---
title: "Perfect DNS Setup: Ubiquiti UCG Fiber + dnsmasq (strict-order custom conf) + Pi-hole + QNAP"
url: "https://forum.qnap.net.pl/threads/perfect-dns-setup-ubiquiti-ucg-fiber-dnsmasq-strict-order-custom-conf-pi-hole-qnap.42246/"
thread_id: 42246
date: "2025-08-22"
category: "Wiedza"
section: "Research Tuts/Notes"
source: "Forum QNAP Polska"
site: "https://forum.qnap.net.pl"
language: "pl"
ai_policy: "https://forum.qnap.net.pl/ai-policy.md"
license: "https://forum.qnap.net.pl/ai-policy.md"
---

# Perfect DNS Setup: Ubiquiti UCG Fiber + dnsmasq (strict-order custom conf) + Pi-hole + QNAP

> Source: <https://forum.qnap.net.pl/threads/perfect-dns-setup-ubiquiti-ucg-fiber-dnsmasq-strict-order-custom-conf-pi-hole-qnap.42246/> · Wiedza · Forum QNAP Polska · 2025-08-22

The biggest problem with Ubiquiti and Pi-hole is that if the Pi-hole server goes down, the DNS server in Ubiquiti will stop functioning properly. If you want to set up failover, in practice this is impossible. Adding a second DNS server in Ubiquiti will result in Ubiquiti using them alternately, which makes Pi-hole meaningless. The only solution is to set "strict-order" in the dnsmasq config, with DNS1 in Ubiquiti set to Pi-hole, and DNS2 set, for example, to the public 8.8.8.8. Below is a patch that enables this behavior.

1. Install FAN control for UCG Fiber which will add to auto start with router restart

```bash
curl -sSL https://raw.githubusercontent.com/iceteaSA/ucg-max-fan-control/main/install.sh | sudo bash
```

( Source: [GitHub - iceteaSA/ucg-max-fan-control: UXG-Max/Fibre Dynamic Fan Control](https://github.com/iceteaSA/ucg-max-fan-control) )

2. Once installed go to:

```bash
cd /data/fan-control/
```

3. Create `05-custom_apply.conf` file with commands:

```bash
apt install mc
medit 05-custom_apply.conf
```

4. Paste code bellow:

```ini
strict-order            # dnsmasq will send queries to any of the upstream servers
no-negcache             # Disable negative caching
min-cache-ttl=1800      # min 30 min
max-cache-ttl=86400     # 1 day maximum
cache-size=10240

# reload
# sudo pkill -USR1 dnsmasq && tail -50 /var/log/daemon.log |grep dnsmasq
```

5. Edit `fan-control.sh`:

```bash
mcedit fan-control.sh
```

6. Bellow bash header enter:

```bash
[ -f "/etc/dnsmasq.d/05-custom_apply.conf" ] || cp -af 05-custom_apply.conf /etc/dnsmasq.d/05-custom_apply.conf
```

7. From now each reboot your dnsmasq custom conf will apply.

---

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