[Dnsmasq-discuss] Implement --no-dns-interface?

[Tony Zhou]

Hi,

I am running dnsmasq 2.86 on openwrt, and have multiple vlans in my 
network. dnsmasq works great for dhcp purposes (for both dynamic and 
static leases) that I need for all interfaces/vlans. However, some of 
the vlans I do not need/want to have dnsmasq providing dns, but another 
dns server for content filtering purposes.

I'd prefer to keep both dns servers on the same host/router, but the way 
dnsmasq works, either binding to interfaces, or wildcard, binds to all 
port 53, so that the 2nd dns server can't bind.

It appears that when dnsmasq is set to bind to interfaces, it has to 
either offer both dns and dhcp, or skip dhcp by "--no-dhcp-interface" 
argument, but there is no counterpart "--no-dns-interface".

Setting port=0 disables dns service on all interfaces, which is not what 
I wanted as well.

I did found there were two discussions regarding this:

https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2011q4/005335.html

https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2021q3/015429.html

Running two instances of dnsmasq doesn't resolve this issue, since I 
still rely on dnsmasq's dhcp.


Thanks.