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

Linux Threaded NAPI: Eliminating Softirq Starvation in VPN Gateways

Discover how Linux Threaded NAPI moves packet polling from softirqs to dedicated kthreads, eliminating CPU starvation and jitter in high-throughput VPN nodes.

November 14, 2026 · 5 min read

Performance
Linux eBPF XDP: Line-Rate VPN Encapsulation via bpf_xdp_adjust_head
November 14, 2026 · 6 min read
Performance
Linux IP_BIND_ADDRESS_NO_PORT: Eliminating Port Exhaustion in VPN Gateways
November 14, 2026 · 5 min read
Security
Linux Conntrack Helpers: Defending VPNs Against NAT Slipstreaming
November 14, 2026 · 7 min read
Performance
Linux eBPF sock_ops: Dynamic TCP Stack Tuning for VPN Gateways
November 14, 2026 · 5 min read
Performance
Linux eBPF Connect-Time Redirection: Zero-Overhead Split Tunneling for VPNs
November 14, 2026 · 6 min read
Performance
Linux eBPF sk_lookup: Programmable Socket Routing for High-Scale VPN Gateways
November 14, 2026 · 7 min read
Firewall
Linux Conntrack Zones: Solving Overlapping Subnets in Multi-Tenant VPNs
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