You basically set up a VLAN trunk port on the switch, and configure the single interface on your 2620 router to provide interVLAN routing via LAN sub-interfaces. How you do it depends on what kind of switch you are connecting the router to, either a switch running Cisco IOS or a switch running Cisco Catalyst OS. Here's two links:
Configuring InterVLAN Routing and ISL/802.1Q Trunking on a Catalyst 2900XL/3500XL/2950 Switch Using An External Router
I believe you can also use the keyword "Secondary" to add additional addresses to a single interface.
Use the same syntax for ip addr on the appropriate interface, adding the word "secondary" (no quotes) to the end.
Not a good way to set it up (multinetting an interface) but sometime you gotta do what you gotta do. If you were planning on using this router for a firewall, don't use this for a firewall ... your system is exposed.
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