AC800M has the possibility to configure only one gateway.
We have two redundant networks, each one has their own gateway.
How AC800 handle two different networks with the same gateway?
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Having two default gateways is not always the best. If Metric (path cost) is equal, default routing may not always work good.
Instead, use the RNRP Router To Ext Netw1 and RNRP Router To Ext Netw2 settings.
When set, RNRP will monitor the status of these two gateways and during normal operation use #1 (with failover to #2 when needed).
These gateways may, but does not have to run RNRP (if not, the controller will fall back to use regular "ping" to monitor availability).
A benefit of using RNRP Router To Ext Net1 even if only a singular router exists is that the setting can be made and effectuated using a Warm Download while using the traditional static Default Gateway setting require a Controller Reset to go into effect.
E.g. if the default gateways are 172.16.80.21 and 172.16.80.22, both with redundant connection, set the following values:
RNRP Router To Ext Netw1: 172.16.80.21
RNRP Router To Ext Netw2: 172.17.80.22
If the controller's primary path is lost, the redundant router must be pointed out via its secondary IP address.
The RNRP Ext Network & Mask settings can be used to restrict the default route. With 0.0.0.0/0.0.0.0, any not local IP address will be routed via the router(s).
By declaring RNRP Ext Network 172.16.0.0 and RNRP Ext Net Mask 255.254.0.0, only the 172.16.0.0 and 172.17.0.0 subnets will be reachable.