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rosdep init doesn't need a network connection. It's just a convenience method to add the default rosdep sources.

rosdep update downloads the sources and puts them into your rosdep cache. You simply need to copy ~/.ros/rosdep/sources.cache from a machine which has been updated onto the machine which has not yet.

Alternately you could copy all the source files onto your local harddrive and change the sources.list file to point to the file:/// url then rosdep update will work w/o network, but won't update when external systems update.