Public bug reported:
Shows up in version 18.04 of Ubuntu.
I added the following 2 lines in /etc/sysctl.d/99-sysctl.conf and
/etc/sysctl.d/01-disable-ipv6.conf:
```
net.ipv6.conf.all.disable_ipv6=1
net.ipv6.conf.default.disable_ipv6=1
```
Rebooting my machine sets those parameters for "all" and "default" but not for
the sysctl options of my network interface:
```
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.ens160.disable_ipv6 = 0
```
I use disable_ipv6 above as an example.
I've also verified this with the promote_secondaries option of ipv4.
I can always restart systemd-sysctl.service at every boot and this will
set net.ipv6.conf.ens160.disable_ipv6 to 1. Unfortunately though this won't
work for devices that are hot-plugged.
Other info:
- version signature: Ubuntu 4.15.0-20.21-generic 4.15.17
- lspci is attached
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "lspci"
https://bugs.launchpad.net/bugs/1771222/+attachment/5139514/+files/lspci
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https://bugs.launchpad.net/bugs/1771222
Title:
Using sysctl to permanently disable IPv6 doesn't have any effect
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