On 12/06/12 11:24, Thomas Hood wrote:
> Hmm, just tested this myself.  You can't use "except-interface=lo"; it
> seems you have to use "listen-address=10.1.2.3".  Perhaps Simon knows a
> better way.
> 

If you want to listen on an address which doesn't appear on an interface
(ie 127.0.1.1) then you have to use --listen-address.

The rules for 127.0.0.1 are slightly arcane too: If you use -interface
and --except-interface, then dnsmasq will assume that you want it to
listen on the address of any loopback interfaces it finds as well. In
practise that means 127.0.0.1

So

dnsmasq --interface=eth0

will listen on the address(es) of eth0 and 127.0.0.1.

If you use --listen-address, then dnsmasq assumes you want more control
and only uses the addresses you actually give

so

dnsmasq --listen-address=127.0.1.1

will _not_ listen on 127.0.0.1


Given this, it makes sense to use 127.0.1.1 (or any address in
127.0.0.0/8 that doesn't appear on lo) for nm-dnsmasq. Because 127.0.1.1
doesn't appear on lo, another dnsmasq instance will not try and listen
on it, and the only thing required to get the two dnsmasq instances to
co-exist is --bind-interfaces.


Cheers,

Simon.

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to network-manager in Ubuntu.
https://bugs.launchpad.net/bugs/959037

Title:
  NM-controlled dnsmasq prevents other DNS servers from running, yet
  network-manager doesn't Conflict with their packages

Status in “djbdns” package in Ubuntu:
  New
Status in “dnsmasq” package in Ubuntu:
  Confirmed
Status in “network-manager” package in Ubuntu:
  Triaged

Bug description:
  As described in
  https://blueprints.launchpad.net/ubuntu/+spec/foundations-p-dns-
  resolving, network manager now starts a dnsmasq instance for local DNS
  resolving.

  That breaks the default bind9 and dnsmasq installations, for people that 
actually want to install a DNS server.
  Having to manually comment out "#dns=dnsmasq" in 
/etc/NetworkManager/NetworkManager.conf doesn't sound good, and if it stays 
that way, it should be moved to the bind9 and dnsmasq postinst scripts.

  Please make network-manager smarter so that it checks if bind9 or
  dnsmasq are installed, so that it doesn't start the local resolver in
  that case.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/djbdns/+bug/959037/+subscriptions

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