By Kirill
I’m trying a very simple setup where two nodes in my VPC have IPv6 enabled and a working radvd which assigns ULAs to eth1 (e.g. fdaa::/64 and advertises them. Both have the following /etc/radvd.conf:
interface eth1
{
AdvSendAdvert on;
MinRtrAdvInterval 30;
MaxRtrAdvInterval 100;
AdvDefaultLifetime 0;
prefix fdaa::/64 {
};
};
I can confirm that advertisements are send to ff02::1 but they are not received on the other machine. So, pinging one node from another using the assigned ULAs does not work. What is the problem?
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Hi there,
As far as I know, DigitalOcean VPC private networking is IPv4 only. The VPC isn’t a shared L2 segment, so IPv6 multicast like RA/ND to ff02::1 on the private interface won’t be delivered. That’s why your ULAs on eth1 don’t get advertised or reachable.
Seems to be listed as a limitation here: https://docs.digitalocean.com/products/networking/ipv6/details/limits/
Instead, you could use public IPv6 on the primary interface and route over that, stick to IPv4 on the VPC.
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