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Help Setting Up Subnets

I have an office with 15 separate networks.  Each network may only have a couple computers, but they are leased spaces, so we need to keep the works separate.  Right now, they are using s separate router for each office, which works, but it really makes a mess of the server room, and we would like to start bandwidth management to improve QoS.  So, I ordered an Linksys RV042, which I have used in the past and love it.  I am able to setup subnetworks, so each office will have it's own IP addresses, and will not be able to see other offices.  However, I did realize that the RV042, will not allow bandwidth management outside of it's main network.  So I started thinking about subnets.  I am not familiar with them and I am not ever sure if they will solve our issue.  How would I go about setting them up.  Right now our main network is 192.168.2.*.  Can I setup other network on the same address 192.168.2.*, but change the subnet mask to keep the network separate.  I am hoping with this will allow the RV042 to control the bandwidth, but the RV042 would be on subnet 255.255.255.0.  Thoughts?  Also, I thinking I could just move a wireless router into each office, so the tenant has wireless access to their individual network, and then I could set a static IP address on the router in the office to connect to the RV042 on the same 255.255.255.0 subnet and then I could bandwidth throttle the entire office suite.  Does any of this make sense to anyone?
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rlindbeck
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rlindbeck
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4 Solutions
 
svgmucCommented:
You can easily divide 192.168.2.0/255.255.255.0 into smaller subnets.
You just need to choose a netmask to do that.

For example, 255.255.255.240 will give you 14 hosts per subnet, plus 1 network address plus 1 broadcast address.

You may want to read up on netmask calculation or use a netmask calculator program.
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enriquecadalsoCommented:
Here you have an online calculator http://www.subnet-calculator.com/
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rlindbeckAuthor Commented:
So how would I setup the computers and would the router see Ip 192.168.2.100 if it is on a different subnet, so I can throttle it?  Thanks.
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DLeaverCommented:
If you only require a small number at each office you could purchase a switch like a Linksys SLM248G and setup VLANS for each seperate subnet.  Set the RV042 as the default gateway and therefore utilising the bandwidth features required and ensuring users don't cross over
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rlindbeckAuthor Commented:
Is it complicated to setup the Vlan on that switch?  Also, with a vlan, I can say IPs 192.168.2.5-7 are in one vlan, correct?  The am I able to allow that vlan to access one IP address (say a printer) outside the vlan, so all the offices could print to a shared printer?  Thanks.
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svgmucCommented:
The router would see all of them, while you're subnetting. But the VLAN is a better alternative, since subnetting wouldn't prevernt people from sniffing traffic of other offices.
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DLeaverCommented:
VLANs are dead simple on this switch, its got a nice gui which allows you to adjust VLAN memebership using drop down boxes.

Best practice would dictate that seperate VLANS should be on seperate subnets, not essential though.  If your are printing to a single printer then that port needs to be trunking and the printer should be 802.1q compatible (trunking protocol) and your router should support inter vlan routing too, I don't see that option on the RV042 so you may have to look into this
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rlindbeckAuthor Commented:
Thanks for your help everyone!
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