[arin-ppml] was -squatting. Why not use the /8 you already have?

William Herrin bill at herrin.us
Mon May 20 19:44:27 EDT 2019


On Fri, May 17, 2019 at 6:06 PM Owen DeLong <owen at delong.com> wrote:

> You’ll also have to rewrite the linux kernel which treats all of
> 127.0.0.0/8 as quasi-automatically configured on interface lo.
>

Actually, no. Linux treats every address in the blocks configured on
interface "lo" as local.

ifconfig lo:1 192.168.0.1 netmask 255.255.0.0
ping 192.168.55.66
response!

ifconfig lo 127.0.0.1 netmask 255.255.255.255
ping 127.0.0.2
no response.

Interface "lo" is not automatically configured by the kernel; the startup
scripts configure it.

ip netns add test
ip netns exec test ifconfig -a

Note that lo inside the namespace is down and has no ip address.

Of course, changing the startup scripts on every deployed Linux box is not
a particularly smaller task than changing the kernel.

Regards,
Bill Herrin



-- 
William Herrin
bill at herrin.us
https://bill.herrin.us/
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