To run IPsec through a NAT-Device based on the IETF
Requests for Comments (RFC) 3193 and version 2 of the
original IETF IPsec NAT-T Internet drafts. IPsec NAT-T
is currently specified in RFCs 3947 and 3948.
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Racoon supports NAT-T since ... a long ago. Use "./configure
--enable-natt" and properly configure racoon.conf (see
examples in the tarball).