"But you cannot have the MX, to grab a WAN IP from say vlan 10, and let vlan 20 passthrough the MX Internet port, for upstream LAN access. In such case, you'll have to short VLAN 20 around to a LAN port on the MX, with another physical cable." This is what i wanted to achieve, then I´ll have to check and see if I can free up a LAN port on the switch. Thank you very much!
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