@rterren On your OPT port, you have to first enable it, give it a static IP address with a /24 subnet mask. Don't assign a gateway.
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Then, under Services -> DHCP Server, find that interface, and turn on the DHCP server function. You need to specify a range, a start address and an end address in other words, but that's pretty easy.
That's all there is to it. If you plug say, a laptop, into the LAN port, you should get an IP address from that range. Then, if you plug the same laptop into the OPT port, you should get an address in the other range. 2 different IP ranges on the same pfsense box. You don't want to use the "additional pool" thing on your LAN network, that's not correct for this scenario.
No offense, but I wouldn't be too tempted to use the SG-1000 just because it's sitting on your desk. I found myself doing/thinking the exact same thing, but I ended up selling my SG-1000, because I couldn't come up with a good enough reason to keep it. Anything I could think of, I could easily do with the other boxes I've already got, the ones with all the extra network ports.
Jeff