Proposal: DNS cache by default for ubuntu-desktop
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Wed Jun 2 10:07:11 UTC 2010
On Wednesday 02 June 2010 11:19:06 Bruno Girin wrote:
> On Wed, 2010-06-02 at 09:50 +0100, Conn O'Griofa wrote:
> > Hi Kurt,
> > As you can see from the community instructions, you need to edit your
> > /etc/resolv.conf and add the local machine's address (127.0.0.1) as
> > your first nameserver. This is a problem because any changes to this
> > file will be overwritten by NetworkManager each time it initializes a
> > new connection (which is warned in the commented section of the file).
> > The only solution that I am aware of, is to edit your active network
> > connection in NetworkManager's applet, change the setting from
> > "Automatic (DHCP)" to "Automatic (DHCP) addresses only", and then
> > manually input your DNS servers like so: "127.0.0.1, <your regular DNS
> > server 1>, <your regular DNS server 1>".
> And this in turn would break configurations where the DHCP server
> provides the name of the DNS server to clients when they connect. Such a
> configuration is extremely common for any network where people are
> transient (public and semi-public networks like libraries, company
> networks where users move from office to office, etc).
When using DNS provided by DHCP the solution is easy.
NetworkManager uses dhclient; so the solution is simply to make the change
there. In /etc/dhcp3/dhclient.conf the line:
prepend domain-name-servers 127.0.0.1;
should be present.
This will make all programs use dnsmasq by default; and dnsmasq does by
default filter out the 127.0.0.1 address and use the servers provided by DHCP.
I haven't tested what happens, if you give NetworkManager static DNS
addresses; I suppose you would then not use dnsmasq. So we need to find a way
to make it work in that case.
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