Concentrator mode only uses WAN 1 port What's the goal with using both WAN ports on the MX? Just LAG/more bandwidth? As Philip mentioned no MX supports LAG. And the MX105 has 10Gbe capable WAN ports. Typically in this design the MX would sit behind your edge FW in a DMZ using a private IP. The FW would have a NAT rule and access rule allowing VPN through it/to the MX.
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