advice Question

Ideas to separate different businesses on the same LAN.

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WORKS2011Flag for United States of America asked on
NetworkingSecurityHardware Firewalls
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COVID seems to have disrupted many office buildings security where we're finding a theme playing out over and over. A business center once full of business now sits half empty and ends up getting subleased. Three or four businesses move into the vacant spaces. Sadly, business landlords only hook a Spectrum cable modem up (or ISP equivalent) then connect it to the patch panel. This places the subleased businesses at risk for several reasons. Everyone shares the same LAN network, risk of a virus breakout is high, there isn't a business grade firewall, just the basic cheap Spectrum modem device. Wireless is weak too, everyone shares the same password. 

Some business landlords are easy to work with while some insist they are not involved and accountable, the network they've provided (mentioned above) comes as is. 

With all this said, what do other EErs recommend to protect a business subleasing in a situation like this? We're thinking of a router with routing capabilities placed in our clients office to route to a different LAN, another device to create a VLAN, where do awe get DNS/DHCP from. 

David Johnson, CD
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