Mac OSX Yosemite on Mac Mini, self assigned ip address

I have had a situation where I cannont access the inteet and the network preferences list etheet interface connected to DSL modem has self assigned ip address and cannot connect. It is set to connect via dchp

I googled this problem and the instruction was to remove a file called com.apple.alf.plist from /Library/Preferences and then reboot.

I did this and the interface to the DSL shows that it is connected but I still cannot get to remote sites.

One probable cause of the (dchp) self assigned ip address issue was a system up grade or a crash or other significant event. For this there has been nothing like that.

I have been playing with the etheet cables and now the preferences list the interface as having a self assigned ip address again.

Any thought, suggestions, info Thanks for time and attention

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