I have recently managed to upgrade my home network to 400Mbps down (sweet) unfortunately my desktop does not seem to be achieving the full speeds (about only 150Mbps) the same desktop running Windows will achieve 400Mbps no problem on the same ethernet port
At first I believed this was a driver issue but I eventually set up an Iperf3 server internally and was able to achieve Gigabit speeds in both directions. This problem seems to be only affecting the WAN side not the LAN.
Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 26)
**~ >>> ethtool enp6s0** netlink error: No such file or directory Settings for enp6s0: Supported ports: [ TP MII ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Supported pause frame use: Symmetric Receive-only Supports auto-negotiation: Yes Supported FEC modes: Not reported Advertised link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Advertised pause frame use: Symmetric Receive-only Advertised auto-negotiation: Yes Advertised FEC modes: Not reported Link partner advertised link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Link partner advertised pause frame use: Symmetric Link partner advertised auto-negotiation: Yes Link partner advertised FEC modes: Not reported Speed: 1000Mb/s Duplex: Full Port: MII PHYAD: 0 Transceiver: external Auto-negotiation: on Cannot get wake-on-lan settings: Operation not permitted Current message level: 0x00000033 (51) drv probe ifdown ifup Link detected: yes