How do I disable local DNS caching?

Question

I have a small private LAN with 6 Ubuntu systems. To improve performance and simplify maintenance I implemented a DNS server on my Debian firewall/router (dig shows 0ms on repeat lookups).

Will I be able to disable the new local DNS cache on my Ubuntu systems during or after the release-upgrade?

Reference:

• https://wiki.ubuntu.com/PrecisePangolin/ReleaseNotes/UbuntuDesktop
• http://www.stgraber.org/2012/02/24/dns-in-ubuntu-12-04/

Solution

To quote my own blog post:

This dnsmasq server isn’t a caching server for security reason to avoid risks related to local cache poisoning and users eavesdropping on other’s DNS queries on a multi-user system.

So there's nothing to disable

Comments

[keepitsimpleengineer]

My Lenovo S12 (Intel Atom) laptop doesn't use Network Manager (because it doesn't work) and uses WiCd. WiCd doesn't properly configure /etc/resolv.conf with the nameserver address. So will this change break my laptop's netowrk configuration? (See: askubuntu.com/questions/127209/…)

[keepitsimpleengineer]

Another confusing thing ⋯ wiki.debian.org/HowTo/dnsmasq says "In order to configure dnsmasq to act as cache for the host on which it is running, put "nameserver 127.0.0.1" in /etc/resolv.conf to force local processes to send queries to dnsmasq." What would happen if I set there nameserver XX.XX.XX.XX to my local DNS server?

[keepitsimpleengineer]

Well the good news is 12.04 installed, network manager now works, dnsmasq is being used and not being cached, all is well, thanks.

[maazza]

this half-cache just put stackoverflow down for me >_<