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Plain-language guides to online privacy and VPN technology, plus updates from VPNRice.

Linux Conntrack Zones: Solving Overlapping Subnets in Multi-Tenant VPNs

Learn how Linux Netfilter connection tracking zones (ct zone) isolate identical RFC 1918 subnets, eliminating packet collisions on multi-tenant VPN gateways.

November 14, 2026 · 6 min read

Performance
Linux FIB Trie: Routing Scalability and LPM Architecture for 100K VPN Routes
November 14, 2026 · 6 min read
Security
Linux nftables SYNPROXY: Stateless TCP SYN Flood Defense for VPN Gateways
November 14, 2026 · 6 min read
Performance
Linux SO_BUSY_POLL: Eliminating Network Jitter for Low-Latency VPNs
November 14, 2026 · 6 min read
Security
Linux cgroups v2: Multi-Tenant Resource Isolation & QoS for High-Density VPNs
November 14, 2026 · 5 min read
Performance
Linux epoll (EPOLLET, EPOLLONESHOT): Scalable I/O for High-Concurrency VPNs
November 14, 2026 · 6 min read
Performance
Linux SR-IOV and Macvtap: Hardware I/O Virtualization for Multi-Tenant VPNs
November 14, 2026 · 6 min read
Security
Linux TC Flower (cls_flower): Wire-Speed Hardware Offload for VPN Gateways
November 14, 2026 · 6 min read
Performance
Linux TUN Multiqueue (IFF_MULTI_QUEUE): Scaling Packet I/O Across Multi-Core VPNs
November 14, 2026 · 5 min read
Privacy
DiffServ RFC 2983 and DSCP Metadata Leakage in Encrypted VPN Tunnels
November 13, 2026 · 7 min read