net.ipv4.ip_forward = 1 net.ipv6.conf.all.forwarding = 1
To use dynamic ip configuration instead of static in ipv6 with fowarding on:
net.ipv6.conf.all.accept_ra = 2
net.ipv6.conf.eth0.disable_ipv6 = 1 #replace eth0 with desired interface or all
net.ipv6.conf.default.addr_gen_mode = 0 net.ipv6.conf.eth0.addr_gen_mode = 0