Escaping CGNAT: Exposing Local Services Using Pure IPv6 Tunnels
IT InstaTunnel Team Published by our engineering team Trapped behind your ISP’s Carrier-Grade NAT? Stop paying for expensive IPv4 relay servers. Here is how to configure a pure IPv6 tunnel to expose your local services — for free. The Problem No One Warned You About The modern internet has a dirty secret: the public IPv4 address your home router reports to you is almost certainly not yours. Millions of residential and commercial subscribers share a single upstream IP with hundreds or thousands of neighbours, courtesy of Carrier-Grade NAT (CGNAT) — a stopgap measure their ISPs quietly deployed years ago and have no financial incentive to undo. The root cause is straightforward. IPv4’s 32-bit architecture supports only 4.3 billion unique addresses, a ceiling that was breached permanently beginning in 2011 when IANA exhausted its global free pool. The regional registries followed in rapid succession: APNIC (Asia-Pacific) in April 2011, RIPE NCC (Europe) in September 2012, LACNIC (La...