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ike-scan discovers IKE hosts and can also fingerprint them using the retransmission backoff pattern.
ike-scan can perform the following functions:

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• Discovery Determine which hosts in a given IP range are running IKE. This is done by displaying those hosts which respond to the IKE requests sent by ike-scan.
• Fingerprinting Determine which IKE implementation the hosts are using, and in some cases determine the version of software that they are running. This is done in two ways: firstly by UDP backoff fingerprinting which involves recording the times of the IKE response packets from the target hosts and comparing the observed retransmission backoff pattern against known patterns; and secondly by Vendor ID fingerprinting which compares Vendor ID payloads from the VPN servers against known vendor id patterns.
• Transform Enumeration Find which transform attributes are supported by the VPN server for IKE Phase-1 (e.g. encryption algorithm, hash algorithm etc.).
• User Enumeration For some VPN systems, discover valid VPN usernames.
• Pre-Shared Key Cracking Perform offline dictionary or brute-force password cracking for IKE Aggressive Mode with Pre-Shared Key authentication. This uses ike-scan to obtain the hash and other parameters, and psk-crack (which is part of the ike-scan package) to perform the cracking.

You can download ike-scan here:
master.zip
Or read more here.

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