Cilium vs ZeroTier

Cilium is an open-source, cloud-native system for providing, securing, and observing network connectivity between workloads using eBPF. Its networking capabilities include CNI, Layer 4 load balancing, Cluster Mesh, kube-proxy replacement, BGP, service mesh, Gateway API, IPv6, host firewall, and ingress. Network policies can enforce identity-aware rules from L3 through L7, including DNS- and HTTP-aware filtering. Security features include runtime protection and transparent encryption of managed host and endpoint traffic using IPsec, WireGuard, or ztunnel; ztunnel support is marked beta. For visibility, Cilium lists service maps, metrics and tracing export, network flow logs, and protocol visibility. Hubble, built on Cilium and eBPF, provides visibility into service communication and behavior. Documentation describes Prometheus and Grafana integrations and Kubernetes support for services including GKE, AKS, EKS, OpenShift, RKE, k3s, and Alibaba ACK. Its container image requires AMD64 or AArch64 hosts running Linux kernel 5.10 or later, or an equivalent kernel such as 4.18 on RHEL 8.10. For environments above 500 nodes, the quick installation guide directs readers to large-environment guidance or specific datapath modes.

ZeroTier is a software-defined networking platform for connecting people, devices and cloud environments through secure virtual networks. Its overlays can span public clouds, private data centers, on-premises environments, remote devices and edge systems. Security measures include cryptographic device identity, end-to-end traffic encryption, peer-to-peer connections when possible, and centrally defined policies enforced globally. Capabilities include cloud-to-cloud networking, global device fleets, identity-based access control, Layer 2 and Layer 3 networking, and programmable management. The platform supports hybrid deployment and lists coverage for DigitalOcean, Amazon Web Services, Google Compute Engine, Microsoft Azure, Oracle Cloud Infrastructure, Alibaba Cloud, IBM Cloud, Vultr and Equinix Metal. Documentation includes API guides and tutorials for Docker, code-server, Terraform, webhooks, and Prometheus/Grafana monitoring. The free Personal plan is limited to non-commercial use and includes 10 devices, one network and one admin. Essential costs $18 a month; Scale costs $179 a month. Platforms include Android, API, iOS, Linux, macOS, self-hosted, web and Windows.