Netgate SG-1000 microFirewall

Author Topic: Monitor is FALSE detecting one of my WANs as DOWN and another WAN as UP  (Read 618 times)

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Offline dims

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Re: Monitor is FALSE detecting one of my WANs as DOWN and another WAN as UP
« Reply #30 on: January 04, 2018, 03:16:12 pm »
exactly if the monitors are going out bad and not getting a response
Why this can happen? Taking into consideration, that normal `ping` works?

Offline Derelict

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Re: Monitor is FALSE detecting one of my WANs as DOWN and another WAN as UP
« Reply #31 on: January 04, 2018, 03:24:25 pm »
Only your ISP can tell you why sent echo requests are not responded to.


Set all of those settings back to the default. Does it work?

If not, take a quick packet capture for posting here then try setting the data payload to 2. Does it work?

If not, take a quick packet capture for posting here then try setting the data payload to 64. Does it work?

If not, take a quick packet capture for posting here then post all of the above.
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Offline dims

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Re: Monitor is FALSE detecting one of my WANs as DOWN and another WAN as UP
« Reply #32 on: January 04, 2018, 03:35:38 pm »
Only your ISP can tell you why sent echo requests are not responded to.
How provider can technically distinguish pings from ping command and from dpinger?

Offline Derelict

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Re: Monitor is FALSE detecting one of my WANs as DOWN and another WAN as UP
« Reply #33 on: January 04, 2018, 04:10:56 pm »
The payload size of a normal ping from the ping command is 56 bytes. The payload size of a dpinger ping is 0 by default.

Hence why I asked you to do what I did.

It's pretty rare but some devices freak out with the 0-byte payload even though it's completely legal.
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Use this diagram to describe your issue.
The pfSense Book is now available for just $24.70!
Do Not PM For Help! NO_WAN_EGRESSTM

Offline dims

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Re: Monitor is FALSE detecting one of my WANs as DOWN and another WAN as UP
« Reply #34 on: January 05, 2018, 12:44:06 am »
Setting payload to 56 immediately made monitor think gateway is up, thank you!

I have set it to 56 in other monitors, and picture also became better: now zeros in RTT and RTTsd columns!

Offline dims

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Re: Monitor is FALSE detecting one of my WANs as DOWN and another WAN as UP
« Reply #35 on: January 05, 2018, 12:45:57 am »
No, last statement was wrong: after some time these columns got some positive values.

Offline pwood999

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Re: Monitor is FALSE detecting one of my WANs as DOWN and another WAN as UP
« Reply #36 on: January 05, 2018, 10:41:40 am »
I had flase GW down reports when I first configured multi-wan.  Then changed Monitor IP's from google to OpenDNS, and problems went away.   

Also this gives RTT & RTTsd figures which are probably more realistic for internet connectivity, rather than using the next-hop provider IP.

DSL GW = 7.5mS & 0.2mS
Cable GW = 15mS & 3.5mS

Cable is always longer due to the way Docsis works !!