@dennypage said in Bufferbloat issue when using ipv4 and ipv6:

Assuming that the hosts in your LAN are at the same speed as your WAN connection (all 1Gb), I have an experiment to suggest...

Change your floating rule such that you are only assigning a limiter to the upload side, like so:

and then re-test. Does your grade change or remain the same?

Sorry Denny, I thought I had replied to your suggestion at the time. I set FQ_CoDel on download through experimentation but mindful that setting it on upload only is common. It did improve my latency / buffurbloat under load and with tuning I found a good balance between latency and the small decrease in bandwidth. I experienced the same on 2 different routers previously but both of them did not have the CPU power to run download FQ-CoDel at high bandwidths - this is one of the reasons I moved to pfSense.

The downlink from pfSense to my production LAN & VLAN runs at 10 GbE, as do my switches and a number of servers and hosts, so typically at greater bandwidths than my nominal 1 GbE WAN connection. I am not sure my config is what you seek for your experiment but still happy to tweak & test it for you, if you would still like some data?

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