I have a cloud instance on OVH which is accessible over IPv4 but not IPv6. It's running Ubuntu 18.04. I've found conflicting advice about using netplan vs configuring systemd-networkd directly, but all of the things I've tried don't seem to have any effect.
In OVH's web interface I have these addresses defined for me:
According to the guides I've read, I've configured netplan like this:
network: ethernets: ens3: match: macaddress: fa:16:3e:53:64:ce set-name: ens3 addresses: - 2607:5300:201:2100::5d4/64 gateway6: 2607:5300:201:2100::1 nameservers: addresses: - 2001:41d0:3:163::1 version: 2
And systemd-networkd like this:
[Match] Name=ens3 [Network] DHCP=ipv4 Gateway=2607:5300:201:2100::1 DNS=2001:41d0:3:163::1 Destination=2607:5300:201:2100::1 [Address] Address=2607:5300:201:2100::5d4/64 [Route] Destination=2607:5300:201:2100::1 Scope=link
ip addr output looks like this:
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000 link/ether fa:16:3e:53:64:ce brd ff:ff:ff:ff:ff:ff inet 220.127.116.11/32 scope global dynamic ens3 valid_lft 85848sec preferred_lft 85848sec inet6 2607:5300:201:2100::5d4/0 scope global valid_lft forever preferred_lft forever inet6 fe80::f816:3eff:fe53:64ce/64 scope link valid_lft forever preferred_lft forever
I can ping the gateway and get a response. However I cannot get a response from the server from any other location over IPv6, and a
ping6 google.com from this server results in:
PING google.com(yul02s05-in-x0e.1e100.net (2607:f8b0:4020:805::200e)) 56 data bytes From [hostname] (2607:5300:201:2100::5d4) icmp_seq=1 Destination unreachable: Address unreachable ... --- google.com ping statistics --- 5 packets transmitted, 0 received, +3 errors, 100% packet loss, time 4085ms
The only thing I haven't tried is rebooting the server, as it's live and I'd really rather not.
What am I missing? I don't really know what I'm doing, so it might be something very obvious.
EDIT: Updated the prefix to /64. This configuration also doesn't work.