With Failover and Load Balancing do both the WAN interfaces have to use the same Probing method?
I can see on a customer's firewall
X1 interface uses Logical Probing
X2 interface uses Physical Probing
The Main and Alternate Targets are Alive for X1
But shows as Disabled on X2 .
In a situation when X1 goes down.
Will this affect failover if this fails to X2 and then the X1 interface comes back up ?
Best Answers
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TKWITS Community Legend ✭✭✭✭✭
To answer the subject line: No, they don't have to use the same probing.
A more specific question in the body would help, but what would happen depends on the Failover configuration in place (Active/Passive, Round Robin, etc.) and you have not provided that information.
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Arkwright All-Knowing Sage ✭✭✭✭
Logical probing is better because it covers you for a failure further upstream in your ISP's infrastructure. Having it enabled on your backup WAN is still useful because it will log the state of that WAN, giving you information on how reliable that WAN is, that you might not otherwise be aware of with it only being a backup.
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TKWITS Community Legend ✭✭✭✭✭
Arkwright is correct about the benefits of Logical Probing over Physical.
To answer the question posed: "can that cause it to not failback to X1 when that comes back up ?"
It shouldn't but it depends on the settings (again not enough information was provided).
"Basic Active/Passive Failover - The multiple WAN interfaces use ‘rank’ to determine the order of preemption when the Preempt checkbox has been enabled. Only a higher-ranked interface can preempt an Active WAN interface."
Thus if X1 is configured with a higher 'rank' than X2 and you have preempt enabled, having Physical Probing enabled on X2 would not prevent the Sonicwall from 'failback' to X1 as the active WAN interface.
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TKWITS
Its using Active/Passive
X1 - Primary - Logical Probing
X2 - Back up - Physical Probing
I noticed that they were set up different and wondered if that'd affect failover
If it fails to backup which uses Manual Probing, can that cause it to not failback to X1 when that comes back up ?