network manager, manually specifying DNS servers for PPPoE connection does not work

[Silviu C.]

It seems network manager will not take into account the fact that I choose to only get my IP address from the ISP via DHCP. I selected the relevant option in the configuration panel. If I click on "connection information" it will show me as using the DNS servers I had specified but doing a "nslookup google.com" revealed that I was using my ISPs DNS.

I will attach relevant screenshot and log file.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: network-manager 0.9.3.995+git201203152001.04b2a74-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-20.33-generic 3.2.12
Uname: Linux 3.2.0-20-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.95-0ubuntu1
Architecture: amd64
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
Date: Thu Mar 29 10:48:08 2012
IfupdownConfig:
 auto lo
 iface lo inet loopback
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120301)
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
 WimaxEnabled=true
ProcEnviron:
 TERM=xterm
 LANG=en_US.UTF-8
 SHELL=/bin/bash
RfKill:

SourcePackage: network-manager
UpgradeStatus: No upgrade log present (probably fresh install)
mtime.conffile..etc.NetworkManager.NetworkManager.conf: 2012-03-28T19:28:07.970746

[Mathieu Trudel-Lapierre (cyphermox)]

When you're connected to that DSL connection, could you also attach the file /run/nm-dns-dnsmasq.conf ?

Thanks!

[Charles Peters II (cp)]

Undocumented feature, disable the broken DNS caching server by commenting out the dns line.

$ cat /etc/NetworkManager/NetworkManager.conf
[main]
plugins=ifupdown,keyfile
#dns=dnsmasq

[ifupdown]
managed=false

[Silviu C. (silviucc)]

This is the file as it currently looks. It changes content as I change dns server settings in the gnome network-manager config utility.

[Silviu C. (silviucc)]

cp, I commented out that line, did a sudo service network-manager restart but I still get the DNS servers from my ISP not the one I want to use.

silviu@silviu-pangolin:~$ cat /etc/NetworkManager/NetworkManager.conf
[main]
plugins=ifupdown,keyfile
#dns=dnsmasq

[ifupdown]
managed=false

[Mathieu Trudel-Lapierre (cyphermox)]

Indeed, and I think this is because ppp/pptp silently update resolv.conf regardless of settings. I'm still looking into this but it seems like it may be related to bug 980579. I'm hesitant to mark it as a duplicate until I can be sure it's really the same issue, though.

[Mathieu Trudel-Lapierre (cyphermox)]

New tag: nm-ppp-dns-settings

I can't really mark other bugs related to this as duplicates yet, because I'm not certain enough that it's really the same issue; it's possible this may be in pptp or ppp too; so for now I'll use this to track down all the similar symptoms bugs like this one.