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ok issue is still happening even after setting the mtu.
even when using  https://inv.nadeko.net/ the video loads super slow at the star, but once its loaded and started everything is working ok

its a real ipv4, all other traffic works ok no real problems.
i set the MTU to be 1500 and up until now everything is working now. ill update again in a few hours to make sure that this was really the problem

im having trouble on all devices, but when switching to a different network (5g hotspot for example)
so when my phone and pc is on wifi youtube dosent work, when they are on 5g it does work

my isp only supports ipv4, ill try setting the mtu manually and see if there are any improvements.

i dont have any blocklist setup currently, this occurs on multiple devices (chrome, youtube app etc)

Hey folks,

I have an OPNsense router that has lately been causing me a lot of trouble. Whenever I'm browsing YouTube trying to watch videos, it takes a really long time to load and even pops up a "YouTube is offline" message.
I have diagnosed that the issue is coming from the network, as it happens to all devices (Wi-Fi and LAN). When using a cellular network on my phone or a hotspot, this doesn't happen.
My current setup is: ISP (FTTH) -> Router (SFP port - PPPoE) -> Main switch -> LAN + Wi-Fi.
I'm using Unbound on both Cloudflare and Google DNS, and Dnsmasq for DHCP. There are no VLAN definitions or anything configured to block traffic on the main LAN network.
I would really appreciate the help!