of a design which could have made the transition simpler but did not.
- Ipv6 is a theoretical benefit to the commons but as an individual it's an increase in complexity and a new abstraction for nearly the same result as your existing ipv4 network. There's just not enough incentive to invest in the switch.
- I'm surprised how few people are talking about ULAs. For any home network where you don't have a reserved global address space from your ISP, it makes sense to configure a ULA on your router and use it for all internal hosts, and the ISP assigned address is only used for Internet access.
This does not require NAT/Npt and you have the best of both worlds.
- The US doesn't have excessive IPv4 Addresses. We have a real shortage and big pain because we don't have anywhere near enough. Sure we have 40% of them all - but that has no indication of what enough is.
by flumpcakes
2 subcomments
- One of the biggest, I would assume in the current year, blockers to an IPv6 only world would be the fact that the major "cloud" vendors do not support it.
- I don’t know how you measure “metric tons of content” but I suspect in general there’s lots of US-available content on IPv4 that the countries like China and India want to access, and not much the other way around.
But that should be a perfect playground for an IPv6-only network that has gateways to the IPv4 content; eventually the home-developed content will begin to drive demand elsewhere.
- IPv4 has been "in crisis" for the entire 20 years I've worked in tech and we seem to be managing alright. Not to say things can't be better or we shouldn't try to improve. But I'll be surprised if v4 isn't still the default for most use cases in another 20 years.
- The main problem with IPv6 is that it is different from IPv4. There's SLAAC, there's no ARP and there're also some other differences. In the end, it's simpler to just not bother.
- I honestly don't understand why IPv6 is not actively deployed in 2026. Every piece of networking hardware over past decade supports IPv6 and often dual stack too. And to switch between both often takes a few clicks if DHCPv6 server is up and reachable. Absolutely transparent, free, zero performance hit. But no, so many persist at doing v4.
PS: I'm talking about MSO hardware. But client hardware should be at the same level of compatibility for years too.
- The way forward for what though? It remains to be seen if this level of infrastructure and complexity has any kind of resilience. I seriously doubt it does, looking back on history. I think it's far more likely that the post-industrial population contraction (which hasn't even really begun) as well as climate change (anthropogenic or not) will make it far more likely that this model of "everybody uses a computer" ends up in the junk bin of history. Can't say I'd be sad to see it go. Somebody who has no interest in computers shouldn't ever have to touch one.
- Someone should’ve thought about the UX of IPv6 before declaring it to be “the way”. It’s like having to learn Klingon just to setup your printer. IPvNext could sort that out… maybe it’s time to consider moving on.
- It is the only way forward, but the reason for that is not the correlation between population and IP addresses. After all, most of the use of internet today is not by people, but by bots, crawlers, AI agents, b2b and more, and that is far more than the human population, and then you have the virtual networks built over IP like VPNs, Tor and more. It is more related to privacy, bidirectional communication and protocols, security, identity and possibilities.
- The only place I have utilized an IPv6 address publicly is on my authoritative name servers only because some DNS testing tools assume it is there. It's not really needed however. My home firewall does have one but I have never used it. I can't think of a use for it. I have multiple static IPv4 addresses and they have suited me just fine for decades. I suppose I could bind a Squid SSL Bump MitM proxy to it in case a site blocks me but I would probably leave it off most of the time.
I never use them on my web, chat, voice, IRC and other servers as I personally find blocking shenanigans on IPv4 and not having to implement the same checks on IPv6 is just easier for a lazy person like me. IPv6 just feels like an after-thought bolt on to me. Clunky, not well thought out. Some privacy gotchas that can be disabled but some will not. That's just my take. I doubt anyone will have the same take.
I think IPv4 will be fine for another 100 years even if we have to re-purpose some DoD/MoD ranges given they don't use them and maybe annex some /8's from a few greedy companies. But that's a problem for Gen Delta. Gen Foxtrot can deal with repurposing some multicast ranges.
- The main complaint I have against IPv6 is the addresses are so unwieldy. When I look at them I have the same reaction as when I look at some kind of complex scientific formula comprised of operators and symbols that are unfamiliar. It also takes extra mental effort to expand the compressed zeros and interpret what I'm viewing.
Even after reading about them many times and using them in (an albeit limited) fashion, they still just don't feel human friendly. Not like the more straightforward IPv4 addresses do. (Or even like a hypothetical "IPv5" that simply prefixes one extra octet).
Whenever I bring this up I'm told something like "Don't bother memorizing IPv6 addresses. Use DNS instead."[1]
That take completely overlooks the fact that if the numbers exist, you will inevitably wind up needing to deal with them at various points along the way. Eg. Debugging logs, sniffing network traffic, ruling out if DNS is down, etc. I'm a big fan of ergonomics to make things intuitive and reduce unnccessary cognitive overhead, and the new scheme is a regression in that regard.
If anyone has tips on how they became more fluent with IPv6 I'd love to hear.
[1] https://www.networkworld.com/article/934784/mission-impossib...
by azalemeth
2 subcomments
- I am behind cgnat but have a native ipv6 /64 at home. I've got a great fibre connection (2G5) and everything "just works". I can host on ipv6 native machines and see them from anywhere in the world that has native ipv6 access.
The trouble is that 1) my employers do not have native ipv6 access; 2) neither does my mobile connection; and 3) really nor do a lot of my friends. Moreover, 4) if you browse a website from a native world-reachable ipv6 address, you're fingerprinted by it and it's overwhelmingly unique to you. So, it doesn't really work for hosting, and I don't get any direct benefits from it.
Instead I have a vps with a public ipv4 address and have a router that creates a wireguard tunnel to it. The reverse proxy works great over ipv6 and I am now in a position where I can forward ports and have direct connections -- albeit with hugely increased technical complexity. Ipv6 has many great ideas in it. If it's universally used it might just catch on...
by thomasdziedzic
4 subcomments
- IPv6 feels like we just can't admit to ourselves that it has been a failed transition. What would it take to come up with IPv7 which takes in the lessons of IPv6 and produces something better that we can all agree is worth transitioning to over IPv4.
by globular-toast
1 subcomments
- IPv6 is totally an equality issue. If a sizeable proportion of this forum had to share an IP address we would've had IPv6 done years ago.
- We've had enough address space for ages—the recurring pain is incentives at org boundaries: whoever owns the legacy peerings pays the migration tax.
- No mention of Indian ISPs just buying IPv4 addresses. Prices are even declining.
by preisschild
0 subcomment
- I love IPv6, SLAAC, mDNS, Thread, Matter and the other cool stuff in the ecosystem. I have wasted too much time setting manual DHCP static assignments. Now I just use SLAAC and mDNS with basically no manual config.
- NAT is good enough.
by leosanchez
2 subcomments
- Author if you are reading comments, rss feed entries point to example.com
- What dictates the allocation per country?
- Will IPV6 become a type in sql databases?
- Can someone pity me enough to explain how to do DNS on ipv6 while using slaac?
All I want to do is give every machine on my network a friendly hostname like storage.lan, timsPhone.lan, etc without having to run BIND (if possible), or dhcpd.
I have heard of zeroconf for ipv4, but the catch is I want this to work across several different platforms like Windows , freebsd, Linux, etc. I also don't want to use static addresses, but I feel like that's asking too much.
by everdrive
1 subcomments
- Here comes the flood of IPv6 evangelists who thinks everyone is confused about NAT and firewalls. I don't know where they get their talking points, but they descend onto these threads with their sanctimony. "Oh, you must be confused about how NAT works, allow me to educate you." It's very tiresome.
- [flagged]
- I find it fascinating how these key technologies handle upgrades and breaking changes. For example, Python eschewed breaking changes through 2.7.x but the dam has burst since 3.0 and every point release (it seems?) makes breaking changes, sometimes reversing itself (eg the whole s/u string prefix thing).
Many here will be familiar with the second system effect [1]. Usually people want to avoid making breaking changes but once they do, they can go a little nuts. My personal opinion is only major versions should make breaking changes and a lot of thought should go into making them as painless as possible.
IPv6 is fascinating for these reasons but also that it's a product of its time in two main ways:
1. It doesn't do anything about roaming because that wasn't an issue in the 1990s but it certainly is now;
2. A 64 bit address space would've basically been infinite addresses but instead they went with 128 bit addresses (rolling in ports) but then giving individual users a /64 address range. For some reason people deny it now or simply weren't aware but that too is a historical artifact because it was intended to put a 48 bit MAC address into that space but later we realized that's a huge PII and tracking issue; and
3. History has shown that upgrading network backbone hardware (in particular) is incredibly difficult through a process that's been described as "ossification", which is a nice description. Basically, network relays and routers wanted to avoid security issues and decided to discard things they didn't understand.
That's interesting because it violates Postel's Law [2], which basically says be liberal in what you accept and conservative in what you send.
But this shows up in all sorts of interesting ways, like it's practically impossible to reliably use MTUs larger than about 1536. When IPv4 was designed, that wasn't an issue. With 1-100G+ networks it is. There are RFCs about using large MTUs but you're dependent on backbone hardware you have no control over.
Even Linux struggles with this, to the point where you need to do some configuration for high-bandwidth networks (eg RPS [3]). Just handling all those interrupts presents a bunch of problems beyond the original scope. And again, it's hard to fix through no fault of Linux's.
I'm old enough to remember the talk about us running out of IPv4 addresses back in the 1990s. It's been interesting to watch how this has consistently been kicked down the street (eg cgNAT).
What is funny though is large companies (eg Facebook) actualy ran out of internal addresses on a 10/8 network and there's no good solution for that (with IPv4 at least).
[1]: https://en.wikipedia.org/wiki/Second-system_effect
[2]: https://en.wikipedia.org/wiki/Robustness_principle
[3]: https://lwn.net/Articles/362339/
- > There are countless threads online on forums like Hacker News, Reddit where people who never really got comfortable with idea of IPv6
It’s clumsier than ipv4. It’s unnecessary since NAT was invented. In practice IPv6 requires dual stack, which means twice as many firewalls, names and routes to manage — so 4x the debugging because you have 2 dimensions that can either be working or failing. Addresses are too long to remember, too clumsy to write, and after 30 years still don’t have consistent representation (how many colons and brackets?).
Look, IPv6 has some benefits, but until the usability is fixed, it will be another 30 years before it’s close to 95% adoption.
- If IPv6 was going to be successful, it would have been successful years ago. It seems, people are just more comfortable with layers of NAT than native IPv6 everywhere. I'd guess that it should have been more backwards compatible. Similar to UTF-8 and ASCII.
- If IPv6 doesn't dominate in the next, let's say, 10 years, they might publish the IPv8 which will be an 64bit space, backwards compatible with IPv4. It will be the only case where a newer version of software comes back closer to an older one.
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