Add Dead Peer Detection options to IPSec

[rdavies@…]

IPSec when it loses communication with the other end will not restablish the connection without human intervention.

Adding DPD (Dead Pear Detection) options to the IPSec module would overcome this.

For example, i have a postsetconf script to add these options to my connections:

        dpddelay=30
        dpdtimeout=120
        dpdaction=restart

Would be really helpful if these options were configurable per connection on the GUI rather than resorting to a script to do this.