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one_co_il
one_co_il
New Member
December 13, 2018
Question

Detect Non Stable WAN with Link monitor

  • December 13, 2018
  • 1 reply
  • 4803 views

Hi

I setup Link monitor for redundant Wan connections. It's working great when WAN line is down 

but if a WAN line is not stable and getting 40% packet lost its not taking it down.

probably because its not getting 3 bad ICMP in a row

is there an other setting that i can configure for detecting non stable Connection?

    1 reply

    Toshi_Esumi
    SuperUser
    Toshi_Esumi
    SuperUser
    December 13, 2018

    There might be something different in SD-WAN config to specifically detect packet losses, which I'm not familiar with. But again it would be likely using the same ping mechanism the link-monitor uses.

    If the packet loss rate is consistently 40%, the probability is your link-monitor ping packets would be lost 40% as well. In reality those drops don't happen exactly in the same sequence all the time like !!!!!!....!!!!!!....!!!!!!!....(18 successes/12 failures) and so on. But likely something like !!..!!.!!..!!!.!!!!....!!..!!!(18 successes/12 failures).

    I think you can adjust the interval shorter from the default 5 sec, and less failtime from the default 5 times to catch those failures to trigger a failover. Most difficult part is you can't test until 40% packet loss ready happens.

     

    neonbit
    neonbit
    New Member
    December 14, 2018

    SD-WAN is the way to go, you can create a SLA rule to say if ping drops are less than 40% then goto secondary link.

    one_co_il
    one_co_ilAuthor
    New Member
    December 16, 2018

    neonbit wrote:

    SD-WAN is the way to go, you can create a SLA rule to say if ping drops are less than 40% then goto secondary link.

    It seems that the Link status configuration of SD-WAN are the same as Link monitor

    ICMP fail for X times at X intervals  

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