node-show-gateway

To find the default network gateway on a Kubernetes node, you can execute a diagnostic command that retrieves the default route and gateway IP address for a specified network interface using the host's network namespace.

You can check the default route for a specific interface by querying the node's network configuration, which parses routing tables to return the gateway IP and interface details for connections like eth0.

Pods may fail to reach external services if the node's default route is misconfigured. You can check node routing by retrieving the default gateway IP to verify external connectivity paths are correctly established.

For switchdev mode PFs, retrieving the gateway directly is not supported. The system identifies these interface types and recommends performing alternative pod-level diagnostics instead of node-level route queries.

Yes, the network gateway diagnostic tool supports RoCE and InfiniBand interfaces. It identifies these specific interface types during execution to accurately handle their routing configurations.

For SRE troubleshooting, the best way to diagnose node network connectivity is to retrieve default gateway IP addresses and associated interface details to quickly pinpoint misconfigured external routes.