I'm looking for ideas and suggestions as to what could be the cause of slow download and upload rates after I moved to use my own router with a static IP address (ISP gateway running in bridged mode). To be clear, I'm on a symmetric 940Mbps link but I'm getting ~220Mbps Download and ~490Mbps upload.
I use a Linksys WRT3200ACM router running OpenWRT fully updated. My WAN is using a static IP address assigned by my ISP connecting to the WAN using PPPoE (Fiber to the premise). I'm using VLANs (tagged). I'm using NAT for my LAN (Firewall - Masquerading). I've also got SQM and DNS over HTTPS.
The symptoms were these:
When I moved from the ISP modem to the Linksys Router my Download/Upload rates went down by about 300Mbps.
After assigning the static IP address the download rate was cut about in half, upload is still the same.
I can only guess I've missed a configuration in either my firewall or routes which is causing unnecessary overhead but I can't figure out what am i missing.
Thanks in advance!