When I route some IP address to Mikrotik, it starts all packet with NEW state. Clients are already connected with server and state is not NEW but Mikrotik thinks it is ne because not seen in connection table.
How do I pass already connected connection for mikrotik don’t marked with NEW?
You can’t.
If these are getting incorrectly dropped due to firewall rules, you should rethink your firewall configuration.
May before xx seconds I able to mark connection for recover connection before mikrotik routing process.
Than pass this marked connection from firewall rules.
But can’t find any schema about this idea. Do you have any?
OR is there any way to accept all traffic to a destination for xx seconds?
Yes you can do this with an address list - you can create a firewall rule that accepts traffic to a certain destination address list, and you can add an entry to the address list with a timeout, when the entry times out, it will be removed.