Vlan

This post documents setting up VLAN separation to isolate Kubernetes cluster traffic from bulk data transfers on a dual-homed node. The minis node has two NICs - one for Kubernetes API and overlay networking, another for pod data traffic like large file downloads. The Problem The minis Kubernetes node in the DMZ became unresponsive during large file transfers. Pods downloading or uploading large files saturated the network connection, affecting Kubernetes API communication, kubelet health checks, and Calico VXLAN overlay traffic. ...

After enabling VLAN filtering on my MikroTik CRS310-8G+2S+ switch with an incorrect configuration, I lost all management access. The switch was unreachable via SSH, web UI, and ping. This post documents the recovery process using MAC-Telnet to regain access at Layer 2. The Problem The switch had VLAN filtering enabled with the uplink port (ether5, connected to OPNsense) configured as tagged for VLAN 1 when it should have been untagged. This meant: ...