Same as nemarona, but I also uninstalled Network-Manager and kde network helper apps (I don't remember exactly which ones were installed - I removed all). Hand-editing both files gave me the desired static IP, and it remained fixed even after reboots.
Same as nemarona, but I also uninstalled Network-Manager and kde network helper apps (I don't remember exactly which ones were installed - I removed all). Hand-editing both files gave me the desired static IP, and it remained fixed even after reboots.