Small router/switch

I need a router/switch with the following requirements:

- For my Co-lo to be able to host a couple of machines
- Just need a max of 5 ports
- need to be able to filter ports depending on IPs (will any switch do this or does it have to be a router ?)
- 100Mbps WAN (Could settle for 10 if big price difference)
- Currently using 100G/month and would like to be able to grow to 500G before having to switch equip.

When I look at the specs for my own little Linksys at home it seems it would be able to handle this. Is that a bad assumption ? Small router/switch

 

 

 

 

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