I’ve used RouterOS before, but always with the help/crutch of WebFig QuickSet preset configurations. I just picked up a CRS125-24G-1S-RM to replace the combination of a RB2011UiAS-IN and a dying unmanaged switch as my boundary gateway and core switch.
So the CRS125 is advertised as a “perfect SOHO gateway router, switch, all in one box”, which is what I’m looking for. Yay! But it comes out of the box configured as a pure switch. I need a kick start from the forum on how I should configure it to use one port for my external internet interface and the rest as my core switch, with NAT and firewalling between the two.
I’m spoiled because on the RB2001UiAS, I could just select the Home AP or WISP AP. One port was setup automagically as ether1-gateway and I understood how to go from there. I’m comfortable adding DHCP clients and servers, but not establishing the basic configuration.
For example, do I need to change one port setting its master port to None, removing it from the “switch” and opening it up to the router level features?
yes, set ether1 to master-port=none then attach dhcp-client on him, if your isp give you automatic settings, or set manually ip address, gateway, dns. then only need to set nat.
Thanks. Since ether1 is currently the master for all other ports, can I just set another port that’s currently a slave (say ether24) to master-port=none and use that as the WAN port?
It comes configured just as a switch. ether1 as the master and all others slaved to it. No routing, NAT, chains, or DHCP enabled.
Yes, you can set, for example, ether24 (or any ether port) to master-port=none and use that as the WAN port. Just put your dhcp client or pppoe (depending on your ISP) on ether24. Then a masq rule. The config will be similar to what you have on the RB2011 except the wan port is different.