----
IP addresses can be specified using any syntax understood by `Net::IP`. The
-name `all` is an alias for `0/0`.
+name `all` is an alias for `0/0` and `::/0` (meaning all IPv4 and IPv6
+addresses).
The default policy is `allow`.
Listening IP
------------
+By default the `pveproxy` and `spiceproxy` daemons listen on the wildcard
+address and accept connections from both IPv4 and IPv6 clients.
+
+
By setting `LISTEN_IP` in `/etc/default/pveproxy` you can control to which IP
address the `pveproxy` and `spiceproxy` daemons bind. The IP-address needs to
be configured on the system.
-This can be used to listen only to an internal interface and thus have less
-exposure to the public internet:
+Setting the `sysctl` `net.ipv6.bindv6only` to the non-default `1` will cause
+the daemons to only accept connection from IPv6 clients, while usually also
+causing lots of other issues. If you set this configuration we recommend to
+either remove the `sysctl` setting, or set the `LISTEN_IP` to `0.0.0.0` (which
+will only allow IPv4 clients).
+
+`LISTEN_IP` can be used to only to restricting the socket to an internal
+interface and thus have less exposure to the public internet, for example:
----
LISTEN_IP="192.0.2.1"
possibly on different sub-nets. It is **not recommended** to set `LISTEN_IP` on
clustered systems.
+To apply the change you need to either reboot your node or fully restart the
+`pveproxy` and `spiceproxy` service:
+
+----
+systemctl restart pveproxy.service spiceproxy.service
+----
+
+NOTE: Unlike `reload`, a `restart` of the pveproxy service can interrupt some
+long-running worker processes, for example a running console or shell from a
+virtual guest. So, please use a maintenance window to bring this change in
+effect.
+
+
SSL Cipher Suite
----------------
Above is the default. See the ciphers(1) man page from the openssl
package for a list of all available options.
-Additionally you can define that the client choses the used cipher in
+Additionally, you can set the client to choose the cipher used in
`/etc/default/pveproxy` (default is the first cipher in the list available to
both client and `pveproxy`):