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Diffstat (limited to 'roles/gateway/README.md')
| -rw-r--r-- | roles/gateway/README.md | 26 |
1 files changed, 14 insertions, 12 deletions
diff --git a/roles/gateway/README.md b/roles/gateway/README.md index cfbe49d3..6c46cc9b 100644 --- a/roles/gateway/README.md +++ b/roles/gateway/README.md @@ -19,20 +19,22 @@ gateway_router_interface: "end0" ### IPv6 Support (Optional) -IPv6 gateway is enabled by setting both `network_ipv6_address` and `gateway_local_ipv6_subnet`: +IPv6 gateway is enabled by setting `gateway_local_ipv6_subnet` to the ULA prefix advertised by radvd: ```yaml -network_ipv6_address: "2a02:xxxx:xxxx:xxxx::254/64" # Pi's IPv6 address -gateway_local_ipv6_subnet: "2a02:xxxx:xxxx:xxxx::/64" # LAN IPv6 subnet +gateway_local_ipv6_subnet: "fd00:xxxx:xxxx:xxxx::/64" # ULA prefix (stable, router-independent) ``` -To disable IPv6 entirely, remove both variables from `host_vars`. The role will: -- Omit `accept_ra` sysctl (no IPv6 interface key written) -- Skip IPv6 iptables masquerade rules (`gateway_local_ipv6_subnet` defaults to `""`) -- Leave `net.ipv6.conf.all.forwarding=0` +When set, this role: +- Enables `net.ipv6.conf.all.forwarding=1` and `accept_ra=2` on `gateway_router_interface` +- Deploys radvd advertising the ULA prefix with `AdvDefaultPreference high` — Pi wins as IPv6 default router +- Adds ip6tables MASQUERADE/FORWARD rules matching by interface (not subnet) so all source addresses are handled -**Note:** `accept_ra` is set per-interface (`gateway_router_interface`) only when IPv6 is enabled. -This prevents rogue RA acceptance on WireGuard and LAN interfaces. +**Prerequisite:** Disable the router's RA (FritzBox: Home Network > IPv6 > Router advertisement > ❌) after +setting `network_ipv6_gateway` in `host_vars` so Pi keeps its static IPv6 default route to the router. +See `roles/pihole/README.md` for the full two-step setup. + +To disable IPv6, leave `gateway_local_ipv6_subnet: ""` (default). The role skips all ip6tables rules and disables radvd. ## Network Architecture @@ -63,9 +65,9 @@ Client Devices (192.168.1.0/24) **Direct Mode Characteristics:** -- All traffic NAT'd through router interface (`end0`) -- Direct IPv4/IPv6 routing to ISP -- Standard internet routing +- IPv4 traffic NAT'd through router interface (`end0`) +- IPv6 forwarded without NAT (globally routable addresses, native routing) +- Standard internet routing via ISP ## Requirements |