I'm using openwrt for a while and l'm loving it. Just today I needed to do some DNS testing and changed the systems dns server (from 8.8.8.8 to custom dns). For one of the clients it's not the solution, so I for this system we need to change the used DNS server. The client uses DHCP, so I made a reservation in the GUI, works fine.

using vi I have been modifying the /etc/config/dhcp file, but none of the modifications change's the used DNS server to what I'm putting in the /etc/config/dhcp file. What is the correct option to change the used DNS server just for this one client with dhcp static lease ?

Have you tried in your host section:

list 'dhcp_option' '6,8.8.4.4'

and then

/etc/init.d/dnsmasq reload (or reboot router)

(Last edited by WWTK on 29 Oct 2017, 18:23)

Yes, but this doesn't do the job, I've tried the following options

option 'dhcp_option' '6,8.8.4.4'
list 'dhcp_option' '6,8.8.4.4'
option dhcp_option '6,8.8.4.4'

Non of them are successful, is there any documentation about the options of the dhcp service in Openwrt ?

yes, but i'm guessing you read this already...

https://wiki.openwrt.org/doc/uci/dhcp

http://www.networksorcery.com/enp/proto … ptions.htm

(Last edited by WWTK on 4 Nov 2017, 00:26)

option dns in static lease stanza?

I'm also not sure what options aren't there in the stripped down dnsmasq.....   You may need a build with dnsmasq-full

something like this may also work (or not LOL)

# Assign alternate DNS for select hosts
# Set Specific Clients to be affected
dhcp-mac=set:altdns,XX:XX:XX:XX:XX:XX #PC 1
dhcp-mac=set:altdns,YY:YY:YY:YY:YY:YY #PC 2

# Set Alternate DNS
dhcp-option=tag:altdns,option:dns-server,208.122.23.22,208.122.23.23