Enable IPv6 ULA, SLAAC Router Advertisements, NAT66, and E2E validation - #3104
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… and E2E validation * Add IPv6 Unique Local Address (ULA) subnets fd00:cf:22::/64 (cvd-wbr) and fd00:cf:24::/64 (cvd-ebr) to cuttlefish-host-resources defaults and init script. * Configure dnsmasq to broadcast IPv6 Router Advertisements for guest SLAAC autoconfiguration. * Implement native nftables masquerading (NAT66) and forwarding rules in cuttlefish-host-resources.init. * Add nftables dependency in base/debian/control. * Add E2E network integration test in //cvd/network_tests:network_tests verifying SLAAC IP acquisition, guest-to-host dual-stack communication, and pure IPv6-only operation.
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Description
This change adds complete IPv6 support for Cuttlefish instances on the host and validates guest dual-stack and pure IPv6-only operation.
IPv6 Unique Local Addresses (ULA):
fd00:cf:22::/64oncvd-wbrandfd00:cf:24::/64oncvd-ebr./etc/default/cuttlefish-host-resources.Router Advertisements (SLAAC):
dnsmasqto broadcast SLAAC Router Advertisements for autonomous in-guest address assignment.NAT66 & Forwarding:
nftablesmasquerading and forwarding rules incuttlefish-host-resources.init.nftablespackage dependency tocuttlefish-baseindebian/control.Automated E2E Integration Testing:
//cvd/network_tests:network_testsverifying guest SLAAC acquisition, guest-to-host dual-stack communication, and 100% pure IPv6-only functionality after flushing IPv4.