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I’m not talking about SIP, I’m talking about a hypothetical piece of software that an IPv6 proponent may typically claim that is made possible by unique GUA’s f

I’m not talking about SIP, I’m talking about a hypothetical piece of software that an IPv6 proponent may typically claim that is made possible by unique GUA’s for each device. My point is that the GUA alone isn’t enough to make this work, you still need: - UPnP or something like it - A place to register your address, since they change all the time even in IPv6 And if you need these two things anyway, you can do this with IPv4, with the added change that you also include the port when registering your address, which makes the “multiple phones in a network” thing work.

vel0city 2y ago
> I’m talking about a hypothetical piece of software that an IPv6 proponent may typically claim that is made possible by unique GUA’s for each device. Like, say, a SIP client? Wanting to listen on the standard SIP port? Or say two web servers that both want to listen on :443 and you don't want to have to reverse proxy them from another box. > UPnP or something like it > https://datatracker.ietf.org/doc/html/rfc6887 https://datatracker.ietf.org/doc/html/rfc6887 Port Control Protocol seems to be pretty well supported on most of the devices I own even in IPv6. And in the end I'm pretty boned if I'm on CGNAT usually. I can pretty much never get my Switch to do matchmaking with peers on IPv4 when I'm on a CGNAT network. If we were all on IPv6, it wouldn't be a problem.
- ninkendo 2y ago
  > Like, say, a SIP client? No, not like, say, a SIP client. You seem pretty intent on not reading my whole comments or something. Mind responding to what I’m saying and not just making up your own arguments? I’m saying “ipv6 alone won’t solve X”, and you’re saying “but what about Y?”
  - vel0city 2y ago
    I'm saying "but what about Y" and you're acting like Y is never a valid issue that anyone ever seems to have. So once again, how do two devices both share port 5061 on a UPnP NAT with a single public IP address? Or even worse, if they're CGNAT'd? It's a simple answer with IPv6...
    - ninkendo 2y ago
      Again with the not reading. Let me try to sum up my position so we can end this whole “nuh uh!” nonsense. IPv6 was designed in a world where we thought we’d have a truly peer-to-peer internet where anyone could just talk to someone else’s device. This obviously isn’t what happened. An ipv6 proponent may say “this is because NAT breaks the necessary assumptions”, but that’s extremely oversimplified and wrong. The reason that, when I use my iPhone to FaceTime my mom’s iPhone, it doesn’t just use SIP to contact her phone, isn’t because IPv4 and NAT. It’s because the very idea of that is nearly impossible to implement at scale even if everyone had a unique address. I’m aware you can’t have multiple devices behind a NAT address listen on the same port. Thank you for pointing that out, you’re very smart. But it really doesn’t address my point at all, does it? My point being that the reason we don’t use SIP and related technologies for billions of end user devices today, isn’t because of NAT. It’s because the myriad of other problems that would need to be solved for it to work reliably, and because of NAT. Eliminating NAT wouldn’t really meaningfully change the landscape of how software works. FaceTime calls would still go through Apple servers. People would still use centralized services run in real data centers, etc.
      - vel0city 2y ago
        > I’m aware you can’t have multiple devices behind a NAT address listen on the same port. Thank you for pointing that out, you’re very smart. Ah, finally, you do acknowledge that there are issues that aren't actually solved with IPv4 and NAT. Thanks. > But it really doesn’t address my point at all, does it? Lets go back to the first thing I was reponding to. > it still wouldn’t let you design something like a VoIP phone (or a pure peer-to-peer version of FaceTime) that just listened for connections and let other people “call” you by connecting to your device. With having a public IP address, PMP enabled on my router, and DNS registration I have this today. My SIP phone here is sitting by, waiting for incoming calls. I don't need Apple's servers for this. Anyone with a SIP client and who knows the name can get to it (or trawls IPv6 space). This becomes a headache with IPv4 with multiple devices all wanting that 5061 port. Sure, one could just also tell people the port and have lots of random ports assigned, but that's just yet another bit of information to get lost, one more mapping to maintain, etc. Imagine if Amazon ran their ecommerce site off a random high number port instead of :443, think they'd get as much traffic?

vel0city 2y ago

> I’m talking about a hypothetical piece of software that an IPv6 proponent may typically claim that is made possible by unique GUA’s for each device. Like, say, a SIP client? Wanting to listen on the standard SIP port? Or say two web servers that both want to listen on :443 and you don't want to have to reverse proxy them from another box. > UPnP or something like it > https://datatracker.ietf.org/doc/html/rfc6887 https://datatracker.ietf.org/doc/html/rfc6887 Port Control Protocol seems to be pretty well supported on most of the devices I own even in IPv6. And in the end I'm pretty boned if I'm on CGNAT usually. I can pretty much never get my Switch to do matchmaking with peers on IPv4 when I'm on a CGNAT network. If we were all on IPv6, it wouldn't be a problem.

ninkendo 2y ago
> Like, say, a SIP client? No, not like, say, a SIP client. You seem pretty intent on not reading my whole comments or something. Mind responding to what I’m saying and not just making up your own arguments? I’m saying “ipv6 alone won’t solve X”, and you’re saying “but what about Y?”
- vel0city 2y ago
  I'm saying "but what about Y" and you're acting like Y is never a valid issue that anyone ever seems to have. So once again, how do two devices both share port 5061 on a UPnP NAT with a single public IP address? Or even worse, if they're CGNAT'd? It's a simple answer with IPv6...
  - ninkendo 2y ago
    Again with the not reading. Let me try to sum up my position so we can end this whole “nuh uh!” nonsense. IPv6 was designed in a world where we thought we’d have a truly peer-to-peer internet where anyone could just talk to someone else’s device. This obviously isn’t what happened. An ipv6 proponent may say “this is because NAT breaks the necessary assumptions”, but that’s extremely oversimplified and wrong. The reason that, when I use my iPhone to FaceTime my mom’s iPhone, it doesn’t just use SIP to contact her phone, isn’t because IPv4 and NAT. It’s because the very idea of that is nearly impossible to implement at scale even if everyone had a unique address. I’m aware you can’t have multiple devices behind a NAT address listen on the same port. Thank you for pointing that out, you’re very smart. But it really doesn’t address my point at all, does it? My point being that the reason we don’t use SIP and related technologies for billions of end user devices today, isn’t because of NAT. It’s because the myriad of other problems that would need to be solved for it to work reliably, and because of NAT. Eliminating NAT wouldn’t really meaningfully change the landscape of how software works. FaceTime calls would still go through Apple servers. People would still use centralized services run in real data centers, etc.
    - vel0city 2y ago
      > I’m aware you can’t have multiple devices behind a NAT address listen on the same port. Thank you for pointing that out, you’re very smart. Ah, finally, you do acknowledge that there are issues that aren't actually solved with IPv4 and NAT. Thanks. > But it really doesn’t address my point at all, does it? Lets go back to the first thing I was reponding to. > it still wouldn’t let you design something like a VoIP phone (or a pure peer-to-peer version of FaceTime) that just listened for connections and let other people “call” you by connecting to your device. With having a public IP address, PMP enabled on my router, and DNS registration I have this today. My SIP phone here is sitting by, waiting for incoming calls. I don't need Apple's servers for this. Anyone with a SIP client and who knows the name can get to it (or trawls IPv6 space). This becomes a headache with IPv4 with multiple devices all wanting that 5061 port. Sure, one could just also tell people the port and have lots of random ports assigned, but that's just yet another bit of information to get lost, one more mapping to maintain, etc. Imagine if Amazon ran their ecommerce site off a random high number port instead of :443, think they'd get as much traffic?