Add simple ipv6 rotation (#668)

* Create ipv6-rotation-simple.md

* Add ipv6-rotation-simple

* Update title for IPv6 rotation documentation

---------

Co-authored-by: Émilien (perso) <4016501+unixfox@users.noreply.github.com>

docs/ipv6-rotation-simple.md

@@ -0,0 +1,53 @@
+# Simple IPv6 rotation for avoid YouTube blocking (SLAAC)
+
+## Requirements
+- A host with IPv6 support providing a ``/64`` IPv6 prefix. (If your server provider provides smaller prefix lengths such as ``/128`` it is not sufficient for rotation)
+- Docker with IPv6 networking enabled so that invidious can access the internet via IPv6
+
+## Setup
+### If the IPv6 address on your host is dynamically configured via Stateless Address Autoconfiguration (SLAAC)
+Add the following to ``/etc/network/interfaces`` or equivalent configuration.
+
+Note: The configuration syntax shown assumes use of ifupdown (/etc/network/interfaces). On systems using Netplan, systemd-networkd, or NetworkManager, IPv6 privacy extensions must be enabled via their respective configuration formats. 
+
+This will enable the IPv6 privacy extensions which will allow the kernel to automatically generate new random IPv6 addresses which are temporary and stay assigned for the specified lifetime.
+```
+iface eth0 inet6 auto
+    privext 2
+    pre-up echo 2 > /proc/sys/net/ipv6/conf/eth0/use_tempaddr
+    pre-up echo 3600 > /proc/sys/net/ipv6/conf/eth0/temp_valid_lft
+    pre-up echo 1800 > /proc/sys/net/ipv6/conf/eth0/temp_prefered_lft
+```
+In this case the prefered lifetime is set to 30 minutes and the valid lifetime to 1 hour. Every 30 minutes a new temporary address will be assigned by the kernel.
+The old address will be kept for 30 minutes longer (valid lifetime) for any remaining connections using it.
+
+
+### If your IPv6 configuration is static
+
+Run the below script every 30 minutes via a cronjob as root
+
+``/usr/local/bin/ipv6-rotate.sh``
+```
+#!/bin/bash
+# Set your network prefix (first 64 bits)
+PREFIX="2001:db8:1234:5678"
+INTERFACE="eth0"
+
+# Generate random interface ID (last 64 bits)
+INTERFACE_ID=$(printf "%04x:%04x:%04x:%04x" $((RANDOM % 65536)) $((RANDOM % 65536)) $((RANDOM % 65536)) $((RANDOM % 65536)))
+
+#Enable prefering temporary addresses
+echo 2 > /proc/sys/net/ipv6/conf/"$INTERFACE"/use_tempaddr
+
+# Add the IPv6 address
+ip -6 addr add "${PREFIX}":"${INTERFACE_ID}"/64 dev "$INTERFACE" valid_lft 3600 preferred_lft 1860
+```
+Replace the ``PREFIX`` and ``INTERFACE`` variables according to your setup. Note that if your IPv6 address is ``2001:db8:1234:5678::1``, the correct prefix is ``2001:db8:1234:5678``.
+
+#### In the crontab:
+```
+*/30 * * * * /usr/local/bin/ipv6-rotate.sh
+```
+Don't forget to make it executable: ``chmod +x /usr/local/bin/ipv6-rotate.sh``
+
+

mkdocs.yml

@@ -38,6 +38,7 @@ nav:
     - 'takedown.md'
     - 'hide-instance-behind-proxy-server.md'
     - 'ipv6-rotator.md'
+    - 'ipv6-rotation-simple.md'
     - 'improve-public-instance.md'
   - 'For Developers':
     - 'api.md'