From a4c50351f5d55438a102d48c63dcbb62f9ef5e8d Mon Sep 17 00:00:00 2001
From: "Henry J. Webster" <hwebs@hwebs.info>
Date: Tue, 4 Aug 2026 17:10:10 -0500
Subject: networking: expose Ollama and mDNS on Wi-Fi LAN

Serve Ollama on kusanagi's Wi-Fi LAN while removing the blanket tailscale0 firewall trust so tailnet traffic follows explicit host firewall rules instead of inheriting every listening service.

Add shared LAN networking for both hosts: allow ping, publish and resolve .local names with Avahi, and scope mDNS to each machine's declared Wi-Fi interface.

Assisted-by: OpenAI:gpt-5
---
 machines/enzo/default.nix     | 1 +
 machines/kusanagi/default.nix | 8 +++++++-
 machines/kusanagi/desktop.nix | 7 -------
 3 files changed, 8 insertions(+), 8 deletions(-)

(limited to 'machines')

diff --git a/machines/enzo/default.nix b/machines/enzo/default.nix
index 3246ca3..c243a80 100644
--- a/machines/enzo/default.nix
+++ b/machines/enzo/default.nix
@@ -16,6 +16,7 @@
   ];
 
   networking.hostName = "enzo";
+  lanDiscovery.interface = "wlp1s0";
 
   # Set this to the NixOS release the laptop is first installed from, then
   # leave it. (See the comment in machines/kusanagi/default.nix.)
diff --git a/machines/kusanagi/default.nix b/machines/kusanagi/default.nix
index 1c8ccb1..867a5eb 100644
--- a/machines/kusanagi/default.nix
+++ b/machines/kusanagi/default.nix
@@ -1,7 +1,7 @@
 # kusanagi — AMD workstation. Everything here is specific to this machine:
 # ROCm/GPU, the Focusrite Scarlett audio interface, optical-disc archiving, the
 # NAS mounts, and the Kavita/Immich/Ollama servers.
-{ pkgs, ... }:
+{ config, pkgs, ... }:
 
 {
   imports = [
@@ -18,6 +18,11 @@
   sandbox.owner = "henz";
 
   networking.hostName = "kusanagi";
+  lanDiscovery.interface = "wlp8s0";
+
+  # Ollama is served on the Wi-Fi LAN only. Tailscale remains governed by ACLs
+  # plus the host firewall because tailscale0 is not a trusted interface.
+  networking.firewall.interfaces.${config.lanDiscovery.interface}.allowedTCPPorts = [ 11434 ];
 
   # This value determines the NixOS release from which the default
   # settings for stateful data, like file locations and database versions
@@ -219,6 +224,7 @@
   services.ollama = {
     enable = true;
     package = pkgs.ollama-rocm;
+    host = "0.0.0.0";
     environmentVariables = {
       # No HIP_VISIBLE_DEVICES / HSA_OVERRIDE_GFX_VERSION: the 7900 XT is
       # native gfx1100 and discovery excludes the unsupported Raphael iGPU
diff --git a/machines/kusanagi/desktop.nix b/machines/kusanagi/desktop.nix
index c865844..44b9c81 100644
--- a/machines/kusanagi/desktop.nix
+++ b/machines/kusanagi/desktop.nix
@@ -22,13 +22,6 @@
     drivers = with pkgs; [ gutenprint ];
   };
 
-  # mDNS: printer discovery, and resolves kusanagi's *.local NAS names.
-  services.avahi = {
-    enable = true;
-    nssmdns4 = true;
-    openFirewall = true;
-  };
-
   # prevent auto-mounting optical disks
   services.udisks2.enable = true;
 
-- 
cgit v1.3