Egress-Only Internet Gateways Return to table of contents Useful Links: IPv6 Subnet Cheat Sheet and IPv6 Cheat Sheet Reference IPv6 Subnetting - Overview and Case Study Exam Tips: With IPv6 all subnets are essentially public. Known when to integrate an EIGW: When wanting to allow outbound only IPv6 traffic. Not used for IPv4, that would be a NAT Gateway.