WAN links using a managed switch on port of the modem

[daadune]

I'm trying to create 4 WAN ports to my OPNsense using a HP OfficeConnect switch and a VDSL2 modem (DMZ port).
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The idea is that I could get 4 different bridged connections which I might be able to NAT 1-to-1 some internal hosts. The modem has only 1 DMZ port, but my ISP offers 5 public IPs, which would be 1 for router and 4 for DMZ in this scheme.