gateway monitoring issue

[alireza_salehi]

Hi
I configured pfsense 2.4.4-RELEASE-p1 for dual wan scenario,

i have two dsl modems and dsl gateway ip set for pfsense monitor ip for each pfsense gateway.

but when there is a download going on one gateway ,that gateway goes down because of network latency!
if i set the monitor ip to dsl modem itself, monitoring service cannot detect internet connectivity, and if i set monitoring ip to dsl gateway or some public dns or ip then it goes down because of latnecy,

is there a fix to this or better solution to monitor internet connectivity?

[Rico]

With very high bufferbloat you will have other problems then only gw monitoring issue as well.
You can try the CoDel Scheduler, @jimp did a very short but good topic for CoDel, check it out here: https://www.netgate.com/resources/videos/pfsense-244-short-topics.html
You can jump right in at 6:15 min.

-Rico

[pwood999]

I use two OpenDNS IP addresses as gateway monitoring. Originally I tried the Modem IP and Google DNS but in both cases the monitoring was not great. With opendns it seems to work much better.

OpenDNS server addresses, 208.67.222.222 and 208.67.220.220 for GW 1 & 2 respectively.

[alireza_salehi]

this is not fixed my problem , pfsense multi-wan not working well , switching between wan connections and lots of latency and packet loss are more when in single wan mode , when using each wan in a single wan mode there are much less latency and packet loss and down time.
i tried a lots of configurations with no success and everybody has complaints about internet down time after multi wan enabled.

[alireza_salehi]

@pwood999

i tried google/ opendns / cloudflare dns for monitoring but there isn't much diffidence between them. problem not solved even with buffer bloat solution provided here.

[alireza_salehi]

@Rico
Hi , I have tested this approach and configured CoDel Scheduler and used it for a while and tried diffrent combination of it's options but the mai nproblem is that is causes web access slowness on entire clients, no body can use internet correctly, some websites not opening right a way and take a long time to load but as soon as we disable schedulers every thing is ok!

i think configuring scheduler and CoDel and Queues needs some advanced expertise. guidelines provided in the video and pfsense docs not enough to use them, at least for me.