Sorry..I'm new here and I'm still a beginner in mikrotik,
I hear can use GNS3 + qemu as a simulator, is it true?

But why when I use qemu, then setting firewall, interface, ip and then I save but the next day, I want to run it again and everything I've set up even disappeared..

please help me

Yes, It's true. Your setup is disappeared due to the license isn't a licensed version.
How to get the licensed version, see it here.

https://l.facebook.com/l.php?u=https%3A ... bBZ3nhZgFK

I can't input the key in qemu, because there is no explain how to input the key from auto typing

What key do you mean? RouterOS in virtual machines has no keys. Did you install CHR version?
Follow the steps carefully, don't miss some of them:

viewtopic.php?f=2&t=99658

What key do you mean? RouterOS in virtual machines has no keys. Did you install CHR version?
Follow the steps carefully, don't miss some of them:

viewtopic.php?f=2&t=99658

thank you

but I have one question, I already setting the address, DNS form the mikrotik, I make DNS Server setup to give automatic IP and then in "Routes" I used IP my modem, the status reachable ether1, but I can't ping that IP modem from my winbox use GNS3

please help me..because of so many forums, it's just here that it gives a lot of solutions