I have a simple setup with a RV180W router (5 users, no domain, no AD, 1 VPN site-to-site).
Everything was working fine during about 1 year. Suddently, last week, internet browsing is slow or giving 404 error on computers.
You can try to load google (or any page) it give 404 error, you try it again it takes 3 minutes to load, you try it 5 sec after, it works.
I'm connected with Remote Desktop externally when doing my tests, the connexion is NOT dropping (while I experience 404 error) which makes me think of a DNS issue.
The router setup hasn't changed before the problem happens (no new computers, no firmware upgrade).
I was on 18.104.22.168 firmware so I tried to update it to the latest 22.214.171.124. That didn't resolve the issue and now i'm having the "100% CPU bug" that is stated in numerous other post. (which I don't care for now)
If I reboot the router, everything works fine for a couple of hours before failing again.
This is starting to look like an MTU issue. Perform an MTU test on a LAN PC:
1) Open the Command Prompt
2) ping 126.96.36.199 -f -l 1472 (You should get replies)
3) If you get good replies, the MTU of the WAN port is correct at 1500
4) If you see "Packet needs to be fragmented but DF set.", run the command again with MTU 1464 instead of 1472. If you get clean replies, try 1466, 1468, etc.
You are looking for the highest even number that gets replies instead of "Packet needs to be fragmented but DF set." Whatever that number is, add 28 to it and assign that number as the MTU on the WAN port.
Under Networking-> IPv6-> IP Mode, make sure it is set to IPv4-only unless you are using IPv6. I have seen Dual-Stack cause issues like you describe in some cases.
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