Failover back on FWA510 fails

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Zilversurfaren
Zilversurfaren Posts: 4  Freshman Member
First Comment
in Mobile Broadband

Hi!

Using a FWA510 running firmware V1.18(ACGD.5)CO. Primary WAN is Ethernet (fiber) and secondary WAN Cellular (SIM card). When primary fails secondary kicks in and works nicely. However, when primary returns the secondary fails to go back, and is stuck until I reboot. Any ideas?

Thanks.

Zilversurfaren

Accepted Solution

  • PeterUK
    PeterUK Posts: 3,893  Guru Member
    100 Answers 2500 Comments Friend Collector Seventh Anniversary
    edited July 23 Answer ✓

    You need to enable this

    Screenshot 2025-07-23 142752.png

    However there is a problem with it it seems due to the way it check ping out Ethernet which I will post about but I have another way of doing failover.

    So heres what happens ping to 8.8.8.8 is fine you go out Ethernet then ping fails and you go out Cellular then when ping is successful again you go out ethernet all seems good right? well no

    So in short what the connection check is set too forces all traffic that was going out Cellular to test Ethernet and will check for the number of check fail limit then if on reply to ping goes back to Cellular meaning their is a interruption as ping checks out ethernet so the only bad workaround is set connection check high and check fail limit low.

All Replies

  • PeterUK
    PeterUK Posts: 3,893  Guru Member
    100 Answers 2500 Comments Friend Collector Seventh Anniversary
    edited July 23 Answer ✓

    You need to enable this

    Screenshot 2025-07-23 142752.png

    However there is a problem with it it seems due to the way it check ping out Ethernet which I will post about but I have another way of doing failover.

    So heres what happens ping to 8.8.8.8 is fine you go out Ethernet then ping fails and you go out Cellular then when ping is successful again you go out ethernet all seems good right? well no

    So in short what the connection check is set too forces all traffic that was going out Cellular to test Ethernet and will check for the number of check fail limit then if on reply to ping goes back to Cellular meaning their is a interruption as ping checks out ethernet so the only bad workaround is set connection check high and check fail limit low.

  • Zilversurfaren
    Zilversurfaren Posts: 4  Freshman Member
    First Comment

    Thanks PeterUK.

    I do have the WAN Backup enabled, but will check your suggestion with a high interval and low fail limit.

    image.png
  • Zilversurfaren
    Zilversurfaren Posts: 4  Freshman Member
    First Comment

    Awesome PeterUK. Your suggestion with interval 60 and fail limit 1 did solve my issue. Can go back and forth between ethernet and cellular now. Many thanks!

  • PeterUK
    PeterUK Posts: 3,893  Guru Member
    100 Answers 2500 Comments Friend Collector Seventh Anniversary
    edited July 25

    I posted a case with support to see about the problem I found.

    What I found that happens is every interval check (60 secs) by fail limit (1 sec) there is a 5 secs move from Cellular to Ethernet even if Ethernet is down by my checking which is Ethernet up and ARP is up but ping fails.

    But if Ethernet is up and ping ok all is fine its just the fail over of ethernet that's the problem

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