On Thu, 2 Jun 2022 11:01:53 +0000, Warren Boyd wrote:
systemd's resolver also listens on 127.0.0.53:53. This will ensure it avoids any other resolver, listening on only localhost.
You know, I didn’t believe it, but you can indeed have multiple listeners on the same port, just using different addresses in the loopback range. So having multiple loopback addresses isn’t *completely* pointless. But we probably don’t need 16 million of them ...
When I first read the article, I did ponder why attempt to free up IPv4, instead of looking at IPv6.
IPv6 adoption continues, but at a pace too slow for some. (I did wonder why, since they were going to break things anyway, they didn’t go for 32-bit port numbers...) According to this article <https://arstechnica.com/information-technology/2010/09/there-is-no-plan-b-why-the-ipv4-to-ipv6-transition-will-be-ugly/>, back when there were still unused IPv4 addresses available to allocate, they were being used up at the rate of 200 million per year. So a new /8 block is only going to postpone the inevitable by about a month.