# Azure  - Network Cost Guide

## Document Purpose

This document gives some sample cost estimates for select network access methods and provides the URL's to find current pricing. 

## Network access methods 

1) Internet Gateway - used with public IP
2) NAT Gateway - used with private or public IP
3) CFS Transit Gateway (VPN) - used with private IP address, VPN connects back to CU Boulder

### Internet Gateway

```{Important}
Always check [Microsoft documentation](https://azure.microsoft.com/en-us/pricing/details/bandwidth/) for current pricing.
```
 
**Network costs**

1) Downloads - no cost

2) Uploads - first 100GB/month is free, tiered cost per 1GB transferred after

**Sample Network Cost**

2 Servers will download 100GB and upload 500GB in a month.

	1) Download cost = $0
	2) Upload cost = (100GB = $0) + ($0.087 x 400GB) = $34.80

	Total Network Cost = $34.80/month

### NAT Gateway
```{Important}
Always check [Microsoft documentation](https://azure.microsoft.com/en-us/pricing/details/virtual-network/) for current pricing.
```

```{Important}
The CFS NAT Gateway will be deployed into subscriptions unless we are told otherwise. If you do not want to be charged for this and you do not require public internet access from your Azure environment, please contact rc-help@colorado.edu.
```

**Network Costs**
1) Downloads - $0.045/GB
2) Uploads - $0.045/GB
3) NAT Gatway Resource - $0.045/hr
4) Public IP Resource - $0.0036/hr

**Sample Network Cost**

2 Servers on the same subnet will download 100GB and upload 500GB in a month.  The NAT gateway will be on the entire month.

	1) Download cost = $0.045 x 100 = $4.50
	2) Upload cost = $0.045 x 500 = $22.50
	3) NAT Gateway Instance = $0.045 x (24hr x 30day = 720hr) = $32.40
	4) Public IP = $0.0036 x (24hr x 30day = 720hr) = $2.60

	Total Network Cost = $62.00/month

Creating another NAT Gateway without public internet access would incur the same costs with the exception of the Public IP for:

	Total Network Cost = $59.40/month

### CFS VNET Peering (VPN)

```{Important}
Always check [Microsoft documentation](https://azure.microsoft.com/en-us/pricing/details/virtual-network/) for current pricing.
```

**Network Costs**
1) Downloads - $0.01/GB
2) Uploads - $0.01/GB

**Sample Network Cost**

2 Servers will download 100GB and upload 500GB in a month.  The VPC attachment will be on the entire month.

	1) Download cost = $0.01 x 100 = $1
	2) Upload cost = $0.01 x 500 = $5

	Total Network Cost = $6/month