NIC link speed is changing between 100Mb/sec and 1000Mb/sec for no reason
Issue
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Something is changing the ethernet network link speed to 100baseT/Full instead of 1Gb/sec.
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ethtoolshows the interface is no longer advertising 1000baseT/Full as an available link mode:$ ethtool eth0 Settings for eth0: Supported ports: [ TP ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Supported pause frame use: No Supports auto-negotiation: Yes Advertised link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full Advertised pause frame use: No Advertised auto-negotiation: Yes Speed: 1000Mb/s Duplex: Full Port: Twisted Pair PHYAD: 1 Transceiver: internal Auto-negotiation: on MDI-X: off (auto) Cannot get wake-on-lan settings: Operation not permitted Current message level: 0x00000007 (7) drv probe link Link detected: yes
Environment
- Red Hat Enterprise Linux 6
- tuned service
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