I have Mikrotik 450g Router , i need to config and provide to customer Public Ip , i have WAN IP : 123.xxx.117.77/30 ( Wan Public Ip) (123.xxx.117.78 Getway) and Lan IP : 123.xxx.119.192/29 now i put Wan ip in wan Port in 450G and eth1 give 192.168.1.1/24 this configuration working good but i need to provide Public Lan ip to Customer for ex: 123.xxx.119.192/30
I would not split those public IP into smaller subnet because you have so few of them.
I would assign this 123.xxx.119.193/29 to the eth interface the customer is on tell them which two they can have from that range you have 194-198 left over.
Make sure you exempt 123.xxx.119.193/29 from NAT and Firewall.