pfSense+ MultiWAN False reporting of Monitor IP down

KB8DOA

pfSense+
I have a SG-5100 (running v25.07.1) where:
MultiWAN

WAN2
Status: Danger, Packetloss

Even though I can go to
Diagnostics,PING
Select that interface (WAN2)
and am able to Ping everything okay
including the Monitor IP Address for that Gateway...

I have to now set
Disable Gateway Monitoring Action
so that I can use that interface

Have tried restarting dpinger service
still having problem

Can anyone advise on what this could be?

w0w

@KB8DOA
Did you set monitoring IP under Routes WAN2 gateway?

KB8DOA

@w0w
Yes I did:

Bob.Dig

@KB8DOA Maybe it is already used or whatever. Try a different IP-address.

KB8DOA

@Bob.Dig

Does not matter which PINGable IP Address I use, same problem.

w0w

@KB8DOA
Has this configuration ever worked properly at all? And what was done that made it stop working?

tman222

Hi @KB8DOA - From the screenshot you posted above, I assume you have T-Mobile 5G Home Internet running on WAN2? If so, I ran into similar issues recently. Under Advanced settings for your WAN2 gateway, try increasing the Data Payload parameter from the default value of 1. For T-Mobile Home Internet I believe 4 was the minimum value that worked for me, but you can choose a larger size as well. This is likely also the reason that regular pings succeeded through Diagnostics/Ping as these ping probes use 56 bytes of data by default vs. dpinger's 1.

https://docs.netgate.com/pfsense/en/latest/routing/gateway-configure.html#advanced-gateway-settings

Hope this helps.

KB8DOA

@w0w said in pfSense+ MultiWAN False reporting of Monitor IP down:

@KB8DOA
Has this configuration ever worked properly at all? And what was done that made it stop working?

It works sometimes,
then all the sudden stops working.

I have just tried increasing the "weight" to 4,
per @tman222 suggestion.

I hope this resolves it...