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Created attachment 515705 [details] /var/log/messages extract showing DHCP DISCOVERs despite explicitly disabling IPv4 Description of problem: When a connection defined in NetworkManager explicitly disables IPv4, DHCP DISCOVER packets are still transmitted Version-Release number of selected component (if applicable): NetworkManager-0.8.9997-5.git20110702.fc15.i686 How reproducible: Always Steps to Reproduce: 1. Open Network Connections (nm-connection-editor) 2. Remove all configurations for a specific interface (e.g. em1) from nm-connection-editor 3. Create a new connection profile by clicking "Add", e.g. named "No IPv4" 4. Enter the MAC address of the interface, deselect "Connect Automatically" 5. On the "IPv4 Settings" tab select "Disabled" from the "Method" list 6. Save the connection profile 7. Plug in an Ethernet cable 8. Enables the connection from the nm-applet icon, or select it from the list if more than one connection profile is defined for the interface (i.e. step 2 is skipped) Actual results: Once the connection is enabled, DHCP packets are transmitted on the interface Expected results: Absolutely no IPv4 traffic should originate on the interface. The interface config should have a link-local IPv6 address only Additional info: The bug is marked as High severity since it is explicitly the opposite of what should be observed. This configuration is useful for a passive traffic monitor, and any DHCP traffic would interfere with the operation of the observed network, so is unequivocally undesirable.
Created attachment 515706 [details] NetworkManager generated ifcfg script for No IPv4 connection
The problem is that you left IPv6 method as "Ignore". That's why when ifcfg-rh plugin reads the connection it sets IPv4 back to "Automatic (DHCP)"; because else there's neither IPv4 nor IPv6 connectivity. So please set IPv6 method to "Automatic", or edit the file to contain IPV6INIT=yes. Actually, there was a change upstream recently that makes "Automatic" as default IPv6 method when creating connections.
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