One Router two domains, can I share internet connection and resources

I have one network. It has 2 physical domain controllers. One is primary with both DHCP and DNS installed. The other is a backup form Domain1.

I also have two hyper-v hosts. One primary and the other a fail-over cluster.
Virtual Servers Include 4 virtual 2008 servers r2:

1 Terminal Server (for sales people using CRM system)
1 MS SQL 2005 Database (for CRM and Accounting System.)
1 Phone System Application Server

I have room for 1 more virtual server. I was thinking to create a new virtual domain controller to create a separate domain for a new company that my wife is starting and call it Domain2. She will be renting the back offices from my company in the same building.

She will have two employees and herself. That is a total of 3 workstations on this new domain.

Is it possible to use one router (Sonicwall) to share the internet connection?

Also can the new Domain2 take advantage of all the printers available on Domain1? We have a common printer area.

And Finally if she buys her own accounting software that also runs on MS SQL, can she use the existing MS SQL server on Domain1? Or would we need a separate MS SQL Server on Domain2?

I want to keep everything as clean and simple as possible. I have a $1000 hardware/software budget in anything else is needed.
MEATBALLHEROAsked:
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Nagendra Pratap SinghDesktop Applications SpecialistCommented:
Yes you can.

How many ports does your router have LAN side?
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vivigattCommented:
There is no theoretical problem sharing a single Internet connection and even Databases.
I would however recommend using separate subnets for the two domains and routing them on the Sonic Wall. This implies the use of VLANs on the SonicWall, I don't know if this is doable. Anther way around is to add a small "gateway" that would perform NAT (Network Address Translation between domain 2 and the Sonic Wall. A Linksys WRT 54G is cheap and very good and can be used with an alternate firmware such as dd-wrt or open-wrt. This might be the simpler solution, you would separate both domains and yet be able to open some channels between them if need be.
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MEATBALLHEROAuthor Commented:
My router has 8 ports.
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