[Cerowrt-devel] Wicked OT: netblock

Dave Taht dave.taht at gmail.com
Fri Oct 19 14:53:21 EDT 2018

On Fri, Oct 19, 2018 at 11:36 AM Rich Brown <richb.hanover at gmail.com> wrote:
> Sorry for distracting you from important things, but I have a question for people more knowledgeable about routing than I am...
> There's a person on the OpenWrt forum who is asking about using the netblock for some (undefined) purpose. (If you're terminally curious, or need another reason to yell at the monitor, you could look at: https://forum.openwrt.org/t/private-network-using-240-0-0-0-4-netblock/23543/5)
> MY QUESTION: I have always believed that this netblock is not routable. Is this true? (A simple yes/no answer would be sufficient.)

240 is routable if you don't use a standard martians list.
blocks 224/3.

It may not be routable on older versions of windows.

It may not even be assignable on some OSes and tools, currently.

It's certainly blocked on many a bogon filter and in our bcp38 package

An attempt to make "E" useful died a decade ago:

Still, it would be a better world with 268m more routable ips in it,
wouldn't it?

> Many thanks!
> Rich
> PS I've seen the IANA advice that those addresses should not be used. (See the final note on the thread.) I'm more interested in whether it would ever work in practice: don't most upstreams block that address?
> PPS for all you non-Vermonters, "wicked" in this context means "extremely", often in an interesting way
> _______________________________________________
> Cerowrt-devel mailing list
> Cerowrt-devel at lists.bufferbloat.net
> https://lists.bufferbloat.net/listinfo/cerowrt-devel

Dave Täht
CTO, TekLibre, LLC
Tel: 1-831-205-9740

More information about the Cerowrt-devel mailing list