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Question is straight forward enough: where does the loopback stack reside in linux, and to a lesser necessity, windows? In linux it appears to be a kernel driver, but I don't know where to look to find it in the kernel memory or source. It seems to be interconnected with everything due to the ties to all services.

NationWidePants
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The loopback interface is a driver, therefore it is found in the drivers subtree of the Linux source. See drivers/net/loopback.c.

user1110743
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