Source NAT Masquerade. If you want to "hide" the private LAN 192.168.0.0/24 "behind" one address 10.5.8.109 given to you by the ISP, you should use the source network address translation (masquerading) feature of the MikroTik router.
Apr 15, 2018 Three different ways to configure source NAT on Mikrotik Aug 26, 2018 Network Address Translation (NAT) - RouterOS - MikroTik
What is IP Masquerade?
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src nat vs masquerade - MikroTik
Masquerade Firewall NAT action=masquerade is unique subversion of action=srcnat, it was designed for specific use in situations when public IP can randomly change - when public IP is dynamic. Every time an interface disconnects and/or its IP address changes, router will search and purges connection tracking from connections Oct 26, 2018 · The Mikrotik Wiki Entry Firewall NAT action=masquerade is unique subversion of action=srcnat, it was designed for specific use in situations when public IP can randomly change, for example DHCP-server changes it, or PPPoE tunnel after disconnect gets different IP, in short – when public IP is dynamic. Nov 06, 2013 · On the mikrotik your masquerade rule needs to be under the NAT tab, and you need to make sure it is the very last rule on the list otherwise it will interfere with certain traffic going through such as VPN tunnels if you have any configured. EDIT: Your rule should have the OUT interface designated as your WAN port.