jason@jw:~$ grep "IPSEC" /sys/conf/NOTES
# In order to enable IPSEC you MUST also add device crypto to
options IPSEC #IP security (requires device crypto)
#options IPSEC_DEBUG #debug for IP security
# Set IPSEC_FILTERTUNNEL to change the default of the sysctl to force packets
# IPSEC history is preserved for such packets, and can be filtered
#options IPSEC_FILTERTUNNEL #filter ipsec packets from a tunnel
# Set IPSEC_NAT_T to enable NAT-Traversal support. This enables
options IPSEC_NAT_T #NAT-T support, UDP encap of ESP
# TCP sessions (e.g. BGP) where IPSEC is not available nor desirable.
# This requires the use of 'device crypto', 'options IPSEC'
# configuring IPSEC and when you have a h/w crypto device to accelerate

Может быть, поэтому?

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