Alias IP Setup and External Address #1422

[Mahmoud El Tabarane (Mr.T)]

## Network Setup and Coturn Configuration Issue

### Current Setup

**Video Back End Server:**
- **Actual IP:** `172.17.198.25`
- **Alias IP for VLAN:** `10.9.147.71`
- **Port Mirror APN:** `172.17.172.179`

**Coturn Server Address:**
- **Actual IP:** `172.17.198.22`
- **Alias IP for VLAN:** `10.9.147.72`
- **Port Mirror APN:** `172.17.172.159`

### Clients

1. **First Client Machine (From Port Mirror Network)**
   - **IP:** `10.250.200.91`
   - **Connection Path:** Backend via `172.17.172.179`
   - **Coturn Config:** `EXTERNALIP=172.17.172.179/172.17.198.25`
   - **Status:** Video works perfectly

2. **Second Client Machine (From VLAN Network)**
   - **IP:** `10.2.22.241`
   - **Connection Path:** Backend via `10.9.147.71`
   - **Coturn Config:** `EXTERNALIP=10.9.147.71/172.17.198.25`
   - **Status:** Video works perfectly

### Coturn Configuration

```ini
# STUN APN WAN to SRV LAN
external-ip=172.17.172.159/172.17.198.22
external-ip=10.9.147.72/172.17.198.22
# WWAN
#external-ip=172.17.172.159/10.250.200.130

# Backend VLAN Map
external-ip=10.9.147.71/172.17.198.25

# Backend PortMirror Map
#external-ip=172.17.172.179/172.17.198.25

listening-ip=0.0.0.0
```
### Issue
When both `EXTERNALIP` addresses are configured in Coturn, neither client setup works. The goal is to have both client types operational simultaneously. The custom WebRTC service can only use one STUN address or switch to another if the first one is down.

### Seeking Solution
Looking for a solution or confirmation if this setup is feasible with the current network and Coturn configuration.