We are trying to come up with a new addressing scheme for our network. Does anyone have any reason not to use a /24 and setup multiple VLAN's and route between them when necessary? For example, maybe I have 10 VLAN's for PC's all with a max of 254 hosts. Then I have 10 VLAN's for IP phones all 10 VLAN's would have a differnt IP scheme. Would it become a routing nightmare? Would we be better off to have larger VLAN's and sacrafice some readability of the IP address (by that I mean being able to look at the IP address and know which VLAN and location the IP address is from). We plan to have all routing stay within the switching infrastructure rather than leave the switch to hit a router only to be routed back to a differnt port in the switch. Any help would be appreciated!
We use IP Addressing like this
â¢ The first octet, 10., is just the class A private IP address block we choose for our network.
â¢ The second octet, 10.X., is to designate which office or building the IP address range is assigned to.
a. Main Site - 10.1.0.0
b. Site 2 - 10.2.0.0
c. Site 3 - 10.3.0.0
d. Site 4 - 10.4.0.0
â¢ The third octet, 10.X.X., is to designate the VLAN the IP address is a part of.
a. VLAN 1 is Network equipment (routers, switches, etc.)
b. VLAN 3 Lets say is for Servers
c. VLAN 5 Lets say is for Printers
d. Desktop and Laptop VLANS are assigned based on floor of the building. We add 100 to the floor number and we get the VLAN ID based on that, for example, the third octet for 18th floor would be 118, so a user in site 2 would be 10.15.118.X
e. VoIP VLANS are assigned based on floor like the Desktops and Laptops except we add 200 to the floor number. (so that means no floors over 54)
â¢ The fourth octet, 10.X.X.X, is assigned manually or by DHCP depending on the type of equipment.
Here are some examples:
1. 10.3.3.55 - this is a server in Site 3 in VLAN3 and it is either named.
2. 10.2.118.54 -This is a workstation in Site 2 on the 18th floor in VLAN118.
3. 10.2.218.64 - This is a VoIP Phone in Site 2 on the 18th floor in VLAN218.
4. 10.4.5.20 - This is a printer in Site 4 in VLAN5.
5. 10.3.1.1 - This is a piece of network gear in Site 3 and is in VLAN1
Hope that helps,