interface in iOS

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lo = localhost
en = ethernet
ap = Probably for access point (if you are acting as a wifi host)

pdp_ip = maybe PDS data packet? PDS is the Phone Data Service, the data portion of GSM. Since there are four, I might postulate that PDS has the capability to offer four discrete channels

interface in iOS

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原文地址：http://www.cnblogs.com/iclk/p/4494874.html