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network: shortly document disabling ipv6 support

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Given that quite a few HOWTOs on the internet suggest disabling ipv6
support via kernel commandline, which can cause quite many undesired
side-effects (e.g. ip6tables as used in pve-firewall errors out)
this patch adds a short section documenting, that disabling ipv6 is
not necessary usually and if needed better done via sysctl.

Signed-off-by: Stoiko Ivanov <s.ivanov@proxmox.com>
This commit is contained in:
Stoiko Ivanov 2021-05-05 16:36:30 +02:00 committed by Thomas Lamprecht
parent 41a88ff3ab
commit 024d3706c0
1 changed files with 19 additions and 0 deletions
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pve-network.adoc
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@ -548,6 +548,25 @@ iface vmbr0 inet manual
----
Disabling IPv6 on the Node
~~~~~~~~~~~~~~~~~~~~~~~~~~
{pve} works correctly in all environments, irrespective of whether IPv6 is
deployed or not. We recommend leaving all settings at the provided defaults.
Should you still need to disable support for IPv6 on your node, do so by
creating an appropriate `sysctl.conf (5)` snippet file and setting the proper
https://www.kernel.org/doc/Documentation/networking/ip-sysctl.txt[sysctls],
for example adding `/etc/sysctl.d/disable-ipv6.conf` with content:
----
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
----
This method is preferred to disabling the loading of the IPv6 module on the
https://www.kernel.org/doc/Documentation/networking/ipv6.rst[kernel commandline].
////
TODO: explain IPv6 support?
TODO: explain OVS