Yes you can!
Tunnel parameter settings are available on page 32-33 of the configuration document - https://s3.amazonaws.com/cohesive-networks/dnld/Cohesive-Networks_VNS3-4.4.x-Configuration-BYOL.pdf
Example parameters:
phase1=aes256-sha1-dh5
phase2=aes256-sha1
pfsgroup=dh5
phase1-lifetime=28800s
phase2-lifetime=3600s
Watch a full rundown of IPsec parameters in VNS3 and how to edit custom parameters for extra configuration settings:
[Watch on YouTube: https://youtu.be/ulQMx9qyDRg]