simple questions about net/ipv4; kara_am

[am kara]

What are the general functionalities of
net/ipv4/tunnel4.c and  net/ipv4/ipip.c?

Are these modules necessary and compulsory to
implement IPsec by Linux kernel? I mean if I do not
load them I can not make IPsec , layer 3 between two
points of a network?




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