IPv6 issues for internal network

[bartje]

Hello,

since a couple of weeks I have an openWRT accesspoint running as wireless repeater.
this works great, except for one thing.
Locally I have IPv6 disabled, because my ISP doesn't allow me to override the IPv6 dns server.
for IPv4, I was able to change this by changing the DNS server.
Locally I have a Pi.hole running as DHCP and DNS server.
this works fine, and still does using the accesspoint.
however, before I was able to access my pi.hole using http://pi.hole.
but now pi.hole wouldn't resolve.
I asume this is because openWRT also supplies an ipv6 dns server.

DNS Servers . . . . . . . . . . . : fd4f:da46:94a2::1
                                       192.168.178.10

for somehow this messes up my ipV4 routing for internal addesses.
what can I do to resolve this issue?
I tried disabling ipV6 completely like this

sysctl -w net.ipv6.conf.all.disable_ipv6=1
echo 1 > /proc/sys/net/ipv6/conf/all/disable_ipv6
sysctl -w net.ipv6.conf.default.disable_ipv6=1

but that for some reason breaks by repeator bridge I have to go back to factory settings.
does someone know a solution for my problem?

[trendy]

You can advertise the IPv6 of pihole as nameserver, or advertive an IPv4 nameserver in IPv6 or disable IPv6 on this interface.

[bartje]

thank you.
IPv6 is already disabled in my pi hole,
now in openWRT in interfaces is disabled it everywhere(at first I missed some places under LAN/DHCP server)
and I removed "WAN6" was not allowed to stop it.
now the issue seems to be gone.

[trendy]

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