I have a server application that I'm running two instances of, production and development, namely:

prod.example.com (
dev.example.com (

A third-party has written a client application which has been hardcoded to point to prod.example.com. But, I want those requests to go to the dev.example.com server and I don't have access to the third-party source code.

I do have access (temporarily) to the LAN that the client and server are running on so I can use dnsmasq to resolve prod.example.com to, at which point my work here is done and the client application will be (unknowingly) talking to the development server (or so I thought).

I've gotten as far as adding the following config to dnsmasq.conf..


..which does work, but it has the side-effect of preventing all other domains from resolving.

How can I have my cake and eat it?

  • 1
    Your side effect shouldn't happen. Nevertheless you can try editing /etc/hosts, or use addn-hosts= directive. – basin Aug 11 '16 at 17:20
  • What do you suggest putting into /etc/hosts? Mine has a bunch of mappings between and my local development URLs – Matthew Aug 12 '16 at 11:23
  • 1 prod.example.com` – basin Aug 12 '16 at 12:04

Add this line to /etc/dnsmasq.conf:


Then insert your domain names into /etc/dnsmasq.hosts:  prod.example.com.  dev.example.com.

Don't forget the period at the end of the domain name. It marks it as a TLD, not a local hostname.

As always after configuration changes, restart dnsmasq:

sudo service dnsmasq restart

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