conectar dos redes

Hola Angel and welcome to the UTM Community!

I assume that these two networks are both local to the UTM - correct?  WebAdmin will create the necessary routes automatically between networks defined on the UTM's interfaces, so you only need to create firewall rules to allow the traffic you want.  Don't forget the masquerading rule for each network.

Cheers - Bob

PS I like to see folks post in their native language, but since English is the second language for many here, it's also friendly to post the Google Translate so that everyone doesn't have to do it themselves.  If someone does use Google, I find it easier to understand most translations when I also can see the original language - more information is better than less!  Although I can read enough Spanish to have understood your post, here's what I got from Google for your post above:

connect two networks

I have network A 192.168.1.0/24 255.255.255.0 with 210 network devices and another floor has been built where 300 network devices will be installed (PC, laptops, telephones, printers, etc.) and I want to connect the network B 192.168.2.0/23 255.255.254.0 to utm9. I want network B to be able to connect to network A and use servers, the internet and other.

Yes, they are local UTM. i'll try crreating the rules.

thanks.