VPN keep-alive packets determine whether
a given path is reachable for an ION device. VPN keep-alive packets
are sent at a fixed interval on a VPN link. The VPN link is declared
down, if the peer is unreachable after a certain number of attempts
and a certain period of time.
The location of the ION device in a network topology plays an
important role in configuring VPN keep-alives. For example, you need
to configure a higher value of the keep-alive Interval between two
ION devices behind routers as compared to the keep-alive Interval
between two ION devices not behind routers.
VPN keep-alives are configured at the following levels: