4 ms·

DHCP doesn't give you a globally unique IP address... If you're suggesting getting using a non-unique DHCP-assigned local IP address, I don't understand what d

by mort96 1y ago

DHCP doesn't give you a globally unique IP address... If you're suggesting getting using a non-unique DHCP-assigned local IP address, I don't understand what difference you think v6 does compared to v4.

stavros 1y ago
DHCP does give you a globally unique IP address when your ISP has allocated a prefix to your router, that's how all the Internet-connected IPv6 devices get their addresses. Where is our misunderstanding?
- mort96 1y ago
  ... For many of these systems, I don't control the user's router. I don't know how you imagine I'm supposed to create DNS records for each device when they're assigned some random IP address at some random network I don't control.
  - stavros 1y ago
    Have the device ping a central server and create randomword.centralserver.com, for example. However, if the problem is the DNS record, why has this thread been exclusively about globally routable IP addresses until now?
    - mort96 1y ago
      In https://news.ycombinator.com/item?id=45957048 https://news.ycombinator.com/item?id=45957048, addisonj suggested that the problem stems from the distinction from "local" and "global", and that with IPv6, you don't need that distinction. That quite naturally flows into the question: okay, how are these devices supposed to get global IPv6 addresses then?
      - stavros 1y ago
        Yes, with IPv6, there are are enough addresses that you don't need to use NAT. All IPv6 devices that are connected to the internet have global IPv6 addresses. I don't quite understand the question here, it seems to me that we're asking "but how could we possibly do this entirely mundane everyday thing?".
        mort96 1y ago
        Not all devices connected to the Internet have globally unique IPv6 addresses, SLAAC and often DHCPv6 makes local v6 addresses. Where's the globally unique IPv6 address supposed to be coming from?
        stavros 1y ago
        This explains it fairly well, I think: https://thisbridgeistheroot.com/blog/dhcpv6-prefix-delegation https://thisbridgeistheroot.com/blog/dhcpv6-prefix-delegatio...
        mort96 1y ago
        So you're talking about being assigned temporary globally unique addresses, if the network the device happens to be on at any given time happens to be set up in a certain way? I still don't understand how this is supposed to help.
        stavros 1y ago
        In https://news.ycombinator.com/item?id=45957048 https://news.ycombinator.com/item?id=45957048, addisonj suggested that the problem stems from the distinction from "local" and "global", and that with IPv6, you don't need that distinction. This helps because you don't have a NAT distinguishing between "local" and "global", all devices are in the global namespace. All the comments after that have been about solving an arbitrary and ill-defined problem with goalposts that keep shifting from globally unique addresses to DNS hostnames to permanent addresses.

by mort96 1y ago

stavros 1y ago

DHCP does give you a globally unique IP address when your ISP has allocated a prefix to your router, that's how all the Internet-connected IPv6 devices get their addresses. Where is our misunderstanding?

mort96 1y ago
... For many of these systems, I don't control the user's router. I don't know how you imagine I'm supposed to create DNS records for each device when they're assigned some random IP address at some random network I don't control.
- stavros 1y ago
  Have the device ping a central server and create randomword.centralserver.com, for example. However, if the problem is the DNS record, why has this thread been exclusively about globally routable IP addresses until now?
  - mort96 1y ago
    In https://news.ycombinator.com/item?id=45957048 https://news.ycombinator.com/item?id=45957048, addisonj suggested that the problem stems from the distinction from "local" and "global", and that with IPv6, you don't need that distinction. That quite naturally flows into the question: okay, how are these devices supposed to get global IPv6 addresses then?
    - stavros 1y ago
      Yes, with IPv6, there are are enough addresses that you don't need to use NAT. All IPv6 devices that are connected to the internet have global IPv6 addresses. I don't quite understand the question here, it seems to me that we're asking "but how could we possibly do this entirely mundane everyday thing?".
      - mort96 1y ago
        Not all devices connected to the Internet have globally unique IPv6 addresses, SLAAC and often DHCPv6 makes local v6 addresses. Where's the globally unique IPv6 address supposed to be coming from?
        stavros 1y ago
        This explains it fairly well, I think: https://thisbridgeistheroot.com/blog/dhcpv6-prefix-delegation https://thisbridgeistheroot.com/blog/dhcpv6-prefix-delegatio...
        mort96 1y ago
        So you're talking about being assigned temporary globally unique addresses, if the network the device happens to be on at any given time happens to be set up in a certain way? I still don't understand how this is supposed to help.
        stavros 1y ago
        In https://news.ycombinator.com/item?id=45957048 https://news.ycombinator.com/item?id=45957048, addisonj suggested that the problem stems from the distinction from "local" and "global", and that with IPv6, you don't need that distinction. This helps because you don't have a NAT distinguishing between "local" and "global", all devices are in the global namespace. All the comments after that have been about solving an arbitrary and ill-defined problem with goalposts that keep shifting from globally unique addresses to DNS hostnames to permanent addresses.