Hi Joseph,
Thank you for the quick reply.
I did as instructed and got the specified upstream kernel installed.
```
~$ uname -a
Linux ubuntu 4.17.0-041700rc5-generic #201805132030 SMP Mon May 14 00:32:50 UTC
2018 x86_64 x86_64 x86_64 GNU/Linux
```
Problem persists after reboot:
```
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.ens33.disable_ipv6 = 0
```
Changing to Confired, and adding tag.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
** Tags added: kernel-bug-exists-upstream
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https://bugs.launchpad.net/bugs/1771222
Title:
Using sysctl to permanently disable IPv6 doesn't have any effect
Status in linux package in Ubuntu:
Confirmed
Bug description:
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
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