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Asymmetric MTU (1492 inbound/ingress; 1434 outbound/egress)? | VDSL2

I've been trying to deal with an issue that's been confounding me for the past year or so, in the quest to find any potential fix my horrendous online gaming experiences. Thus, I've drilled down to improper MTU settings as a possible source of my suffering. I seem to auto-negotiate some weird MTU values with my service. Based on many tests, the LetMeCheckIt site, and OpenWRT pppoe-wan logs, my inbound/ingress MTU seems to be 1492. My outbound/egress MTU seems to be 1434. Is this normal? Should I set both inbound and outbound to 1434? Or leave inbound at 1492, and set the client device (PC/PlayStation) to 1434? Somewhat interesting is, the Actiontec F2250 gateway Frontier gave me, if I run it as a combo router/modern, I'm unable to change any MTU settings. The inbound MTU is stuck at 1492 when using the F2250 as a router. With my OpenWRT router, I can make more adjustments, including changing the WAN-side MTU (ingress/inbound). I can even manually override the default-negotiated outbound/egress MTU. Like I said, it normally defaults to 1434, but I can up it to 1492 manually deep in the OpenWRT settings, with seemingly no ill-effects (no extra lag, no fragmentation in testing). This is all very confusing. I just want to figure out what the proper MTU settings are that I should be using, in order to avoid as much problems, undue lag, and fragmentation, as I possibly can. Adding to the confusion, doing the Netalyzer online diagnostic test, there seems to be a hop in my path MTU that is acting as a bottleneck (blackhole?). Basically, this hop is near my home, and is apparently bottlenecking my MTU to 552. Not sure what this means, how it affects me, or whether the test result is even accurate. I have 20/1 VDSL2+ in the south Sac area.

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