I want to replace an old DLink business router with a mikrotik router.
On the old one there are a lot of rules (LAN, DMZ1, DMZ2).
That the work is not interrupted for long time I thought I connect the new one to the modem and then I connect the old DLink router to the mikrotik. Can I set a rule on the mikrotik that the whole traffic will be forwared to the old DLink router (a kind that the mikrotik router is in transparent mode and the DLink get all requests from outside) while I configure the DMZ1, DMZ2, and so on?
Yes it is. You can use the router in bridge mode or as switch if it is equipped with switch chip. But you should rather try to configure it and if you fail then put back the old router and return back to try it again when you learn what was wrong.
I have a RB2011. Where can I find a tutorial for the bridge mode?
Can I set one of the ports to bridge mode and on the second switch (5 gigabit ports) can I configure the DMZ while the rest works over the old DLink router?
There is wiki documentation with examples, you should read it. I don’t know any step by step tutorial that would show you how to set exactly your configuration. Read about bridges and switches and then try it.
There are clear examples how to make bridge. I told you that I don’t know any step by step guide for your exact situation but I am sure you can try and learn…
The DFL products were good products (my DFL-700 ran 11 years).
But the RouterOS has more features and it’s better to configure than a OpenWrt based Firewall.
I only miss the OpenVPN UDP and compression feature in RouterOS.