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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 ?

Category: Mid Range Firewalls

Best Answers

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    TKWITSTKWITS Community Legend ✭✭✭✭✭
    Answer ✓

    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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    ArkwrightArkwright All-Knowing Sage ✭✭✭✭
    Answer ✓

    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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    TKWITSTKWITS Community Legend ✭✭✭✭✭
    Answer ✓

    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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    Master_CraneMaster_Crane Newbie ✭
    Answer ✓

    Thanks that answers my question


  • Options



    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 ?

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