Getting error when trying to use second pihole

Help
1

Hi

I have 2 piholes on 192.168.3.3 and 192.168.3.4

.3 is running as a DHCP server and everything is fine, add following line

dhcp-option=6,192.168.3.3,192.168.3.4 in Settings >> all settings >> Misc >> misc.dnsmasq_lines

The 2nd DNS shows in ipconfig /all shows both IP addresses as expected but I repeatedly get the error Ignoring duplicate dhcp-option 6.

I remove the dhcp options line assuming its already set some where but the 2nd IP is no longer showing in ipconfig, cant see why I am getting the duplicate error.

Uploaded as

https://tricorder.pi-hole.net/67JV5S8N/

I found entries in /etc/resolv.conf referring to the 2nd DNS server removed this but still getting the error

Many Thanks

2

Your debug log shows you've enabled dhcp.multiDNS.

[dhcp]
  active = true ### CHANGED, default = false
  (…)
  multiDNS = true ### CHANGED, default = false

This will add a DHCP option 6 (dns-server) line to your config, which conflicts with your custom configuration option:
dhcp-option=option:dns-server,0.0.0.0,0.0.0.0,0.0.0.0

To avoid that conflict, untick dhcp.multiDNS, or run:

sudo pihole-FTL --config dhcp.multiDNS false

With regards to your custom configuration:

[misc]
  dnsmasq_lines = [
    "dhcp-option=6,192.168.3.3,192.168.3.4"
  ] ### CHANGED, default = []

As 192.168.3.3 is the IP of the Pi-hole machine that created the debug log, you could consider to write that as:
"dhcp-option=6,0.0.0.0,192.168.3.4,0.0.0.0"
mimicking the effect of dhcp.multiDNS (where 0.0.0.0 means 'the machine's current IPv4').

3

Thankyou, this has stopped the errors coming in and I still have the 2 DNS servers listed