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projects/community-forum/forum-posts/cachyos-tailscale-fix.md

@@ -1,92 +0,0 @@
-# Fix: Tailscale Health Warnings on CachyOS (Arch) with KDE Plasma
-
-## Environment
-- OS: CachyOS (Arch-based), kernel 6.19.7-1-cachyos
-- DE: KDE Plasma 6 (Wayland)
-- Tailscale: 1.94.2
-
-## Problem
-
-`tailscale status` showed two health warnings:
-
-```
-# Health check:
-#     - systemd-resolved and NetworkManager are wired together incorrectly; MagicDNS will probably not work.
-#     - Some peers are advertising routes but --accept-routes is false
-```
-
-## Diagnosis
-
-### Issue 1: Accept Routes
-Peers (pfSense, NAS) were advertising subnet routes but the machine wasn't accepting them:
-```bash
-tailscale status --json | python3 -c "
-import json,sys
-d=json.load(sys.stdin)
-for k,v in d.get('Peer',{}).items():
-    routes = v.get('PrimaryRoutes', [])
-    if routes:
-        print(f\"{v['HostName']}: {routes}\")
-"
-# Output: pfSense: ['172.16.0.0/22'], D2TESTNAS: ['192.168.0.0/24']
-```
-
-### Issue 2: DNS Wiring
-```bash
-resolvectl status
-# resolv.conf mode: foreign   <-- WRONG, should be "stub"
-
-ls -la /etc/resolv.conf
-# -rw-r--r-- 1 root root 86 ...   <-- regular file, NOT a symlink
-
-cat /etc/NetworkManager/NetworkManager.conf
-# Empty - no dns= directive
-```
-
-NetworkManager was generating `/etc/resolv.conf` directly instead of going through systemd-resolved. Tailscale needs systemd-resolved to handle MagicDNS (.ts.net) queries.
-
-## Fix
-
-### Fix 1: Accept Routes
-```bash
-sudo tailscale set --accept-routes
-```
-
-### Fix 2: Wire NetworkManager to systemd-resolved
-
-Step 1 - Tell NetworkManager to use systemd-resolved as DNS backend:
-```bash
-sudo tee /etc/NetworkManager/conf.d/dns.conf > /dev/null << 'EOF'
-[main]
-dns=systemd-resolved
-EOF
-```
-
-Step 2 - Fix the resolv.conf symlink:
-```bash
-sudo ln -sf /run/systemd/resolve/stub-resolv.conf /etc/resolv.conf
-```
-
-Step 3 - Restart services:
-```bash
-sudo systemctl restart NetworkManager
-sudo systemctl restart systemd-resolved
-sudo systemctl restart tailscaled
-```
-
-## Verification
-
-```bash
-resolvectl status
-# resolv.conf mode: stub   <-- CORRECT
-
-tailscale status
-# No health warnings
-
-ping d2testnas
-# PING d2testnas.tailea2889.ts.net (100.85.152.90) - MagicDNS working
-```
-
-## Why This Happens
-
-CachyOS (and many Arch installs) ship with both NetworkManager and systemd-resolved active, but NetworkManager isn't configured to delegate DNS to systemd-resolved. It writes `/etc/resolv.conf` directly, bypassing the resolved stub. Tailscale configures its MagicDNS via systemd-resolved's D-Bus API, so if resolved isn't actually handling queries, `.ts.net` names won't resolve.