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sysadmin network: document disabling mac-learning on a bridge

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Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
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Thomas Lamprecht 2022-11-19 16:25:40 +01:00
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pve-network.adoc
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@ -567,6 +567,34 @@ 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].
Disabling MAC Learning on a Bridge
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
By default, MAC learning is enabled on a bridge to ensure a smooth experience
with virtual guests and their networks.
But in some environments this can be undesired. Since {pve} 7.3 you can disable
MAC learning on the bridge by setting the `bridge-disable-mac-learning 1`
configuration on a bridge in `/etc/network/interfaces', for example:
----
# ...
auto vmbr0
iface vmbr0 inet static
address 10.10.10.2/24
gateway 10.10.10.1
bridge-ports ens18
bridge-stp off
bridge-fd 0
bridge-disable-mac-learning 1
----
Once enabled, {pve} will manually add the configured MAC address from VMs and
Containers to the bridges forwarding database to ensure that guest can still
use the network - but only when they are using their actual MAC address.
////
TODO: explain IPv6 support?
TODO: explain OVS