I am not a programmer, but I would like to suggest an approach to
fail over for pfSense interfaces.
Requirements:
1. Universal protocol usage (IP-based).
2. User can set resolution (frequency of checking for failure in
seconds).
3. User can set sensitivity (milliseconds of lack of response until
failure is declared).
4. User can set resolution and sensitivity to fail back.
5. User can set if fail-back takes place (similar to VRRP pre-empt
mode).
How this might work:
Use ping to check availability of active and in-active connections
according to user settings.
Change interface alias or pf config to point to new interface/gateway
when a failure is detected.
If user specified, automatically switch back when primary interface
is within parameters.
Else User must go to web interface and manually switch back.
Caviat: If user switches back to primary when it is still outside
parameters, it will just fail-over again.
Park
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