# UDM Pro MAC Address Verification

**Date**: 2026-01-22  
**Status**: ⚠️ **MAC ADDRESS MISMATCH DETECTED**

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## UDM Pro Client List (Current)

### Client 1
- **MAC**: `bc:24:11:a8:c1:5d`
- **IP**: `192.168.11.166`
- **Uptime**: 3d 22h 39m 51s
- **Data**: 0 bps (no activity)

### Client 2
- **MAC**: `bc:24:11:18:1c:5d`
- **IP**: `192.168.11.167`
- **Uptime**: 3d 22h 40m 12s
- **Data**: 55.5 MB (active)

### Client 3
- **MAC**: `bc:24:11:8d:ec:b7`
- **IP**: `192.168.11.168`
- **Uptime**: Jan 22 2026 1:36 PM
- **Data**: 0 bps (no activity)

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## Expected MAC Addresses (From Container Config)

### From Proxmox Configuration
- **192.168.11.166** (eth0, net0): MAC `BC:24:11:18:1C:5D`
- **192.168.11.167** (eth1, net1): MAC `BC:24:11:A8:C1:5D`

### Expected Mapping
- **192.168.11.166** → MAC `bc:24:11:18:1c:5d` ✅
- **192.168.11.167** → MAC `bc:24:11:a8:c1:5d` ✅

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## UDM Pro Mapping (Actual)

- **192.168.11.166** → MAC `bc:24:11:a8:c1:5d` ❌ **WRONG**
- **192.168.11.167** → MAC `bc:24:11:18:1c:5d` ❌ **WRONG**

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## Analysis

### Issue
UDM Pro has **swapped MAC addresses**:
- It shows MAC `bc:24:11:a8:c1:5d` for IP 192.168.11.166 (should be .167)
- It shows MAC `bc:24:11:18:1c:5d` for IP 192.168.11.167 (should be .166)

### Possible Causes
1. **ARP confusion**: ARP table may have incorrect mappings
2. **Traffic source**: Traffic from 192.168.11.166 may have used wrong source MAC
3. **UDM Pro caching**: UDM Pro may have cached old MAC-to-IP mappings
4. **Network routing**: Kernel may be using wrong interface for routing

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## Verification

Checking actual MAC addresses from container...

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## Resolution

### Option 1: Clear ARP Cache
Clear ARP cache on UDM Pro and network devices to force re-discovery:
- UDM Pro may need to refresh its ARP table
- Wait for ARP entries to expire and renew

### Option 2: Generate Correct Traffic
Force traffic from correct IP-MAC pairs:
- Generate traffic from 192.168.11.166 using eth0 (correct MAC)
- Generate traffic from 192.168.11.167 using eth1 (correct MAC)

### Option 3: Wait for Natural Refresh
ARP entries expire naturally (usually 4 hours)
- UDM Pro will eventually update with correct mappings
- Traffic will naturally correct the mappings over time

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**Status**: MAC addresses swapped in UDM Pro - verifying actual mappings...