Hello everyone,

after changing the hardware and updating to Unraid 7.1.4 I have problems with my Pi-Hole Docker container / the ipv6 settings of the Docker Containers, which can no longer be operated in ipv6.

IP Adress of the Unraid Host: 192.168.1.2 | fda4:748:9d5c:0:1:1:1:2

IP Adress of the PiHole Container: 192.168.1.3 | fda4:748:9d5c::1:1:1:3

The following settings are currently set:

Network Settings:

Routing Table:

Docker Settings:

Docker pi-Hole Container

docker run
  -d
  --name='Pihole-DoT-DoH'
  --net='br0'
  --ip='192.168.1.3'
  --ip6='fda4:748:9d5c:0:1:1:1:3/64'
  --pids-limit 2048
  -e TZ="Europe/Berlin"
  -e HOST_OS="Unraid"
  -e HOST_HOSTNAME="Tower"
  -e HOST_CONTAINERNAME="Pihole-DoT-DoH"
  -e 'TCP_PORT_53'='53'
  -e 'UDP_PORT_53'='53'
  -e 'UDP_PORT_67'='67'
  -e 'TCP_PORT_80'='80'
  -e 'TCP_PORT_443'='443'
  -e 'DNS1'='127.1.1.1#5153'
  -e 'DNS2'='127.2.2.2#5253'
  -e 'TZ'='Europe/Berlin'
  -e 'WEBPASSWORD'='MaskedPassword'
  -e 'INTERFACE'='eth0'
  -e 'ServerIP'='192.168.1.3'
  -e 'ServerIPv6'='fda4:748:9d5c:0:1:1:1:3'
  -e 'IPv6'='True'
  -e 'DNSMASQ_LISTENING'='all'
  -v '/mnt/user/appdata/pihole-dot-doh/pihole/':'/etc/pihole/':'rw,slave'
  -v '/mnt/user/appdata/pihole-dot-doh/dnsmasq.d/':'/etc/dnsmasq.d/':'rw,slave'
  -v '/mnt/user/appdata/pihole-dot-doh/':'/config':'rw,slave'
  --cap-add=NET_ADMIN
  --restart=unless-stopped
  --hostname ns 'devzwf/pihole-dot-doh:latest'

docker: Error response from daemon: invalid config for network br0: invalid endpoint settings:
* invalid IPv6 address: fda4:748:9d5c:0:1:1:1:3/64
* user specified IP address is supported only when connecting to networks with user configured subnets.
See 'docker run --help'.

The command failed.

Does anyone have an idea and can help me?

Edited July 8, 2025Jul 8 by DerSIlver

I'm not sure, but "fda4...." is a so called ULA (universal local address).

It cannot be used for routing, it is plainly local.

So it is not usable for pihole which needs to access hosts on the internet for it's work.

Consider to use a "real" prefix instead

Hi Mam59,

e.g. the prefix of the Fritzbox and then 1:1:1:3?

--ip6='2a02:8071:masked:masked:1:1:1:3'

-e “ServerIPv6”='2a02:8071:masked:masked:1:1:1:3'

-e “IPv6”='True'

docker: Error response from daemon: invalid config for network br0: invalid endpoint settings:

* invalid IPv6 address: 2a02:8071:masked:masked:1:1:1:3

* user specified IP address is supported only when connecting to networks with user configured subnets.

See “docker run --help”.

Unfortunately this did not work either.

8 hours ago, DerSIlver said:

e.g. the prefix of the Fritzbox and then 1:1:1:3?

should work unless you want to be reachable from the internet. The Fritzbox does not allow static addresses, it always "creates" the SLAAC address (derived from the MAC address), if you want it or not.

But you don't need IPV6 for pihole at all, turn it off and you are done.

(V6 DNS addresses can be queried over V4 LAN too, so there will be no loss in functionality)