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Re:MIT no longer owns 18.0.0.0/8 by kiallmacinnes on Wednesday April 19, 2017 @06:02PM (#14152228)
Just to be sure, with a routed network being aimed at your house, you'll actually receive two subnets (well, a single address in one subnet, and a whole second subnet). You need to use DHCP-PD or similar to make use of it.

The /128 sounds perfectly normal, and is used as a "point to point" link between the ISP and your modem. Over this, DHCP prefix delegation typically gives you a whole second subnet of /60 or so. If your modem isn't handling DHCP-PD, then all your see is 1 measly address even though they've likely allocated and pushed 295,147,905,179,352,825,856 addresses to you.

Re:MIT no longer owns 18.0.0.0/8 by flyinghamster on Wednesday April 19, 2017 @07:06PM (#14152578)
Hmmm, maybe I should revisit this. I first tried it a year or so ago with pfSense on a virtual machine. Between the IPv6 issues and generally poor performance (long story), I went back to my IPv4-only configuration with DD-WRT on a D-Link DIR-825.

I'm now using a Ubiquiti EdgeRouter POE, and maybe I should give it another shot. I'm not convinced I'll actually get a prefix from Comcast, though.

Re:MIT no longer owns 18.0.0.0/8 by mjcl on Wednesday April 19, 2017 @08:34PM (#14153022)
It may differ by region, but in the SF Bay Area I've been getting a /60 from Comcast residential for a few years now using a MikroTik router. See here: http://i.imgur.com/2mrRk01.png
Re:MIT no longer owns 18.0.0.0/8 by kiallmacinnes on Thursday April 20, 2017 @03:56AM (#14154756)
The edge router can do DHCP-PD, but it needs some configuration for it to do it, there's lots of info on the Ubuiquiti forums about it. Good luck!