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In 2025, privacy is not a luxury -it’s a battleground.
Hackers, researchers, and privacy enthusiasts often rely on VPNs for “anonymity,” but here’s the harsh reality: most VPNs are glorified proxies with marketing budgets.
They encrypt traffic, sure -but they also log, leak, and lie.
Let’s go beyond the marketing fluff and look at what VPNs really do, how to test them, and how hackers can verify privacy with code and practical tools.
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A VPN encrypts your traffic and masks your IP — but once connected, the VPN provider becomes your new ISP. Every packet passes through their servers.
You can sniff your own traffic to see what’s leaving your system outside the VPN tunnel.
# Run Wireshark or tcpdump before connecting to VPN
sudo tcpdump -i any not port 1194 and not port 443 -n# Then connect to your VPN
# Watch for outbound DNS or HTTP packets - those are leaks.
If you still see traffic going to your ISP’s DNS or public IPs → your VPN leaks.