Source NAT with Multiple Public IP Address

Today we will show you how to configure Source NAT with Multiple Public IP Address detail as bellow:
*Public IP
IP Address: 203.217.169.42 - 203.217.169.62 /26
Subnet mask: 255.255.255.192
Gateway: 203.217.169.1
DNS: 8.8.8.8, 8.8.4.4

*LAN: 192.168.1.0/24

We have 60 PCs on this network. We determine that 3 PCs will use with 1 Public IP Address. 
Example:
IP Address: 192.168.1.100, 192.168.1.101, 192.168.1.102 will go through 203.217.169.42
IP Address: 192.168.1.103, 192.168.1.104, 192.168.1.105 will go through 203.217.169.43
IP Address: 192.168.1.106, 192.168.1.107, 192.168.1.108 will go through 203.217.169.44

In this configuration we use MikroTik RouterBOARD 1100Dx4 with Firmware v6.42.3
1. Comment Interface

2. Create Bridge LAN

3. Configure IP Address for WAN

4. Configure IP Address for Bridge LAN

5. Configure DNS Server

6. Configure DHCP Server

7. Configure Static Route

8. Create Address Lists

9. Configure NAT and Source NAT to Specific Public IP Address

10. Add Port to Bridge LAN