Enable IPv6 routing on Linux
To enable IPv6 routing on your Linux box you can use the following command:
echo 1 > /proc/sys/net/ipv6/conf/all/forwarding
If you want to keep IPv6 routing enabled permanently, edit /etc/sysctl.conf and add the following line:
net.ipv6.conf.all.forwarding=1
Remember that IPv6 filtering rules are controlled via ip6tables.
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