Tuning: Standard
Best Results: bridge pickup, fuzzbox at low attack & medium level
I have only heard the main riff Page does for this song but it makes up most of the song 
so here it is.

E|-----------------------|
B|-----------------------|
G|-----------------------|
D|-----------------------|
A|-----------------------|
E|-5-3-0-3-4-5-3-0-3-4-5-| and repeat

Play each note very distinctly and hard. Fuzzbox will help greatly. Anyways, one of the 
lost riffs of Page's era with the Yardbirds.