Co-Authored-By: Claude.ai

domain = {{ pihole_domain }} rendered as an unquoted bareword containing
a dot (e.g. "pi.hole"), which is invalid TOML. TOML parsing is
all-or-nothing, not line-by-line, so pihole-FTL rejected the entire
config file on that one line and silently fell back to its compiled-in
defaults — including binding its webserver directly to ports 80/443.
That collided with caddy, which wants the same ports, causing caddy to
crash-loop and get reported as "changed" (needing a restart) on every
subsequent ansible run.

Quoting the domain value lets the file parse successfully, which in turn
surfaces a second, previously-unreachable bug: the custom webserver port
(pihole_port) was rendered as a bare number, but Pi-hole v6 FTL requires
each listener address to carry a trailing flag character (o = optional,
s = TLS). Without it FTL rejects the value the same way and reverts to
the 80/443 default. Appending "o" fixes that.

Both bugs had to be fixed together: the quoting bug was blocking the
parser from ever reaching the port line, so the port fix alone had no
effect until parsing succeeded end-to-end.

Co-Authored-By: Claude.ai

Add radvd to gateway role to advertise Pi as high-preference IPv6
default router using the stable ULA prefix (fd1e:.../64). With
FritzBox also sending RAs, devices end up with ECMP between Pi and
FritzBox. To solve this, add network_ipv6_gateway (Pi's link-local)
as a static route with metric 100 to all managed hosts — beats RA
metric 425, ensuring all IPv6 default traffic goes through Pi.

Fix IPv6 MASQUERADE in gateway-apply-rules:
- Direct mode: add MASQUERADE on end0 (LAN devices use ULA source
  addresses not known to FritzBox, so Pi must NAT them)
- FORWARD rules: restrict to RELATED,ESTABLISHED only — previously
  the broad ACCEPT rule passed un-NAT'd packets alongside masqueraded
  copies, causing duplicate SYNs, conntrack corruption, and RSTs
- MASQUERADE/clear rules: match by interface not by source subnet
  (devices may use any source address, not just the ULA prefix)
- VPN mode return traffic: explicitly restrict to wg+→end0 direction

Add network_ipv6_gateway var (optional) to network role NM templates
(ethernet, wifi, bridge) — injects a static IPv6 default route at
metric 100 when set. Add rpi5 static route to FritzBox link-local so
Pi keeps IPv6 after FritzBox RA is disabled.

Force SSH to IPv4 for *.local hosts (AddressFamily inet) — prevents
Ansible from hanging on mDNS returning multiple IPv6 addresses.

Update gateway and pihole READMEs with two-step IPv6 setup process.

Co-Authored-By: Claude.ai

Remove static IPv6 support from network role — all hosts use SLAAC
(method=auto). Simplifies NM templates, argument_specs, and resolved.conf.
gateway sysctl accept_ra=2 is now unconditional when gateway_enabled.

Co-authored-by: Claude.ai