Implementing High Availability

State Synchronization is a very important component for implementing High Availability. Without it, other firewalls that may be called in to take over will not know the current status of connections and will cause a break in connectivity. However, State Synchronization is not the only piece to this equation. Another component must be involved to allow other routers or hosts around the firewall to know which firewall to use at the time. Dynamic routing protocols can certainly be used to achieve this, but this is not always practical and comes with its own problems—namely, these protocols can create asymmetric routing.

All HA solutions for FireWall-1 provide for some sort of virtual IP address, which is shared between ...

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