A simplified scheme.
m0n0 m0n0 Generic PC 1.3b18, 2 network cards
LAN - fxp0 IP 192.168.1.5/24
WAN - fxp1 IP 193.10.20.30 (static)
At the interface fxp1 (WAN port), creating a VLAN tag 20
This will be a OPT1 IP 10.24.1.250/24
The switch add port is connected to "WAN" on VLAN 20
Rules of the firewall to allow access from the LAN to the network OPT1.
And do not get access.
I do not understand where to look?
NAT?
In general, you can create a Vlan on the WAN port?
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Topic: Vlan on the WAN port?