loc_az_hci/infrastructure/proxmox/SIMPLE_DHCP_DEPLOYMENT.md

Simple DHCP Deployment - All NICs with IP Detection

Simplified Approach

Instead of trying to detect interface speeds, we now:

1. Detect all physical NICs
2. Configure all with DHCP (or first two for vmbr0/vmbr1)
3. Let DHCP assign IPs to connected interfaces
4. Detect which interfaces got IP addresses

Scripts Available

Option 1: Configure All NICs with DHCP (Recommended)

./network-config-dhcp-all.sh

This script:

• Detects ALL physical NICs
• Creates a DHCP bridge for EACH NIC (vmbr0, vmbr1, vmbr2, etc.)
• Shows which bridges got IP addresses
• Works for any number of NICs

Use this if you want to configure all NICs and see which ones get IPs.

Option 2: Configure Two NICs (vmbr0/vmbr1) with DHCP

./network-config.sh

This script:

• Detects all physical NICs
• Uses first two NICs for vmbr0 (LAN) and vmbr1 (WAN)
• Both configured with DHCP
• Shows which ones got IP addresses

Use this if you only want vmbr0 and vmbr1 configured.

Quick Deployment

On R630 (pve2)

cd /opt/proxmox-network-config

# Option A: Configure all NICs
./network-config-dhcp-all.sh

# Option B: Configure just vmbr0/vmbr1
./network-config.sh

On ML110 (pve)

cd /opt/proxmox-network-config
./network-config.sh

How It Works

1. Detects all physical NICs (excludes bridges, bonds, VLANs)
2. Configures bridges with DHCP on all (or first two)
3. Applies configuration and waits for DHCP
4. Shows IP detection results - which interfaces got IPs

IP Detection Results

After deployment, the script shows:

✓ vmbr0 (nic0): 192.168.1.49/24
✗ vmbr1 (nic1): No IP address assigned
✓ vmbr2 (nic2): 203.0.113.10/24

This tells you:

• Which interfaces are connected and have DHCP
• Which interfaces got IP addresses
• Which ones to use for LAN vs WAN

Example Usage

Step 1: Preview Configuration

DRY_RUN=true ./network-config-dhcp-all.sh

Review the configuration to see which NICs will be configured.

Step 2: Apply Configuration

./network-config-dhcp-all.sh

Step 3: Check IP Detection

The script automatically shows which bridges got IP addresses. You can also check manually:

ip addr show

Step 4: Verify Routing

ip route show

The default route should go through the interface with the public IP (WAN).

Advantages

✅ Simple - No complex speed detection ✅ Reliable - DHCP determines connectivity ✅ Flexible - Works with any number of NICs ✅ Clear - Shows exactly which interfaces got IPs ✅ Automatic - Let DHCP decide which interfaces are active

Troubleshooting

No IPs Assigned

If no interfaces get IP addresses:

• Check cables are connected
• Verify DHCP servers are available
• Wait a few moments - DHCP can take time
• Check: dhclient -v vmbr0

Wrong Interfaces Selected

If you want specific NICs:

# For network-config.sh (two NICs only)
NIC1_OVERRIDE=nic2 NIC2_OVERRIDE=nic3 ./network-config.sh

For network-config-dhcp-all.sh, it configures all NICs, so you can see which ones get IPs.

Check Interface Status

# See all interfaces
ip link show

# See IPs on all bridges
for br in vmbr0 vmbr1 vmbr2 vmbr3; do
    ip addr show $br 2>/dev/null | grep "inet " || echo "$br: No IP"
done

Which Script to Use?

• network-config-dhcp-all.sh: Configure ALL NICs, see which ones get IPs
• network-config.sh: Configure just vmbr0/vmbr1 with first two NICs

Both use DHCP and detect IP addresses automatically!