Internet Key Exchange version 2 (IKEv2)
iked is an Internet Key Exchange (IKEv2)
daemon which performs mutual authentication and which establishes and
maintains IPsec flows and security associations (SAs) between the two
The IKEv2 protocol is defined in RFC 5996, which combines and
updates the previous standards: ISAKMP/Oakley (RFC 2408), IKE (RFC 2409),
and the Internet DOI (RFC 2407).
iked only supports
the IKEv2 protocol; support for ISAKMP/Oakley and IKEv1 is provided by
iked supports mutual authentication using
RSA or ECDSA public keys and X.509 certificates. See the
AUTHENTICATION section below and PKI AND CERTIFICATE AUTHORITY COMMANDS
in ikectl(8) for more information about creating and maintaining the
public key infrastructure.
The options are as follows:
- Disable automatic blocking of IPv6 traffic. By default,
ikedblocks any IPv6 traffic unless a flow for this address family has been negotiated. This option disables VPN traffic leakage prevention on dual stack hosts (RFC 7359).
- Define macro to be set to value on the command line. Overrides the definition of macro in the configuration file.
- Do not daemonize and log to stderr.
- Use file as the configuration file, instead of the default /etc/iked.conf.
- Configtest mode. Only check the configuration file for validity.
ikedin passive mode. See the
set passiveoption in iked.conf(5) for more information.
- Disable NAT-Traversal and do not propose NAT-Traversal support to the peers.
- Enforce NAT-Traversal and only listen to NAT-Traversal messages. This option is only recommended for testing; the default is to negotiate NAT-Traversal with the peers.
- Produce more verbose output.
PUBLIC KEY AUTHENTICATION
It is possible to store trusted public keys to make them directly
iked, bypassing the need to use
certificates. The keys should be saved in PEM format (see
openssl(1)) and named and stored as follows:
- For IPv4 identities:
- For IPv6 identities:
- For FQDN identities:
- For UFQDN identities:
Depending on the
dstid specifications in
iked.conf(5), keys may be named after their IPv4 address, IPv6
address, fully qualified domain name (FQDN) or user fully qualified domain
iked can authenticate using
the pre-generated keys if the local public key, by default
/etc/iked/local.pub, is copied to the remote gateway
and the remote gateway's public key is copied to the local gateway as
course, new keys may also be generated (the user is not required to use the
pre-generated keys). In this example,
dstid would also have to be set to the specified
- The default
- The directory where CA certificates are kept.
- The directory where IKE certificates are kept, both the local certificate(s) and those of the peers, if a choice to have them kept permanently has been made.
- The directory where CRLs are kept.
- The directory where local private keys used for public key authentication are kept. The file local.key is used to store the local private key.
- The directory in which trusted public keys are kept. The keys must be named in the fashion described above.
- The default
iked.conf(5), ikectl(8), isakmpd(8)
C. Kaufman, P. Hoffman, Y. Nir, and P. Eronen, Internet Key Exchange Protocol Version 2 (IKEv2), RFC 5996, September 2010.
iked program first appeared in
iked program was written by