Network conflicts

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http://www.ubuntux.org – What are the various network managers that can be present on ubuntu? I think that I have more than one that is conflicting with the other. The problem I can set my eth0 card to have a fixed IP address with nm-connection-manager, yet when I use the applet NetworkManager to connect to eth0, it gets an address from DHCP, and doesn't use the fixed IP address that I gave it. I did have wicd installed at one point, but used synaptic to remove it with the "complete removal" setting. Any idea as to where this conflict is arising? (Distributions)