# Full-Mesh VNet Peering Complete ✅

## Overview

A **full-mesh VNet peering** has been created between all 6 VNets, enabling direct communication between any pair of VNets without routing through the proxy.

## VNets in Full Mesh

1. **Proxy VNet**: `az-p-wst-proxy-vnet` (West Europe)
2. **Central US**: `az-p-cus-vm-vnet`
3. **East US**: `az-p-eus-vm-vnet`
4. **East US 2**: `az-p-eus2-vm-vnet`
5. **West US**: `az-p-wus-vm-vnet`
6. **West US 2**: `az-p-wus2-vm-vnet`

## Peering Topology

### Total Peerings
- **VNet Pairs**: 15 (C(6,2) = 15)
- **Bidirectional Peerings**: 30 (15 pairs × 2 directions)
- **Peerings per VNet**: 5 (each VNet peers with the other 5)

### Peering Matrix

| VNet A | VNet B | A→B Peering | B→A Peering |
|--------|--------|-------------|-------------|
| `az-p-wst-proxy-vnet` | `az-p-cus-vm-vnet` | ✅ | ✅ |
| `az-p-wst-proxy-vnet` | `az-p-eus-vm-vnet` | ✅ | ✅ |
| `az-p-wst-proxy-vnet` | `az-p-eus2-vm-vnet` | ✅ | ✅ |
| `az-p-wst-proxy-vnet` | `az-p-wus-vm-vnet` | ✅ | ✅ |
| `az-p-wst-proxy-vnet` | `az-p-wus2-vm-vnet` | ✅ | ✅ |
| `az-p-cus-vm-vnet` | `az-p-eus-vm-vnet` | ✅ | ✅ |
| `az-p-cus-vm-vnet` | `az-p-eus2-vm-vnet` | ✅ | ✅ |
| `az-p-cus-vm-vnet` | `az-p-wus-vm-vnet` | ✅ | ✅ |
| `az-p-cus-vm-vnet` | `az-p-wus2-vm-vnet` | ✅ | ✅ |
| `az-p-eus-vm-vnet` | `az-p-eus2-vm-vnet` | ✅ | ✅ |
| `az-p-eus-vm-vnet` | `az-p-wus-vm-vnet` | ✅ | ✅ |
| `az-p-eus-vm-vnet` | `az-p-wus2-vm-vnet` | ✅ | ✅ |
| `az-p-eus2-vm-vnet` | `az-p-wus-vm-vnet` | ✅ | ✅ |
| `az-p-eus2-vm-vnet` | `az-p-wus2-vm-vnet` | ✅ | ✅ |
| `az-p-wus-vm-vnet` | `az-p-wus2-vm-vnet` | ✅ | ✅ |

## Peering Configuration

All peerings created with:
- ✅ `allowVirtualNetworkAccess = true`
- ✅ `allowForwardedTraffic = true`
- ✅ `useRemoteGateways = false`
- ✅ Bidirectional (both directions)

## Peering Naming Convention

Peerings are named using the pattern:
- `{source-vnet-name}-to-{destination-vnet-name}`

Examples:
- `az-p-wst-proxy-vnet-to-az-p-cus-vm-vnet`
- `az-p-cus-vm-vnet-to-az-p-wst-proxy-vnet`
- `az-p-eus-vm-vnet-to-az-p-wus-vm-vnet`

## Network Address Spaces

| VNet | Address Space | Subnet |
|------|---------------|--------|
| `az-p-wst-proxy-vnet` | 10.10.0.0/16 | 10.10.1.0/24 |
| `az-p-cus-vm-vnet` | 10.3.0.0/16 | 10.3.1.0/24 |
| `az-p-eus-vm-vnet` | 10.1.0.0/16 | 10.1.1.0/24 |
| `az-p-eus2-vm-vnet` | 10.4.0.0/16 | 10.4.1.0/24 |
| `az-p-wus-vm-vnet` | 10.2.0.0/16 | 10.2.1.0/24 |
| `az-p-wus2-vm-vnet` | 10.5.0.0/16 | 10.5.1.0/24 |

## Benefits of Full Mesh

1. **Direct Communication**: Any VNet can communicate directly with any other VNet
2. **No Single Point of Failure**: Communication doesn't depend on the proxy VNet
3. **Lower Latency**: Direct paths reduce network hops
4. **P2P Support**: Besu nodes can discover and connect to peers across regions
5. **Consensus Support**: Validators can communicate directly for consensus

## Verification

### Check Peering Status
```bash
# List all peerings for a specific VNet
az network vnet peering list \
  --resource-group <RG_NAME> \
  --vnet-name <VNET_NAME> \
  --query "[].{Name:name, State:peeringState, RemoteVNet:remoteVirtualNetwork.id}" \
  -o table
```

### Test Connectivity
From any VM, test connectivity to any other VM:
```bash
# From Nginx VM (10.10.1.4) to Besu nodes
for IP in 10.1.1.4 10.2.1.4 10.3.1.4 10.4.1.4 10.5.1.4; do
  curl -s -X POST -H "Content-Type: application/json" \
    --data '{"jsonrpc":"2.0","method":"eth_chainId","params":[],"id":1}' \
    http://$IP:8545
done

# Cross-VNet test (from one Besu node to another)
curl -s -X POST -H "Content-Type: application/json" \
  --data '{"jsonrpc":"2.0","method":"eth_chainId","params":[],"id":1}' \
  http://10.1.1.4:8545  # From any Besu node to East US
```

### Expected Results
- ✅ All peerings show `peeringState: "Connected"`
- ✅ Ping tests show 0% packet loss
- ✅ RPC calls return valid JSON-RPC responses
- ✅ Cross-VNet communication works

## Next Steps

1. ✅ **Full-Mesh Peerings**: Created (30 peerings)
2. ⏳ **Wait for Propagation**: Allow 1-2 minutes for all peerings to fully initialize
3. ⏳ **Test Connectivity**: Verify all VNets can reach each other
4. ⏳ **Test RPC Endpoint**: Verify https://rpc.d-bis.org responds correctly
5. ⏳ **Test P2P Discovery**: Verify Besu nodes can discover peers across regions

## Troubleshooting

### Peering Not Connected
If a peering shows `peeringState: "Initiated"` instead of `"Connected"`:
1. Check that the reverse peering exists
2. Wait 1-2 minutes for Azure to sync
3. Verify both VNets are in the same subscription

### Connectivity Issues
If ping/RPC tests fail:
1. Verify NSG rules allow traffic
2. Check that peerings are in `"Connected"` state
3. Verify VNet address spaces don't overlap
4. Check route tables (if custom routes exist)

---

**Status**: ✅ **Full-Mesh VNet Peering Complete**

All 30 bidirectional peerings have been created, enabling direct communication between all 6 VNets.

