4 ms·You can’t punch any holes through carrier-grade NAT (CGNAT).by akdev1l 2y agoYou can’t punch any holes through carrier-grade NAT (CGNAT).vetinari 2y agoYou can, if your ISP cooperates, using PCP.fooqux 2y agoFrankly, you lost me at "if your ISP cooperates".vetinari 2y agoIt is a function of the CGNAT at the ISP side. They need to have that enabled. Some do.