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Co-authored-by: Cursor <cursoragent@cursor.com>
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3.4 KiB

UDM Pro Routing Issue - Quick Fix Summary

Last Updated: 2026-01-14
Status: Solution Ready


🎯 Quick Answer: YES, Change IP to 192.168.11.4

Recommendation: Change your dev machine IP to 192.168.11.4 for immediate access to ml110.

Why:

  • Quickest solution (5 minutes)
  • Bypasses inter-VLAN routing issues
  • Same subnet = no firewall blocking
  • Works immediately

🚀 Immediate Action: Change IP Address

cd /home/intlc/projects/proxmox
sudo ./scripts/unifi/change-ip-to-vlan11-netplan.sh

Manual (If script doesn't work)

  1. Edit netplan config:

    sudo nano /etc/netplan/*.yaml
    
  2. Update eth0 configuration:

    network:
      version: 2
      renderer: networkd
      ethernets:
        eth0:
          addresses:
            - 192.168.11.4/24
          gateway4: 192.168.11.1
          nameservers:
            addresses:
              - 192.168.11.1
              - 8.8.8.8
    
  3. Apply changes:

    sudo netplan apply
    
  4. Verify:

    ip addr show eth0
    ping -c 3 192.168.11.1   # Gateway
    ping -c 3 192.168.11.10  # ml110
    

Verification Steps (After IP Change)

1. Test Connectivity

# Test gateway
ping -c 3 192.168.11.1

# Test ml110
ping -c 3 192.168.11.10

2. Verify Network Isolation (Web UI)

  1. Navigate: Settings → Networks → MGMT-LAN
  2. Scroll to "Network" section
  3. Ensure "Isolate Network" is UNCHECKED
  4. Save if changed

3. Verify Zone Matrix (Web UI)

  1. Click Grid icon (Policy Engine) in sidebar
  2. Find: Internal → Internal
  3. Verify it says "Allow All"
  4. If not, click and change to "Allow All"

4. Check CyberSecure (Web UI)

  1. Click Shield icon (CyberSecure) in sidebar
  2. Check for rules blocking inter-VLAN traffic
  3. Check "Security Posture" mode
  4. Adjust if needed

🔧 Long-Term Solution: Fix ml110 Firewall

After you have access via IP change, fix the root cause:

If ml110 is Proxmox

# SSH to ml110
ssh root@192.168.11.10

# Check firewall
pve-firewall status

# Edit firewall (via web UI or CLI)
# Add rule: Allow 192.168.0.0/24

If ml110 is Linux

# Allow Default network
sudo iptables -A INPUT -s 192.168.0.0/24 -j ACCEPT
sudo iptables-save | sudo tee /etc/iptables/rules.v4

If ml110 is Windows

  1. Windows Firewall → Inbound Rules → New Rule
  2. Allow traffic from 192.168.0.0/24

📋 Complete Checklist

  • Change dev machine IP to 192.168.11.4
  • Test: ping 192.168.11.1 (gateway)
  • Test: ping 192.168.11.10 (ml110)
  • Verify Network Isolation is unchecked
  • Verify Zone Matrix: Internal → Internal = Allow All
  • Check CyberSecure settings
  • Fix ml110 firewall (long-term)
  • (Optional) Revert IP back to 192.168.0.x after firewall fix

🔄 Reverting IP Change (Optional)

After fixing ml110 firewall, you can revert:

# Find backup file
ls -la /etc/netplan/*.backup.*

# Restore
sudo cp /etc/netplan/<config>.backup.* /etc/netplan/<config>.yaml
sudo netplan apply

Or manually change back to:

  • IP: 192.168.0.23/24
  • Gateway: 192.168.0.1

📊 Current Status

  • Routing: Working (can ping gateway 192.168.11.1)
  • Device Access: Blocked (likely ml110 firewall)
  • Solution: Change IP to same subnet (quick) + Fix firewall (long-term)

Last Updated: 2026-01-14