Re: NetworkManager, dns= and resolv.conf override

[Thomas HUMMEL <thomas hummel pasteur fr>]

Hello,

I just experienced the situation described below again. Still don't know 
why NM would behave differently if resolv.conf first came via dhcp.

Thanks for your help.

--
TH
On 3/23/20 10:59 AM, Thomas HUMMEL wrote:
> On 3/16/20 4:56 PM, Thomas HUMMEL wrote:
> > Hello
> >
> > actually I was able to reproduce the thing in a simplier way:
>
> Hello, did you have the time to look into this ?
>
> thanks.
>
> --
> TH.
>
> > 0/ I'm starting from here
> > ##########################
> >
> > - configuration : no 'dns=' directive :
> > - an auto profile
> > - a manual profile (active)
> > - an empty /etc/resolv.conf
> >
> > # grep -i dns /etc/NetworkManager/NetworkManager.conf 
> > /etc/NetworkManager/conf.d/*
> > /etc/NetworkManager/conf.d/pasteur.conf:#dns=none
> >
> > # cat /etc/sysconfig/network-scripts/ifcfg-enp33s0f0
> > DEVICE=enp33s0f0
> > BOOTPROTO=dhcp
> > HWADDR=ac:1f:6b:c8:ee:16
> > ONBOOT=yes
> >
> > # cat /etc/sysconfig/network-scripts/ifcfg-xcat-enp33s0f0
> > TYPE=Ethernet
> > PROXY_METHOD=none
> > BROWSER_ONLY=no
> > BOOTPROTO=none
> > IPADDR=192.168.152.3
> > PREFIX=20
> > DEFROUTE=yes
> > IPV4_FAILURE_FATAL=no
> > IPV6INIT=yes
> > IPV6_AUTOCONF=yes
> > IPV6_DEFROUTE=yes
> > IPV6_FAILURE_FATAL=no
> > IPV6_ADDR_GEN_MODE=stable-privacy
> > NAME=xcat-enp33s0f0
> > UUID=9b43d5ac-0c92-4dcf-b1b2-113ee146c052
> > DEVICE=enp33s0f0
> > ONBOOT=yes
> > AUTOCONNECT_PRIORITY=9
> > MTU=1500
> >
> > # nmcli con show
> > NAME              UUID                                  TYPE DEVICE
> > xcat-enp33s0f0    6830dc55-e121-4c10-8b64-cf692f063505  ethernet 
> > enp33s0f0
> > ib0               2ab4abde-b8a5-6cbc-19b1-2bfb193e4e89  infiniband  ib0
> > System enp33s0f0  03a3d6a6-33d2-bba1-f78c-e1d7861520ba  ethernet    --
> >
> > # cat /etc/resolv.conf
> > # Generated by NetworkManager
> >
> > 1/ deactivate active connection
> > ################################
> >
> > - auto profile takes over, gets dns params via dhcp
> >
> > # nmcli con down xcat-enp33s0f0
> > Connection 'xcat-enp33s0f0' successfully deactivated (D-Bus active 
> > path: /org/freedesktop/NetworkManager/ActiveConnection/3)
> >
> > # nmcli con show
> > NAME              UUID                                  TYPE DEVICE
> > System enp33s0f0  03a3d6a6-33d2-bba1-f78c-e1d7861520ba  ethernet 
> > enp33s0f0
> > ib0               2ab4abde-b8a5-6cbc-19b1-2bfb193e4e89  infiniband  ib0
> > xcat-enp33s0f0    9b43d5ac-0c92-4dcf-b1b2-113ee146c052  ethernet    --
> >
> > # cat /etc/resolv.conf
> > # Generated by NetworkManager
> > search maestro.pasteur.fr
> > nameserver 192.168.149.101
> > nameserver 192.168.149.102
> >
> > 2/ reactivate manual connection empties /etc/resolv.conf
> > #########################################################
> >
> > - manual profile takes over
> > - /etc/resolv.conf is emptied
> >
> > # nmcli con up xcat-enp33s0f0
> > Connection successfully activated (D-Bus active path: 
> > /org/freedesktop/NetworkManager/ActiveConnection/7)
> >
> > # nmcli con show
> > NAME              UUID                                  TYPE DEVICE
> > xcat-enp33s0f0    9b43d5ac-0c92-4dcf-b1b2-113ee146c052  ethernet 
> > enp33s0f0
> > ib0               2ab4abde-b8a5-6cbc-19b1-2bfb193e4e89  infiniband  ib0
> > System enp33s0f0  03a3d6a6-33d2-bba1-f78c-e1d7861520ba  ethernet    --
> >
> > # cat /etc/resolv.conf
> > # Generated by NetworkManager
> >
> > 3/ manually write /etc/resolv.conf and reactivate the manual connection
> > #################################################################
> >
> > - manual connection is reactivated
> > - leaves /etc/resolv.conf untouched
> >
> > # cat <<EOF > /etc/resolv.conf
> >  > search maestro.pasteur.fr
> >  > nameserver 192.168.149.101
> >  > nameserver 192.168.149.102
> >  > EOF
> >
> > # cat /etc/resolv.conf
> > search maestro.pasteur.fr
> > nameserver 192.168.149.101
> > nameserver 192.168.149.102
> >
> > # nmcli con show
> > NAME              UUID                                  TYPE DEVICE
> > xcat-enp33s0f0    9b43d5ac-0c92-4dcf-b1b2-113ee146c052  ethernet 
> > enp33s0f0
> > ib0               2ab4abde-b8a5-6cbc-19b1-2bfb193e4e89  infiniband  ib0
> > System enp33s0f0  03a3d6a6-33d2-bba1-f78c-e1d7861520ba  ethernet    --
> >
> > # nmcli con up xcat-enp33s0f0
> > Connection successfully activated (D-Bus active path: 
> > /org/freedesktop/NetworkManager/ActiveConnection/8)
> >
> > # cat /etc/resolv.conf
> > search maestro.pasteur.fr
> > nameserver 192.168.149.101
> > nameserver 192.168.149.102
> >
> > Can you help me understand what seems to be an inconsistent behavior 
> > regarding override of /etc/resolv.conf ?
> >
> > Thanks
> >
> > --
> > Thomas HUMMEL
> > _______________________________________________
> > networkmanager-list mailing list
> > networkmanager-list gnome org
> > https://mail.gnome.org/mailman/listinfo/networkmanager-list
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