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networking.allowPing was a top-level networking option when firewall.enable = true. With firewall.enable = false (T3 Option A), the option no longer exists at the networking level. ICMP is now handled by the nftables ruleset directly (). Rebuild error: 'The option networking.allowPing does not exist. Definition values: networking.domain, networking.vlans, networking.wicd.' Fix: remove the line. No behavior change — ICMP is still accepted via nftables.