I'm interested in the `ikev2` option in `ipsec.conf`. What is its primary purpose, and what are the accepted values? Additionally, I've heard about IKEv1 being disabled by default. When was IKEv1 disabled by default in Libreswan, and what is the recommended alternative for new deployments?
Navigate to 'libreswan.org'. Click on the 'Documentation' link. Click on the 'All Manual pages' link. On the 'All Manual pages' (libreswan man page), locate and click the link for 'ipsec.conf (5)'. Search for the `ikev2` option within the `ipsec.conf` manual page and extract its purpose and accepted values. Navigate back to the main documentation page or the Libreswan homepage to find information about IKEv1 deprecation or changes. Look for 'News' or 'Release Notes' sections on the website. Identify the specific release or date when IKEv1 was disabled by default. Determine the recommended alternative for new deployments based on the documentation. Synthesize all collected information into a concise answer.
The agent successfully navigates to the `ipsec.conf(5)` manual page and the relevant section for `ikev2`. The agent states that the `ikev2` option specifies whether IKEv2 is enabled for the connection. The agent lists the accepted values for `ikev2` as `insist`, `propose`, `permit`, `no`, and `never`. The agent successfully finds information about IKEv1 being disabled by default. The agent states that IKEv1 was disabled by default in Libreswan 4.0. The agent states that IKEv2 is the recommended alternative for new deployments.