Pihole delivers wired DHCP gateway to Wireless network

Help
1

Please follow the below template, it will help us to help you!

Expected Behaviour:

Hi i'm trying to configure Pihole as DNS and DHCP server for both my Wired and Wireless networks
RPI3 running PiHole is configured as follow :
Eth0 : Wired network 192.168.1.0/24 default gw .254 (my isp router)
Wlan0 : Wireless network 172.17.19.0/24 with RPI3 as default gw (.254)

I configured in PiHole gui the DHCP tab with my wired network
dhcp scope : 192.168.1.1 to 192.168.1.250
dhcp router : 192.168.1.254

DNS and dhcp is working properly on this Wired network

In order to also deliver dhcp on the Wireless Network i added dnsmasq-wlan0.conf file in directroy /etc/dnsmaq.d with these options :

interface=wlan0
bind-interfaces
domain-needed
domain=home.wifi
dhcp-authoritative
bogus-priv
dhcp-range=172.17.19.1,172.17.19.250,24h
dhcp-option=option:router,172.17.19.254

Actual Behaviour:

When i connect a machine to this Wireless network it receives an IP address in the scope 172.17.19.1-250 (thast's ok) but pihole/dnsmasq ignore the dhcp-option router and does not deliver
the gateway 172.17.19.254 to the macine (but tells 192.168.1.254 is the gateway :frowning: )

Int the pihole.log file i see that dhcp-option3 is ignored

Aug 16 19:07:52 dnsmasq-dhcp[6263]: DHCPDISCOVER(wlan0) 64:80:99:e4:22:44
Aug 16 19:07:52 dnsmasq-dhcp[6263]: DHCPOFFER(wlan0) 172.17.19.144 64:80:99:e4:22:44
Aug 16 19:07:52 dnsmasq-dhcp[6263]: Ignoring duplicate dhcp-option 3
Aug 16 19:07:52 dnsmasq-dhcp[6263]: DHCPREQUEST(wlan0) 172.17.19.144 64:80:99:e4:22:44
Aug 16 19:07:52 dnsmasq-dhcp[6263]: Ignoring domain dom1.xxx.net for DHCP host name L-5CG61276CC
Aug 16 19:07:52 dnsmasq-dhcp[6263]: DHCPACK(wlan0) 172.17.19.144 64:80:99:e4:22:44 L-5CG61276CC
Aug 16 19:07:52 dnsmasq-dhcp[6263]: Ignoring duplicate dhcp-option 3

So i would like to know how to configure PiHole/dnsmasq in order to deliver the right default gateway on bothe my wired and Wireless network

Thanks and regards

3

Do the wired and wireless networks really need two different separate subnets ?
Is it not possible to configure only one DHCP range on the Pi-hole web GUI for both wired and wireless ?
That way you wont have to fiddle with the dnsmasq config files.
And you wont need two default routes for the two networks.

4

Hello,
yes i want to manage 2 different subnets (wired an wireless)
and the solution was to add eth0/wlan in dhcp-option or dhcp-range lines ie
dhcp-range=wlan0,172.17.19.1,172.17.19.250,24h
dhcp-option=wlan0,option:router,172.17.19.254

Problem is solved :slight_smile:

5

This topic was automatically closed 21 days after the last reply. New replies are no longer allowed.