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Network Design for Office w/multiple Tenants

Posted on 2014-03-30
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Last Modified: 2014-05-03
Hello,

We are moving to new building where we are going to be sharing an Internet Connection with 3 other companies. Now, each company will have their own internal network (pcs/servers), but we will all be sharing a high speed fiber internet connection. What do you think I should consider when setting up this network? I proposed a main Firewall which would handle the connection from the ISP. From there, I was thinking about a Cisco 3560 L3 switch as the main VLAN gateway which each company having its own VLAN. Each company would have their own Cisco 2960's which connect back to the 3560.

Let me know your thoughts.
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Question by:Cobra25
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by:pgm554
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Static IP's?

Layer 3 is a bit of over kill.

A UTM like Watchguard or Sonicwall could do your vlan's directly and eliminate the need for a master switch.

A smart layer 2 switch vlan would do just as well.
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by:Cobra25
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Yes I would give them their own public static IP not really a requirement at this point though.

I was thinking of having a Core design with a L3 switch and then just have it span out to each company with their own L2's
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by:Akinsd
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Your concept is on track

You won't need a public IP each for all three companies since they will be going out through 1 connection. If you however want their traffic identified separately on the internet, then you can create a sub interface for each company on the firewall's internet facing port and assign separate public IPs to each sub interface. You will then NAT each traffic through the desired public IP
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by:Cobra25
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Akinsd

I plan on using Cisco ASA 5510

I should have about 16 public IPs, i would like each company to have their own public IP. Do you see any issues
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by:Akinsd
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You will need to call your ISP. The only thing to worry about is communication (route), otherwise, there shouldn't be any issues if NAT is properly configured
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by:pgm554
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Are you running Exchange or any other static IP hungry apps?
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by:Cobra25
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Nope

not at all, just like to keep things segregated
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by:pgm554
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I would forget the l3 switch,use the ASA to do VLAN's into separate L2 switches and be done with it.

Personally ,I would consider the use of a UTM appliance with a subscription.
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by:Cobra25
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pgm554 thats an interesting thought

There maybe up to 7-10 companies that may join. Wouldnt i be limited on ports
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by:Andrew Davis
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As has been said, if it is just 3 tenants then this is commonly supported by UTM devices (Watchguard, Sonicwall, or UnTangle) however if you are looking at possibley going out to 10 or more then i would be agree that VLAN switches are the way to go.

With Public IP's. Whilst you are not planning on having any internal exchanges, or devices that require external port redirection, i think it would be a good idea to allow for it, by having each tenant having their own public IP so that they can, if the day comes, have their own port redirection.

Especially if each tenant is going to be responsible for their own LAN, and you are not managing all of the internals.
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by:Cobra25
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Why is UTM recommended in this scenario? Price?
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pgm554 earned 500 total points
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UTM's do a lot of nice things,they filter out malware sites and exploits,as well as email virus.

http://www.watchguard.com/products/xtm-software/overview.asp

You can do a Watchguard for under $500 bucks with 1 year sub.
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