December 22, 2025Dec 22 Hi,I just put a Intel X550-T2 card in my server - switched it to eth0 and rebooted and can connect OK.However the NIC is only detected at 1Gb. I was going for 2.5Gb as that is what my new switch (Unifi cloud gateway Fiber) supports (connected by about 50ft of Cat6).I've read about issues with 2.5Gb and the need to force this speed? here is current status:root@TOWER:~# ethtool eth0Settings for eth0: Supported ports: [ TP ] Supported link modes: 100baseT/Full 1000baseT/Full 10000baseT/Full 2500baseT/Full 5000baseT/Full Supported pause frame use: Symmetric Supports auto-negotiation: Yes Supported FEC modes: Not reported Advertised link modes: 100baseT/Full 1000baseT/Full 10000baseT/Full Advertised pause frame use: Symmetric Advertised auto-negotiation: Yes Advertised FEC modes: Not reported Speed: 1000Mb/s Duplex: Full Auto-negotiation: on Port: Twisted Pair PHYAD: 0 Transceiver: internal MDI-X: Unknown Supports Wake-on: d Wake-on: d Current message level: 0x00000007 (7) drv probe link Link detected: yesany suggestions on how to connect it at 2.5 ?thanks,
December 22, 2025Dec 22 Community Expert 13 minutes ago, chuga said:Advertised link modes: 100baseT/Full1000baseT/Full10000baseT/FullThe NIC is not advertising 2.5 and 5GbE support, not sure if it's a driver or other limitation. Google or ChatGPT may help.
December 22, 2025Dec 22 Author *updated. Via user script plugin I created a script with these lines and set it to run when array starts for the first time.hope this helps if anyone else has the same issue:root@TOWER:~# ethtool -s eth0 autoneg offroot@TOWER:~# ethtool -s eth0 speed 2500 duplex fullI found a suggestion that may have worked. How can I make this persistent after reboot? I'm not sure what file to modify.root@TOWER:~# ethtool -s eth0 autoneg offroot@TOWER:~# ethtool -s eth0 speed 2500 duplex fullroot@TOWER:~# ethtool eth0Settings for eth0:Supported ports: [ TP ]Supported link modes: 100baseT/Full1000baseT/Full10000baseT/Full2500baseT/Full5000baseT/FullSupported pause frame use: SymmetricSupports auto-negotiation: YesSupported FEC modes: Not reportedAdvertised link modes: 2500baseT/FullAdvertised pause frame use: SymmetricAdvertised auto-negotiation: YesAdvertised FEC modes: Not reportedSpeed: 2500Mb/sDuplex: FullAuto-negotiation: onPort: Twisted PairPHYAD: 0Transceiver: internalMDI-X: UnknownSupports Wake-on: dWake-on: dCurrent message level: 0x00000007 (7)drv probe linkLink detected: yes Edited December 22, 2025Dec 22 by chuga
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