Can different law firms have computers on the same network

I guess this has to do with Hippa (or however you spell it)
I have a client that has several law firms residing in the same building. Currently they have their own internet connections/providers.
They'd like to consolidate to sharing a single ISP.
my question is, legally, in Texas, do I need to have them on separate subnets?
I'm thinking multiple static IP's on a Comcast gateway and routers installed for each firm (there are 4)
I also need to keep it simple since I'm not a Cisco certified engineer, or anything close to it. Usually I use business class netgear routers.

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James HIT DirectorCommented:
I would suggest you put them in different subnets and different VLANs. This will ensure the segregation of data between entities. You can then route each respective VLAN out the main ISP without any issues. This will require a managed switch and some knowledge, otherwise you can try your GW to router but you have to be careful to not double NAT traffic or your translations will never return to the correct path.
I would suggest you put them in different subnets and different VLANs. This will ensure the segregation of data between entities.
I have no idea what is legal in Texas, so from me - just technical part. Yes it can be done as it is suggested in Spartan's post, but it needs to be done very carefully since there are many configuration details to pay attention, otherwise simple network attack like mac flooding and there is no any privacy, or just one badly configured port on the switch is enough to compromise all networks. So if you want to keep it simple, I guess that's not the best course of action.
This will require a managed switch and some knowledge
Unfortunately, I think more than little knowledge is needed is this case (but in the end, it is always - some knowledge).

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bwierzbickiAuthor Commented:
Thanks for your replies. Sorry for the slow closing of this question. I thought I had closed it.  I'm going to have Comcast set up the gateway with multiple static ips with gateway in pass thru mode and separate routers.
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