SG-2220 - VLANs on the WAN side?
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I got SG-2220, which only has two ports - LAN and WAN. I want to create connectivity redundancy by adding a mobile hotspot as emergency fail-over option. Since there is only one WAN port, can I get VLAN capable switch (like edgerouter lite, etc) and run cable modem and mobile hotspot into it, then connect one port to pfSense WAN port?
I could setup VLANs on the router, and add corresponding VLANs on PfSense. Does this setup make sense? Would it work?
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Yes. You can have VLANs on WAN going to an outside switch to two or more different providers.
pfSense: vlan 100 vlan 101
Switch: tagged port vlans 100 and 101 to pfsense, untagged 100 to ISP 1 modem, untagged 101 port to ISP 2 modem.
It will be functionally equivalent to having two different WAN interfaces.
You will have to understand that powering off and on one of the modems won't trigger a DHCP renewal event on pfSense because the port will not go down from its perspective. You might have to release renew manually, etc, if that ever arises.
