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Talos Linux allows you to configure Ethernet network link settings, such as ring configuration or disabling TCP checksum offloading. The settings and their values closely follow ethtool command line options, so you can use similar recipes.

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Observing current status

You can observe current Ethernet settings in the EthernetStatus resource: 
# talosctl get ethernetstatus enp0s2 -o yaml
spec:
    rings:
        rx-max: 256
        tx-max: 256
        rx: 256
        tx: 256
        tx-push: false
        rx-push: false
    features:
        tx-scatter-gather: on
        tx-checksum-ipv4: off [fixed]
        tx-checksum-ip-generic: on
        tx-checksum-ipv6: off [fixed]
        highdma: on [fixed]
        tx-scatter-gather-fraglist: off [fixed]
        tx-vlan-hw-insert: off [fixed]
        rx-vlan-hw-parse: off [fixed]
        rx-vlan-filter: on [fixed]
        vlan-challenged: off [fixed]
        tx-generic-segmentation: on
        rx-gro: on
        rx-lro: off [fixed]
        tx-tcp-segmentation: on
        tx-gso-robust: on [fixed]
        tx-tcp-ecn-segmentation: on
        tx-tcp-mangleid-segmentation: off
        tx-tcp6-segmentation: on
        tx-fcoe-segmentation: off [fixed]
        tx-gre-segmentation: off [fixed]
        tx-gre-csum-segmentation: off [fixed]
        tx-ipxip4-segmentation: off [fixed]
        tx-ipxip6-segmentation: off [fixed]
        tx-udp_tnl-segmentation: off [fixed]
        tx-udp_tnl-csum-segmentation: off [fixed]
        tx-gso-partial: off [fixed]
        tx-tunnel-remcsum-segmentation: off [fixed]
        tx-sctp-segmentation: off [fixed]
        tx-esp-segmentation: off [fixed]
        tx-udp-segmentation: off
        tx-gso-list: off [fixed]
        tx-checksum-fcoe-crc: off [fixed]
        tx-checksum-sctp: off [fixed]
        rx-ntuple-filter: off [fixed]
        rx-hashing: off [fixed]
        rx-checksum: on [fixed]
        tx-nocache-copy: off
        loopback: off [fixed]
        rx-fcs: off [fixed]
        rx-all: off [fixed]
        tx-vlan-stag-hw-insert: off [fixed]
        rx-vlan-stag-hw-parse: off [fixed]
        rx-vlan-stag-filter: off [fixed]
        l2-fwd-offload: off [fixed]
        hw-tc-offload: off [fixed]
        esp-hw-offload: off [fixed]
        esp-tx-csum-hw-offload: off [fixed]
        rx-udp_tunnel-port-offload: off [fixed]
        tls-hw-tx-offload: off [fixed]
        tls-hw-rx-offload: off [fixed]
        rx-gro-hw: on
        tls-hw-record: off [fixed]
        rx-gro-list: off
        macsec-hw-offload: off [fixed]
        rx-udp-gro-forwarding: off
        hsr-tag-ins-offload: off [fixed]
        hsr-tag-rm-offload: off [fixed]
        hsr-fwd-offload: off [fixed]
        hsr-dup-offload: off [fixed]
    channels:
        combined-max: 1
        combined: 1
The available features depend on the network card and driver. Some values are fixed by the driver and hardware and cannot be changed.

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Configuration

Use the EthernetConfig document to configure Ethernet settings. You can append the machine config document to the machine configuration (separating with ---), or apply it as a machine configuration patch. For example, to disable TCP segmentation on transmit: 
apiVersion: v1alpha1
kind: EthernetConfig
name: enp0s2
features:
  tx-tcp-segmentation: false
For rings and channels configuration, values can be increased if they do not exceed the maximum supported by the network card (the maximum values are reported in the status with -max suffix).

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Enable Wake-on-LAN support

Starting with 1.12, Talos Linux now supports configuring Wake-on-LAN (WOL) directly in the Ethernet configuration. Use the wakeOnLan field under the EthernetConfig resource to enable WOL and specify the desired WOL modes. This allows a node’s network interface to wake the system from a low-power state when receiving a magic packet or other WOL-triggering event. Example: 
apiVersion: v1alpha1
kind: EthernetConfig
name: enp0s3
wakeOnLan:
  enabled: true
  modes: ["magic", "unicast"]

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Supported modes

Supported WOL modes depend on the NIC and driver, but common values include:
  • "magic" — wake on magic packet (most common)
  • "unicast" — wake on unicast packets
  • "multicast" — wake on multicast packets
  • "broadcast" — wake on broadcast packets
  • "phy" — wake on PHY activity
Note: If no modes are specified and enabled: true, Talos defaults to using the “magic” mode when supported by the hardware. WOL functionality requires that your hardware and BIOS/UEFI firmware support it and that it is not disabled there.
You can check WOL support and status with: 
talosctl get ethernetstatus <interface> -o yaml
This command will show the current wakeOnLan settings along with other Ethernet features.