Sun Apr 12 20:15:21 2026 kern.info kernel: [191597.718982] igb 0000:03:00.0 eth2: igb: eth2 NIC Link is Down
Sun Apr 12 20:15:21 2026 kern.info kernel: [191597.725028] br-lan: port 1(eth2) entered disabled state
Sun Apr 12 20:15:21 2026 daemon.notice netifd: Network device 'eth2' link is down
Sun Apr 12 20:15:24 2026 kern.info kernel: [191600.819324] igb 0000:03:00.0 eth2: igb: eth2 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX
Sun Apr 12 20:15:24 2026 kern.info kernel: [191600.831030] br-lan: port 1(eth2) entered blocking state
Sun Apr 12 20:15:24 2026 kern.info kernel: [191600.837796] br-lan: port 1(eth2) entered forwarding state
Sun Apr 12 20:15:24 2026 daemon.notice netifd: Network device 'eth2' link is up
Sun Apr 12 20:15:26 2026 kern.info kernel: [191602.209044] igb 0000:03:00.0 eth2: igb: eth2 NIC Link is Down
Sun Apr 12 20:15:26 2026 kern.info kernel: [191602.216569] br-lan: port 1(eth2) entered

搜了一圈，可能跟 Energy Efficient Ethernet 有关系。
很多交换机或路由器有 "Energy Efficient Ethernet" 功能，它会在检测到流量低时让网口进入低功耗状态，导致 Apple TV 认为断开。

强制绑定 homekit ，让网口心跳一直保持，就好了。
大家是怎么解决的?