Update incident: DHCP DNS fix for device connectivity

docs/incidents/2026-01-25-adblock-debug-in-progress.md

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+# Debug Session: AdBlock Not Working + Device Connectivity
+
+**Date:** 2026-01-25 13:20  
+**Status:** IN PROGRESS  
+
+---
+
+## Initial Findings
+
+### 1. AdGuardHome-Sync Container
+- **Origin:** 192.168.31.1:80 (MikroTik AdGuard)
+- **Replica:** 192.168.31.4:3000 (Unraid AdGuard)
+- **Sync interval:** Every 30 minutes
+- **Status:** Failing since 10:00 with "no route to host"
+
+**Error:**
+```
+2026-01-25T10:00:01.349Z ERROR sync Error getting origin status
+{"from": "192.168.31.1:80", "error": "dial tcp 192.168.31.1:80: connect: no route to host"}
+```
+
+### 2. AdGuard Filtering Configuration
+- **Filters enabled:** 1 (AdGuard DNS filter only)
+- **AdAway blocklist:** DISABLED
+- **protection_enabled:** true
+- **filtering_enabled:** true (global)
+- **Multiple client profiles have filtering_enabled: false**
+
+### 3. Architecture Discovery
+There are TWO AdGuard instances:
+1. **MikroTik AdGuard** - 192.168.31.1:80 (origin/master)
+2. **Unraid AdGuard** - 192.168.31.4:3000 (replica)
+
+Sync copies config from MikroTik → Unraid
+
+### 4. Current Issue: Devices Have No Internet
+- LG TV showing no connection
+- Likely cause: DNS changes not propagated to DHCP clients
+- Devices may have cached old DNS or DHCP lease hasn't renewed
+
+## To Investigate
+- [ ] Check MikroTik DHCP DNS settings
+- [ ] Check if MikroTik AdGuard is running (container on MikroTik?)
+- [ ] Verify DHCP leases are pushing correct DNS
+- [ ] Check if NAT rules are redirecting properly
+
+---
+
+*Debug session paused - device connectivity issue reported*