Penguin
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IPSec on IPv4 on Linux 2.4.

See http://vpn.ebootis.de/ for Windows interconnection information.

!!FreeSwan Notes
Starting FreeS/WAN IPsec U2.01/K1.96... /usr/lib/ipsec/eroute: pfkey write failed, returning -1 with errno=22. Invalid argument, check kernel log messages for specifics.

pfkey has changed between 1.96 and 2.x - upgrade your kernel IPSEC support to 2.x or higher