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From: peasthope on 10 Aug 2010 19:20
From: Tom H <tomh0665(a)gmail.com.>
Date: Mon, 9 Aug 2010 13:16:42 -0400
> Why did you install it[dnsmasq]?

* Local name resolution is more efficient than having
each local machine query the ISP nameserver.
* The ISP can change the IP address of a nameserver at will.
My dnsmasq system will get a new address by dhcp and
consequently name resolution in my LAN will continue.
If a machine on my LAN relies on a static address for
an ISP namerserver, resolution will fail when the
address of the nameserver changes.

> [pi.shawcable.net] It's your ISP's search domain.

OK, but if a system has an address for a working nameserver,
what is the value or significance of the search domain?

From: Jaime Di Cristina <jaime.dc(a)gmail.com>
Date: Mon, 9 Aug 2010 12:44:50 -0400
> /etc/resolv.conf points to the localhost so that other programs are
> directed to the dnsmasq cache instead of going directly to your real
> DNS servers. Since dnsmasq takes care of sending queries to upstream
> servers there is no need for other programs to be aware of those
> servers.

That all makes perfect sense; but why does dnsmasq keep upstream
addresses in /var/run/dnsmasq/resolv.conf rather than in
/etc/dnsmasq/resolv.conf? I don't see anything in Debian policy
dictating use of /var/run/.

One last point: my Linux router might not need resolvconf.
This is from http://en.wikipedia.org/wiki/Resolvconf
"The resolvconf program is only necessary when a system has
multiple programs that need to dynamically modify the nameserver
information. In a simple system where the nameservers do not
change often or are only changed by one program, the resolv.conf
configuration file is adequate."

Thanks for the help, ... Peter E.


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