# Namespace + VRF Summary

> Enterprise Network Isolation for NexusGuard SD-WAN — Reference Architecture

## Executive Summary

This document provides a high-level summary of the Namespace + VRF architecture for enterprise-grade network isolation in NexusGuard.

## Key Concepts

### 1. Network Namespace

**What:** Complete network stack isolation at kernel level

**Benefits:**
- Isolated network interfaces
- Isolated routing tables
- Isolated nftables rules
- Isolated socket bindings

**Use Case:** Multi-tenant SD-WAN, compliance isolation

### 2. VRF (Virtual Routing and Forwarding)

**What:** Routing table isolation within a namespace

**Benefits:**
- Multiple routing tables per namespace
- Same IP across different VRFs
- Policy routing support

**Use Case:** Development/testing isolation, network segmentation

### 3. Multi-User API Access

**What:** Role-based access control per namespace

**Benefits:**
- Multiple users per namespace
- Different permission levels (admin, operator, viewer)
- Audit trail per user

**Use Case:** Enterprise deployments, team collaboration

## Architecture Overview

```
┌─────────────────────────────────────────────────────────┐
│  Linux Kernel                                            │
│                                                         │
│  ┌──────────────────────────────────────────────────┐   │
│  │  Default Namespace (root)                        │   │
│  │    └── eth0, wg0 (server mgmt)                  │   │
│  └──────────────────────────────────────────────────┘   │
│                                                         │
│  ┌──────────────────────────────────────────────────┐   │
│  │  Namespace: ns_zerocode                          │   │
│  │    ├── VRF: vrf_main (table 100)                │   │
│  │    │     └── wg-z-main (10.100.0.1/24)          │   │
│  │    │           ├── Device A: 10.100.0.2         │   │
│  │    │           └── Device B: 10.100.0.3         │   │
│  │    └── nftables (isolated rules)                 │   │
│  └──────────────────────────────────────────────────┘   │
│                                                         │
│  ┌──────────────────────────────────────────────────┐   │
│  │  Namespace: ns_alice                             │   │
│  │    ├── VRF: vrf_main (table 100)                │   │
│  │    │     └── wg-a-main (10.100.0.1/24) ← SAMA! │   │
│  │    │           ├── Device C: 10.100.0.2         │   │
│  │    │           └── Device D: 10.100.0.3         │   │
│  │    └── nftables (isolated rules)                 │   │
│  └──────────────────────────────────────────────────┘   │
└─────────────────────────────────────────────────────────┘
```

## Document Index

| Document | Description | Key Topics |
|----------|-------------|------------|
| [architecture.md](architecture.md) | Main architecture document | Concept, data model, API design |
| [quick-reference.md](quick-reference.md) | Kernel commands cheat sheet | Namespace, VRF, WireGuard commands |
| [comparison.md](comparison.md) | Comparison with current architecture | Pros/cons, use cases, decision matrix |
| [implementation-guide.md](implementation-guide.md) | Step-by-step implementation | Database, API, testing, deployment |
| [troubleshooting.md](troubleshooting.md) | Troubleshooting guide | Common issues, debugging, logs |
| [security.md](security.md) | Security considerations | Isolation, attacks, compliance |
| [performance.md](performance.md) | Performance considerations | Overhead, benchmarks, optimization |

## Key Features

### 1. Complete Isolation

```
✅ Network interfaces (per namespace)
✅ Routing tables (per VRF)
✅ nftables rules (per namespace)
✅ Socket bindings (per namespace)
✅ API access (per namespace)
```

### 2. IP Conflict Prevention

```
✅ Same IP across different namespaces
✅ Same IP across different VRFs
✅ Automatic isolation
✅ No manual configuration
```

### 3. Multi-User Access

```
✅ Role-based access control
✅ Multiple users per namespace
✅ Admin, operator, viewer roles
✅ Audit trail per user
```

### 4. Compliance Ready

```
✅ PCI DSS isolation
✅ HIPAA data isolation
✅ SOC 2 monitoring
✅ Audit logging
```

## Implementation Timeline

| Phase | Description | Duration | Status |
|-------|-------------|----------|--------|
| Phase 1 | Database schema | 1 week | Not started |
| Phase 2 | Namespace manager | 1 week | Not started |
| Phase 3 | VRF manager | 1 week | Not started |
| Phase 4 | WireGuard integration | 1 week | Not started |
| Phase 5 | Firewall integration | 1 week | Not started |
| Phase 6 | API gateway | 1 week | Not started |
| Phase 7 | Dashboard UI | 1 week | Not started |
| Phase 8 | Testing & documentation | 1 week | Not started |
| **Total** | | **8 weeks** | |

## Resource Requirements

### Small Deployment (< 10 users)

```
CPU: 2 cores
RAM: 4GB
Network: 1Gbps
Storage: 50GB
```

### Medium Deployment (10-100 users)

```
CPU: 8 cores
RAM: 16GB
Network: 10Gbps
Storage: 200GB
```

### Large Deployment (100-1000 users)

```
CPU: 32 cores
RAM: 64GB
Network: 40Gbps
Storage: 1TB
```

## Performance Impact

| Metric | Current | Namespace + VRF | Overhead |
|--------|---------|-----------------|----------|
| Memory per user | ~10KB | ~1.1MB | +10x |
| Routing latency | ~0.1ms | ~0.2ms | +100% |
| Throughput | ~950Mbps | ~900Mbps | -5% |
| Setup time | ~5ms | ~15ms | +200% |

## Security Guarantees

| Aspect | Isolation Level | Notes |
|--------|-----------------|-------|
| Network interfaces | HIGH | Complete per namespace |
| Routing tables | HIGH | Complete per VRF |
| nftables rules | HIGH | Complete per namespace |
| Kernel | LOW | Shared |
| Filesystem | LOW | Shared |

## Use Cases

### 1. Multi-Tenant SD-WAN

```
Company A → ns_company_a → vrf_main → wg-a-main
Company B → ns_company_b → vrf_main → wg-b-main
Same IP, complete isolation!
```

### 2. Development/Testing

```
Developer → ns_dev → vrf_dev → wg-dev
QA Team → ns_qa → vrf_test → wg-test
Same IPs, no conflicts!
```

### 3. Compliance Isolation

```
PCI DSS → ns_pci → vrf_pci → wg-pci
HIPAA → ns_hipaa → vrf_hipaa → wg-hipaa
Isolated workloads!
```

## Decision Matrix

### Choose Current Architecture If:

- [ ] Single tenant deployment
- [ ] Simple network requirements
- [ ] Limited resources
- [ ] Quick time-to-market
- [ ] Low complexity tolerance

### Choose Namespace + VRF If:

- [ ] Multi-tenant deployment
- [ ] Strong isolation requirements
- [ ] Compliance needs (PCI DSS, HIPAA)
- [ ] Same IP across tenants
- [ ] Role-based API access

## Next Steps

1. **Review** — Read all reference documents
2. **Decide** — Choose architecture based on requirements
3. **Plan** — Create detailed implementation plan
4. **Implement** — Follow implementation guide
5. **Test** — Verify isolation and performance
6. **Deploy** — Roll out to production

## References

- Linux Network Namespaces: `man ip-netns`
- Linux VRF: `man ip-link` (vrf type)
- WireGuard: `man wg`
- nftables: `man nft`

---

**Status:** Reference architecture — not yet implemented
**Last Updated:** 2026-07-10
**Author:** NexusGuard Team