Comment 5 for bug 1616282

The failure is related to RFC 6204. If we are launching nodes on an IPv6 cloud that uses RA adverts, and we are forwarding packets from the virtual infrastructure that exists on the node, we need to use the special sysctl flag accept_ra, and set it to 2. By default, Linux when ipv6 forwarding is enabled, will ignore RAs from other devices. Check out the RFC for details. The accept_ra = 2 is the workaround used for customer premises equipment which recieves RAs from upstream sources (like their ISP) and forwards packets.