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http://www.trainsignaltraining.com/wpnew/wp-content/uploads/2008/04/Stelios_VLSM/5.jpg

I was wondering if this was close to what I need. I need to design an IP network for a small office with 4 subnets and 50 host addresses.

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Good approach is to start with requirements, pick a private block, then use VLSM to size each subnet. Assuming the exercise needs 4 subnets each supporting about 50 hosts (you said static IPs), the smallest mask that fits 50 usable addresses is /26 (62 usable). That means you can split a single /24 into four /26s and keep addressing simple and contiguous.

Example plan (one possible allocation):

Use 192.168.10.0/24 and split into four /26 subnets (mask 255.255.255.192)

192.168.10.0/26     usable .1  - .62   gateway .1
192.168.10.64/26    usable .65 - .126  gateway .65
192.168.10.128/26   usable .129 - .190 gateway .129
192.168.10.192/26   usable .193 - .254 gateway .193

You do not need four physical routers. As already warned, avoid hubs; use switches. As suggested, one router plus managed switches and VLANs is the usual, scalable choice. For inter-subnet routing either use a layer-3 switch or a single router with subinterfaces (router-on-a-stick) connected over a trunk to a managed switch. The number of physical switches depends on port counts and wiring closet layout, not on the number of subnets.

Because all addresses will be static, document everything: hostname, MAC, IP, mask, gateway, DNS, and a reserved block for servers/printers and growth. Consider DHCP reservations for devices that need fixed addresses but might move. Put the Internet-facing firewall/NAT on the edge router and keep production and guest/management networks separated. For private addressing guidance see RFC 1918: RFC 1918.

Small labs: build the config in a test switch/router first, verify routing and ACLs, then deploy.

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Member Avatar for jbennet

link is dead

Member Avatar for army88m2

Sorry about that. Could someone please steer me in the right direction about how to go about designing a network with 4 subnets and 50 IP addresses. I am totally lost here.

Member Avatar for jbennet

Using DHCP or static IPs?

Member Avatar for jbennet

odd, for some reason my reply somehow appeared above yours...

Member Avatar for army88m2

Static IP

Member Avatar for army88m2

So I am assuming that I need 4 routers, 2 switches, and 1 hub correct in order to complete this.

Member Avatar for jbennet

Dont use hubs, if switches are available. Hubs are slow and insecure.

I think you would only need a few routers

Why do you want 4 seperate subnets anyway?

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