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Configuration

Physical network interfaces (links) can be configured in Talos Linux using the LinkConfig configuration objects. The following properties can be configured for physical links:
  • MTU (mtu): sets the Maximum Transmission Unit for the interface (default is 1500).
  • bring the link up or down (up): controls whether the interface is administratively up or down.
Here is an example of configuring a physical network interface with a specific MTU and bringing it up: 
apiVersion: v1alpha1
kind: LinkConfig
name: enp0s3
mtu: 9000
up: true
Link aliases can also be used to refer to physical links in a more user-friendly way: 
apiVersion: v1alpha1
kind: LinkAliasConfig
name: mgmt
selector:
    match: mac(link.permanent_addr) == "00:1a:2b:3c:4d:5e"
---
apiVersion: v1alpha1
kind: LinkConfig
name: mgmt
mtu: 9000
up: true
For low-level control over physical link properties, such as offloading features, refer to the Ethernet configuration documentation.

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Observing status

Use talosctl to observe the status of all links: 
$ talosctl get links
NODE         NAMESPACE   TYPE         ID          VERSION   ALIAS   TYPE       KIND     HW ADDR                                           OPER STATE   LINK STATE
172.20.0.2   network     LinkStatus   bond0       1                 ether      bond     3e:f0:5c:84:4b:5e                                 down         false
172.20.0.2   network     LinkStatus   dummy0      1                 ether      dummy    1e:e5:74:54:52:21                                 down         false
172.20.0.2   network     LinkStatus   enp0s2      3         net0    ether               ae:48:3d:ca:38:28                                 up           true
172.20.0.2   network     LinkStatus   flannel.1   2                 ether      vxlan    fa:1a:43:6d:23:e1                                 unknown      true
172.20.0.2   network     LinkStatus   ip6tnl0     1                 tunnel6    ip6tnl   00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00   down         false
172.20.0.2   network     LinkStatus   lo          2                 loopback            00:00:00:00:00:00                                 unknown      true
172.20.0.2   network     LinkStatus   sit0        1                 sit        sit      00:00:00:00                                       down         false
172.20.0.2   network     LinkStatus   teql0       1                 void                                                                  down         false
172.20.0.2   network     LinkStatus   tunl0       1                 ipip       ipip     00:00:00:00                                       down         false
The output shows all network links, their operational state, and other relevant information. To see the list of links managed by Talos, use the following: 
$ talosctl get linkspecs
NODE         NAMESPACE   TYPE       ID       VERSION
172.20.0.2   network     LinkSpec   enp0s2   6
172.20.0.2   network     LinkSpec   lo       2
To see the list of link configuration broken down by configuration source, add --namespace=network-config flag: 
$ talosctl get links --namespace=networkconfig
NODE         NAMESPACE        TYPE       ID                     VERSION
172.20.0.2   network-config   LinkSpec   configuration/enp0s2   1
172.20.0.2   network-config   LinkSpec   default/lo             1
172.20.0.2   network-config   LinkSpec   dhcp4/enp0s2/enp0s2    1