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This section lists and explains important directories and files used for configuring Openswan.
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/etc/ipsec.d - main directory. Stores Openswan related files.
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/etc/ipsec.conf - master configuration file. Further *.conf configuration files can be created in /etc/ipsec.d for individual configurations.
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/etc/ipsec.secrets - master secrets file. Further *.secrets files can be created in /etc/ipsec.d for individual configurations.
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/etc/ipsec.d/cert*.db - Certificate database files. The old default NSS database file is cert8.db. From Red Hat Enterprise Linux 6 onwards, NSS sqlite databases are used in the cert9.db file.
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/etc/ipsec.d/key*.db - Key database files. The old default NSS database file is key3.db. From Red Hat Enterprise Linux 6 onwards, NSS sqlite databases are used in the key4.db file.
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/etc/ipsec.d/cacerts - Location for Certificate Authority (CA) certificates.
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/etc/ipsec.d/certs - Location for user certificates. Not needed when using NSS.
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/etc/ipsec.d/policies - Groups policies. Policies can be defined as block, clear, clear-or-private, private, private-or-clear.
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/etc/ipsec.d/nsspassword - NSS password file. This file does not exist by default, and is required if the NSS database in use is created with a password.
This section lists some of the configuration options available, mostly written to /etc/ipsec.conf.
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protostack - defines which protocol stack is used. The default option in Red Hat Enterprise Linux 6 is netkey. Other valid values are auto, klips and mast.
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nat_traversal - defines if NAT workaround for connections is accepted. Default is no.
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dumpdir - defines the location for core dump files.
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nhelpers - When using NSS, defines the number of threads used for cryptographic operations. When not using NSS, defines the number of processes used for cryptographic operations.
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virtual_private - subnets allowed for the client connection. Ranges that may exist behind a NAT router through which a client connects.
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plutorestartoncrash - set to yes by default.
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plutostderr - path for pluto error log. Points to syslog location by default.
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connaddrfamily - can be set to either ipv4 or ipv6.
Further details about Openswan configuration can be found in the ipsec.conf(5) manual page.
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