I've a setup for home hooked to a 760iGS running 7.19.4 that calls pppoe at eth1 and delivers dhcp to all devices on a switch at eth4. So far so good!
I've a few keystone wall plugs around the house for future (or not ?) wired connections like TV or whatever else it's necessary.
Due to a bunch of outages lately I'm about to set my starlink mini as 2nd link but I was wondering if it's possible to simply use one of these existing wired positions to hook the dish, with no need of creating a new wiring to another eth interface at the RB.
For that, RB would need to identify at it's ARP that the antenna Starlink is hooked at the switch and put it in a separately VLAN assuming that is a WAN connection and from there keep serving the dhcp for the regular bridge, all this mess under the same eth phisical port a the RB.
I'm pretty sure it is not the best option but it would be a spare solution to keep it online without messing all static distribution for cftv, nvr etc etc meanwhile. Turning the RB off and hooking SL to the switch brings internet to the wired devices but the dish isn't able do manage dhcp
Not sure what you mean?
Do you have an ethernet jack up in the attic near the roof that has cable leading to the router?
Were you planning on taking an existing wall jack upstairs and running an ethernet cable up to the starlink device?
Its best or simplest to simply use ether2 connected to the starlink, through whatever means possible.
A directly linked cable going into ether2 is the simplest.
If you want to start using an ethernet cable into the router with multiple streams of traffic, then you are talking vlans and somewhere between the router and the starlink you will need a managed switch for distribution purposes.
The link provided by tangent is the way to go. It would be MUCH simpler. SL would become a second WAN port. You'd only have to duplicate ETHER1 configs to ETHER2 (or whatever interfaces are used).
If I guessed right, you want to create a VLAN between the switch and the RB to carry the SL service only. That would work but I would urge you to use a "proper" way of vlanning as described here (https://help.mikrotik.com/docs/spaces/ROS/pages/328068/Bridging+and+Switching#BridgingandSwitching-BridgeVLANFiltering). You would have to make a few tests, but I would use the VLAN interface on the RB as the WAN port. Of course, the port chosen on the swicth is removed from the LAN.
Whatever option you choose, create an interface list called "WAN" and use that in your firewall section (an any other service using ports) instead of duplicating your filters.