How to do it...

To configure ike-scan follow the given steps:

1. Browse to the directory where ike-scan is installed.
2. Install autoconf by running the following command:

        apt-get install autoconf

1. Run autoreconf --install to generate a .configure file.
2. Run ./configure.
3. Run make to build the project.
4. Run make check to verify the building stage.
5. Run make install to install ike-scan.
6. To scan a host for an aggressive mode handshake, use the following commands:

        ike-scan x.x.x.x -M -A

The following screenshot shows the output for the preceding command:

1. Sometimes we will see the response after providing a valid group name like (vpn):

        ike-scan x.x.x.x -M -A id=vpn

The following screenshot shows the example of the preceding command: