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I'm trying to setup IPv6 on my OVH server using their guide.

In the article they recommend to

disable IPv6 autoconf and router advertising to prevent known issues
You can do so by adding the following lines to your sysctl.conf file, which is located in /etc/sysctl.conf:
net.IPv6.conf.all.autoconf=0
net.IPv6.conf.all.accept_ra=0
Once this has been done, you can apply those rules by executing the following command: sh sysctl -p

I added those parameters to my the sysctl config like described. When trying to apply the config using sysctl -p I get the following error(s):

sysctl: cannot stat /proc/sys/net/IPv6/conf/all/autoconf: No such file or directory  
sysctl: cannot stat /proc/sys/net/IPv6/conf/all/accept_ra: No such file or directory

I'm on Debian 10 with a recent kernel:

# cat /proc/version
Linux version 4.19.0-9-amd64 (debian-kernel@lists.debian.org) (gcc version 8.3.0 (Debian 8.3.0-6)) #1 SMP Debian 4.19.118-2+deb10u1 (2020-06-07)
# cat /etc/os-release
PRETTY_NAME="Debian GNU/Linux 10 (buster)"
NAME="Debian GNU/Linux"
VERSION_ID="10"
VERSION="10 (buster)"
VERSION_CODENAME=buster
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"
Michael Hampton
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Christian Klemm
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1 Answers1

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It's a typo. ipv6 should be in lowercase.

net.ipv6.conf.all.autoconf=0
net.ipv6.conf.all.accept_ra=0
Michael Hampton
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  • Thanks for the advice, do you have any good resource on how to switch to systemd-networkd? – Christian Klemm Aug 05 '20 at 16:54
  • See https://wiki.debian.org/SystemdNetworkd and [The modern network configuration without GUI](https://www.debian.org/doc/manuals/debian-reference/ch05.en.html#_the_modern_network_configuration_without_gui) in the Debian manual. – Michael Hampton Aug 05 '20 at 16:57
  • Much appreciated. However I don't think it will be possible to incorporate that with the OVH network, they are doing a lot of autoconfig stuff. – Christian Klemm Aug 05 '20 at 18:05