I have a TP-Link Archer C2 AC750 v1.1 running OpenWrt 22.03.3, r20028-43d71ad93e; my ISP gives 1 Gbps connection.
I previously had a router (Zyxel VMG-8924 B10D) supplied by the ISP, but it sucks so I want to use another one with OpenWrt running instead, I had this archer lying around so I wanted to try.
I first tried to setup a WAN connection on stock rom, but couldn't do that successfully: the only thig to setup is a PPPOE connection with a 835 vlan on the wan port.
So I flashed OpenWrt on the device and setup the connection as stated above, but this is what happens: when running speed tests download speed caps around 100 Mbps and upload speed caps at 170 Mbps (why 170??? if it was 100 Mbps I could have imagined that for some reason the link is established as 100BaseTX)
PCs connect to the device with Cat.6A cable to LAN port 1, and links are in 1000BaseT full-duplex, LAN communication (cable to cable) goes smoothly at around 700 Mbps.
WAN link in luci switch page is 1000BaseT full-duplex as well, but as you can see from the screenshot speed is capped.
Why WAN caps speed?
So here are a couple of things I tried to verify:
- Cables: tried switching ports, changing cables, no difference
- Ports: tried tagging VLAN 835 to another port, no difference
- Routing/NAT Offloading: Flagged software flow offloading and hardware flow offloading in Network/Firewall page, maybe some difference
- Installed ethtool, but for some reason doesn't work: whenever I pass an interface as argument I either get "No data available" or "No such device" message result
dmesg | grep eth returns the following
root@OpenWrt:~# dmesg | grep eth [ 1.090166] mtk_soc_eth 10100000.ethernet: port 5 - using fixed link parameters [ 1.097924] mtk_soc_eth 10100000.ethernet: loaded mt7620 driver [ 1.104771] mtk_soc_eth 10100000.ethernet eth0: mediatek frame engine at 0xb0100000, irq 5 [ 9.203125] mtk_soc_eth 10100000.ethernet eth0: port 5 link up (1000Mbps/Full duplex) [ 9.212005] 8021q: adding VLAN 0 to HW filter on device eth0 [ 11.363866] mtk_soc_eth 10100000.ethernet eth0: port 5 link down [ 43.876604] mtk_soc_eth 10100000.ethernet eth0: port 5 link up (1000Mbps/Full duplex) [ 43.885134] 8021q: adding VLAN 0 to HW filter on device eth0 [ 43.923894] br-lan: port 1(eth0.1) entered blocking state [ 43.929521] br-lan: port 1(eth0.1) entered disabled state [ 43.935437] device eth0.1 entered promiscuous mode [ 43.940403] device eth0 entered promiscuous mode [ 44.003022] br-lan: port 1(eth0.1) entered blocking state [ 44.008622] br-lan: port 1(eth0.1) entered forwarding state
root@OpenWrt:~# cat /sys/class/net/eth0.835/speed cat: read error: Invalid argument
I'd appreciate any help you can give, thanks