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gVisor host network mode prevents Cilium from performing service load balancing (DNAT) on ClusterIP traffic, so DNS requests to the kube-dns ClusterIP (10.43.0.10) are dropped as "world" identity. Three coordinated fixes: - Disable Cilium global DNS proxy (dnsProxy.enabled: false) to stop eBPF-level DNS interception that gVisor cannot handle. - Change CNP DNS egress rule from toEndpoints (kube-dns label matching) to toEntities: ["world"], matching how Cilium classifies gVisor-originated traffic. - Set DNSPolicy: Default on sandbox pods so they use the node's DNS resolver instead of the unreachable ClusterIP.
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gVisor host network mode prevents Cilium from performing service load balancing (DNAT) on ClusterIP traffic, so DNS requests to the kube-dns ClusterIP (10.43.0.10) are dropped as "world" identity.
Three coordinated fixes: