FAST_IPSEC(4)           NetBSD Kernel Interfaces Manual          FAST_IPSEC(4)

Fast IPsec -- hardware-accelerated IP Security Protocols
options FAST_IPSEC options IPSEC_NAT_T pseudo-device crypto
IPsec is a set of protocols, ESP (for Encapsulating Security Payload) AH (for Authentication Header), and IPComp (for IP Payload Compression Pro- tocol) that provide security services for IP datagrams. Fast IPsec is an implementation of these protocols that uses the opencrypto(9) subsystem to carry out cryptographic operations. This means, in particular, that cryptographic hardware devices are employed whenever possible to optimize the performance of these protocols. In general, the Fast IPsec implementation is intended to be compatible with the KAME IPsec implementation. This documentation concentrates on differences from that software. The user should refer to ipsec(4) for basic information on setting up and using these protocols. System configuration requires the opencrypto(9) subsystem. When the Fast IPsec protocols are configured for use, all protocols are included in the system. To selectively enable/disable protocols, use sysctl(8).
To be added.
ipsec(4), setkey(8), sysctl(8), opencrypto(9)
The protocols draw heavily on the OpenBSD implementation of the IPsec protocols. The policy management code is derived from the KAME implemen- tation found in their IPsec protocols. The Fast IPsec protocols are based on code which appeared in FreeBSD 4.7. The NetBSD version is a close copy of the FreeBSD original, and first appeared in NetBSD 2.0. Support for IPv6 and IPcomp protocols has been added in NetBSD 4.0. Support for IPSEC_NAT_T (Network Address Translator Traversal as described in RFCs 3947 and 3948) has been added in NetBSD 5.0.
There still are some issues in the IPv6 support. In particular FAST_IPSEC does not protect packets with IPv6 extension headers. Certain legacy authentication algorithms are not supported because of issues with the opencrypto(9) subsystem. This documentation is incomplete. NetBSD 5.0 April 24, 2007 NetBSD 5.0

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