base-files/sysctl.conf: add statement to enable IPv6 forwarding

package/base-files/src/etc/sysctl.conf

@@ -4,6 +4,7 @@
 #kernel.panic = 3
 # Enable packet forwarding
 #net.ipv4.ip_forward = 1
+#net.ipv6.conf.all.forwarding = 1
 # Disables IP dynaddr
 #net.ipv4.ip_dynaddr = 0
 # Disable ECN