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PIX515-UR got two net card, outside ip: o1.o2.o3.o4,inside ip: i1.i2.i3.i4, PAT is enable, outside interface's ip is used by PAT. and an internal WEB server's IP: w1.w2.w3.w4, it is the same subnet with i1.i2.i3.i4, and static map on PIX: s1.s2.s3.s4...