By default Mikrotik use the following LAN subnet, 192.168.88.0/24 with the gateway IP being 192.168.88.1.

For this example the Mikrotik's subnet is being changed to 10.0.0.0/24 with a gateway IP of 10.0.0.1.

There are six items that will be updated.

• Add the local address to the Mikrotik's Bridge-Local
• Add the new IP range to the Mikrotik's Pool
• Add the new address to the DHCP Network
• Change the DHCP Server to use the new Address Pool
• Change the DNS Static address
• Add the new address to the IP Service List's Available From address.

Add the Local Address

1. Open Winbox and go to IP
2. Go to Addresses
3. In the Address List window, click on the Blue Plus Sign to add
4. In the New Address window, select Address to type in the new address
5. Type in the new address: 10.0.0.1/24
6. Select the Bridge-Local Interface
7. Click OK
8. The new address now appears in the Address List 

Add the New IP Range

9. Go to IP
10. Go to Pool
11. In the IP Pool window, click on the Blue Plus Sign to add
12. Enter in a Name (e.g.: cust-pool)
13. Enter in the address pool range (e.g.: 10.0.0.10-10.0.0.99)
14. Click OK
15. The new IP Pool now appears in the IP Pool list 

Add the New Address to the DHCP Network

16. Go to IP
17. Go to DHCP Server
18. In the DHCP Server window, click on the Blue Plus Sign to add
19. Enter in the Address (e.g.: 10.0.0.0/24)
20. Enter in the Gateway (e.g.: 10.0.0.1)
21. Enter in the DNS Servers (e.g.: 10.0.0.1)
22. Click OK
23. The new netwoeks will now appear in the DHCP Server Networks list

Change the DHCP Pool

24. From the same DHCP Server, double click on "default" to change the Address Pool
25. Go to the Address Pool drop down menu and select the pool that was just created (e.g.: cust-pool)
26. Click OK
27. The new Address Pool is now selected for the DHCP server 

Change tge DNS Static Address

28. Go to IP
29. Go to DNS
30. From the DNS Settings window, click on Static
31. Select the default DNS Static entry by double clicking the entry
32. Change the address to the new Gateway IP (e.g.: 10.0.0.1)
33. Click OK
34. The new Address will now appear in the DNS Static list

Add the New Available From Address

35. Go to IP
36. Go to Services
37. From the IP Service List window, select the "www" entry by double clicking the entry
38. Click on the arrows to add a new entry
39. Enter the new subnet (e.g.: 10.0.0.0/24)
40. Click OK
41. The new Available From subnet will now appear on the IP Service List for the www service.