Bug 314811

Which dhcp client do you use? My guess is that your dhclient client is not respecting NetworkManager's configuration and trying to get both IPv4 and IPv6 addresses. Please, also send me the NetworkManager's log when the problem happens.

Created attachment 77186 [details]
snapshot of what the software manager display about dhcp software


here is a snapshot of what the software manager display about dhcp software.

Created attachment 77189 [details]
network manager log

fist i use ipv4 only
then
i add ipv6
then
i uncheck "ipv4 required..."

What is contents of file /etc/NetworkManager/system-connections/<connection name>? Remove any line containing screts before pasting it here.

[802-3-ethernet]
port=mii
mac-address=00:

[connection]
id=Free filaire (ethernet)
uuid=63c757d7-da4f-4892-af1f-1df7deba3147
type=802-3-ethernet
timestamp=1360672138

[ipv6]
method=auto
may-fail=false
ip6-privacy=0

[ipv4]
method=auto

The configuration is correct. By what I could understand about NetworkManager it always tries both IPv4 and IPv6. The "may-fail" flag is used just to prevent NetworkManager from trying again and again to get configuration for IPv4 or IPv6, but it always tries both at least once, only when one of them fails it uses the may-fail flag to stop trying. With that in mind I think there is no IPv6-only mode in NetworkManager, I mean, there is no way to force NetworkManager to ignore an IPv4 DHCP server except by setting the interface to static address.

 
in "ipv4" tab i tried : method : unactivated

now i have this :

1. i think it is not normal when you choose "ipv4 not required" it remains these statements :

[ipv4]
method=auto

2.
in "ipv4" tab i tried : method : unactivated

now i have this :

[802-3-ethernet]
port=mii
mac-address=00:

[connection]
id=Free filaire (ethernet)
uuid=63c757d7-da4f-4892-af1f-1df7deba3147
type=802-3-ethernet
timestamp=1360676964

[ipv6]
method=auto
may-fail=false
ip6-privacy=0

[ipv4]
method=disabled

i make test with http://ds.testmyipv6.com/

ipv4test fails
ipv6test succeeds

with another site i ping my pc :
- ipv6 address with success
- ipv4 address with failure

i can rich opensuse site, kde sites , in general a very few sites 

definitively in case we don't want ipv4 it must have a flag "unactivate in the ipv4 part of the networkmanager connection file according to do nothing and keep ipv4 settings for future use

P.S. i found errors about kcm-networkmanager in adding dns
- it accepts only 2a01:5d8:e0ff::1
- it don't accept address like 2A01:5D8:E0FF::1
you can't write or past such address

curiously once an address 2a01:5d8:e0ff::1 is added then it displays  2A01:5D8:E0FF::1 !

and a very annoying one :

the windows about to give root password to record a modification is always displayed behind the modification window, (rarely before)

Git commit e3ed3cb5b3e57ff427f5d64dec27add6b1f3f678 by Lamarque V. Souza.
Committed on 12/02/2013 at 17:28.
Pushed by lvsouza into branch 'master'.

Fix crash when parsing IPv6 configuration from dbus.

M  +24   -20   backends/NetworkManager/settings/ipv6dbus.cpp
M  +1    -1    plasma_nm_version.h

http://commits.kde.org/networkmanagement/e3ed3cb5b3e57ff427f5d64dec27add6b1f3f678

Git commit 89f6240d1c8d505930039684df80779fe4a68f96 by Lamarque V. Souza.
Committed on 12/02/2013 at 17:12.
Pushed by lvsouza into branch 'nm09'.

Accept upper case hexadecimal digits in SimpleIpV6AddressValidator.
(cherry picked from commit 332a1faee9daabe1c3275bfe4e04c2f5be340685)

M  +1    -1    libs/ui/simpleipv6addressvalidator.cpp

http://commits.kde.org/networkmanagement/89f6240d1c8d505930039684df80779fe4a68f96

Git commit 0c86d302fd4e60423de4d14c70845026db072bdd by Lamarque V. Souza.
Committed on 12/02/2013 at 17:28.
Pushed by lvsouza into branch 'nm09'.

Fix crash when parsing IPv6 configuration from dbus.

M  +24   -20   backends/NetworkManager/settings/ipv6dbus.cpp
M  +1    -1    plasma_nm_version.h

http://commits.kde.org/networkmanagement/0c86d302fd4e60423de4d14c70845026db072bdd

(In reply to comment #7)
> definitively in case we don't want ipv4 it must have a flag "unactivate in
> the ipv4 part of the networkmanager connection file according to do nothing
> and keep ipv4 settings for future use

Good to know that :-) I did not create that dialog so I did not remember there was an option to completely disable IPv4 there.
 
> P.S. i found errors about kcm-networkmanager in adding dns
> - it accepts only 2a01:5d8:e0ff::1
> - it don't accept address like 2A01:5D8:E0FF::1
> you can't write or past such address

I have just fixed that issue.
 
> the windows about to give root password to record a modification is always
> displayed behind the modification window, (rarely before)

Well, that is probably the polkit window, which Plasma NM does not have control of since it is NetworkManager itself that triggers it. Unfortunately forcing a dialog over other is not trivial in Xorg.

Marking this bug as invalid since the original report can be solved with a configuration change. If there is any other issue please fill in another bug report.

thanks