Foo over UDP

Posted Oct 2, 2014 19:35 UTC (Thu) by josh (subscriber, #17465)
In reply to: Foo over UDP by raven667
Parent article: Foo over UDP

With IPv6, I wonder to what extent we need port numbers. Just give each machine a range of addresses large enough to give a unique one to each of its services, and let each address correspond to exactly one service.

Foo over UDP

Posted Oct 3, 2014 16:30 UTC (Fri) by mbunkus (subscriber, #87248) [Link] (1 responses)

You can open ports as non-root, but you cannot assign IPv6 addresses. It would be very bad if each daemon required network admin capabilities.

Additionally selecting the correct source address for outgoing connections becomes interesting in multiple-address situations. For example, if you have a DNS master server running on a machine with three IPv6 addresses then you most likely have some slave servers somewhere else which are configured to accept notifications from certain IPv6 addresses only. Therefore you have to tell your DNS server which source address to use for outgoing packates (yes, this comes from my own experience). It increases administrative work by a considerable amount.

Foo over UDP

Posted Oct 3, 2014 21:28 UTC (Fri) by josh (subscriber, #17465) [Link]

You could run each of those services in containers to which you assigned the corresponding service address.