I have two Ubuntu Servers on my home network: one acting as a router/gateway (Router), and the other acting as a media/multipurpose server (Server). I've been trying to enable IPv6 on both, but I'm running into problems getting it working on the Server.
IPv6 works well on the Router, and I can successfully use ping6 to reach ipv6.google.com... but on the Server, I get Network is unreachable errors whenever I try to use ping6.
For a firewall on both machines, I'm using firewalld. I've added the service "dhcpv6-client" and "dhcpv6" to the relevant zones. I've also set up DHCPv6 on LAN via AdGuardHome.yaml:
dhcp:
enabled: true
interface_name: enp3s0
local_domain_name: lan
dhcpv4:
gateway_ip: 10.0.0.1
subnet_mask: 255.255.255.0
range_start: 10.0.0.2
range_end: 10.0.0.254
lease_duration: 86400
icmp_timeout_msec: 1000
options: []
dhcpv6:
range_start: 2001:db8:100::2
lease_duration: 86400
ra_slaac_only: false
ra_allow_slaac: true
...and on the server, I can see that it's getting a local and global IPv6 address via ip -c a:
2: enp3s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether d8:bb:c1:d8:6f:0d brd ff:ff:ff:ff:ff:ff
inet 10.0.0.238/24 metric 100 brd 10.0.0.255 scope global dynamic enp3s0
valid_lft 85023sec preferred_lft 85023sec
inet6 2001:db8:100::2/128 scope global
valid_lft forever preferred_lft forever
inet6 fe80::dabb:c1ff:fed8:6f0d/64 scope link
valid_lft forever preferred_lft forever
However, when I run "ip -6 neigh" on the Router, all of the links are stale (enp3s0 is LAN and enp1s0 is WAN):
fe80::10:18ff:febc:bda9 dev enp1s0 lladdr 02:10:18:bc:bd:a9 STALE
fe80::1af0:e3bf:955e:7922 dev enp3s0 lladdr dc:a6:32:2a:c9:80 STALE
fe80::221f:3bff:fe6c:ef6e dev enp3s0 lladdr 20:1f:3b:6c:ef:6e STALE
fe80::d358:7828:fa79:4a97 dev enp3s0 lladdr 38:86:f7:06:bd:21 STALE
fe80::76d4:23ff:febc:e2be dev enp3s0 lladdr 74:d4:23:bc:e2:be STALE
fe80::d9c7:c6cc:58c8:1181 dev enp3s0 lladdr 38:86:f7:16:3b:d7 STALE
fe80::ac9a:b6ff:feec:4a7e dev enp3s0 lladdr ae:9a:b6:ec:4a:7e STALE
fe80::dabb:c1ff:fed8:6f0d dev enp3s0 lladdr d8:bb:c1:d8:6f:0d STALE
fe80::5821:7eff:fe1a:2875 dev enp3s0 lladdr 5a:21:7e:1a:28:75 STALE
fe80::dabb:c1ff:fed8:6f0d dev enp1s0 FAILED
fe80::201:5cff:fe8e:5646 dev enp1s0 lladdr 00:01:5c:8e:56:46 router STALE
fe80::22df:b9ff:fe4b:9a8c dev enp3s0 lladdr 20:df:b9:4b:9a:8c STALE
fe80::7e04:3679:534b:707f dev enp3s0 lladdr e8:84:a5:8f:c4:01 STALE
fe80::aba:5fff:fec2:5b9c dev enp3s0 lladdr 08:ba:5f:c2:5b:9c STALE
2001:558:6012:51::1 dev enp1s0 lladdr 00:01:5c:8e:56:46 router STALE
IPv6 is not disabled in /etc/sysctl.conf on the Server:
net.ipv6.conf.all.disable_ipv6=0
net.ipv6.conf.default.disable_ipv6=0
net.ipv6.conf.lo.disable_ipv6=0
/etc/netplan/00-installer-config.yaml on the Server:
network:
version: 2
ethernets:
enp3s0:
dhcp4: true
dhcp6: true
/etc/network/interfaces on the Server:
source /etc/network/interfaces.d/*
auto enp3s0
iface enp3s0 inet6 dhcp
iface enp3s0 inet dhcp
I'm probably overlooking something simple here, since I'm new to IPv6. Any help that anyone could provide in sorting this problem out would be greatly appreciated!
