# Add VLAN 11 Secondary IP - WSL2 Guide

**Last Updated:** 2026-01-15  
**Status:** Active Documentation
**System:** WSL2 (Ubuntu 24.04)  
**Purpose:** Configure machine to have both current IP and VLAN 11 IP

---

## Current Configuration

- **System:** WSL2 (Ubuntu 24.04.3 LTS)
- **Primary Interface:** eth0
- **Current IP:** 192.168.0.4/24
- **Target VLAN 11 IP:** 192.168.11.23/24
- **VLAN 11 Gateway:** 192.168.11.1 (✅ Reachable)

---

## Quick Setup (Immediate)

**Run these commands:**

```bash
# Add VLAN 11 IP address
sudo ip addr add 192.168.11.4/24 dev eth0

# Add route to VLAN 11 network
sudo ip route add 192.168.11.0/24 dev eth0 src 192.168.11.4

# Verify
ip addr show eth0 | grep "inet "
```

**Expected Output:**
```
inet 192.168.0.4/24 ... (current IP)
inet 192.168.11.23/24 ... (VLAN 11 IP)
```

---

## Using Scripts

### Option 1: Simple Script (Temporary)

```bash
sudo ./scripts/unifi/add-vlan11-secondary-ip-simple.sh
```

This adds the IP immediately but will be lost on reboot.

### Option 2: Auto-Configuration on Login (WSL2 Recommended)

```bash
# Add to ~/.bashrc for auto-configuration
./scripts/unifi/add-vlan11-ip-to-bashrc.sh
```

This will automatically add the VLAN 11 IP every time you log in.

**Or manually add to ~/.bashrc:**

```bash
# Add this to the end of ~/.bashrc
if [ -n "$(ip link show eth0 2>/dev/null)" ] && ! ip addr show eth0 | grep -q "192.168.11.23"; then
    sudo ip addr add 192.168.11.23/24 dev eth0 2>/dev/null || true
    sudo ip route add 192.168.11.0/24 dev eth0 src 192.168.11.23 2>/dev/null || true
fi
```

---

## Verification

After adding the IP:

```bash
# Check IP addresses
ip addr show eth0 | grep "inet "

# Should show both:
# inet 192.168.0.4/24 ... (current)
# inet 192.168.11.23/24 ... (VLAN 11)

# Test connectivity
ping -c 3 192.168.11.1   # VLAN 11 gateway
ping -c 3 192.168.11.10  # ml110
ping -c 3 192.168.11.11  # r630-01
ping -c 3 192.168.11.12  # r630-02
```

---

## WSL2 Notes

**Important for WSL2:**

1. **No netplan:** WSL2 doesn't use netplan by default
2. **No systemd:** WSL2 may not have systemd running
3. **Best solution:** Add to ~/.bashrc for auto-configuration on login

**Persistence Options:**

1. **~/.bashrc (Recommended):** Auto-configures on each login
2. **Manual:** Run commands manually after each reboot
3. **Windows Task Scheduler:** Can run a script on Windows startup

---

## Troubleshooting

### Issue: Cannot add IP address

**Error:** `RTNETLINK answers: File exists`

**Solution:** IP already exists, skip this step.

### Issue: Route already exists

**Error:** `RTNETLINK answers: File exists`

**Solution:** Route already configured, skip this step.

### Issue: IP lost after reboot

**Solution:** This is normal for WSL2. Use ~/.bashrc auto-configuration.

---

## Summary

**Quick Start:**
```bash
# Add IP immediately
sudo ip addr add 192.168.11.23/24 dev eth0
sudo ip route add 192.168.11.0/24 dev eth0 src 192.168.11.23

# Make persistent (WSL2)
./scripts/unifi/add-vlan11-ip-to-bashrc.sh
```

**Result:**
- ✅ Keep current IP: 192.168.0.4
- ✅ Add VLAN 11 IP: 192.168.11.23
- ✅ Access both networks simultaneously
- ✅ Auto-configure on login (if bashrc script used)

---

**Last Updated:** 2026-01-15