It can be difficult to configure K3s networking, particularly when pods require access to external subnets. Connectivity problems arise because pods are by default cut off from networks outside of their worker nodes. Administrators can safely expand pod access by using iptables, static routes, and sophisticated CNIs like Calico. Maintaining functioning and security also heavily depends on network policies and DNS settings. For real-world applications, such as cloud-based services and hybrid IT systems, it is essential to provide smooth connectivity between pods and external machines.

For domain owners to guarantee the successful and secure delivery of their emails, they must manage DMARC and SPF records. Messages that are forwarded to services like Gmail and Yahoo may be rejected or marked as spam due to misconfiguration.