The six class C address would mean you will have 6 different segments available to you with a subnet mast of 255.255.255.0
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VLAN's and Network address ranges
Hi all
I was hoping someone could quickly explain the two following items to me please. If you need more information about the questions then please do ask and I will add as much as I can or know.
1) We are having a new network installed the the Comms company have suggested we have about 12 different VLAN's. I dont understand why we would want our teachers on one vlan and students on another vlan and our printers on a third vlan. Please explain.
2) If I am told that I am going to get 8 x Class C address what does this mean. Also if I am provided with the following range what IP address am I going to get 192.168.1.0/24
Many thanks all.
F
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Answers
A VLAN is a way to handle network traffic on the same PHYSICAL routing devices/switches but on different LOGICAL (virtual) networks. In other words, if students are on one VLAN and teachers on another, the students can't snoop on the teachers' network traffic. Likewise, neither group can snoop on the printer traffic with a network sniffer.
A class "C" address is a block of numbers where the first 3 "octets" match.
192.168.1.0/24 = 192.168.1.0 through .255.
The first number (.0) is reserved for network identification and the last number (.255) is reserved for subnet broadcasts, so in reality, 254 numbers (1-254) are available for allocation.
If they are giving you 8 private class "C" private IP ranges, you're likely getting:
192.168.1.0/24
through
192.168.8.0/24
I, however, tend to avoid using 192.168 ranges for any organization such as a school because most home networks use 192.168.0.0/24 or 192.168.1.0/24.
I would suggest if they REALLY want to use 192 ranges, that they start with 192.168.101.0/24.
Hi All
Thank you very very much for the quick reply in this. Just before I close this question and award the points just one final item to clear. I understand why we would have VLAN's setup but although the students will not be able to snoop the teacher vlan using network sniffers but will they still be able to communicate with each other. I mean if a teacher has a share on her laptop and wants all the students to connect to it, will that work even though they are on two different vlans.
Thanks
The question as to whether the teachers and students will still be able to share depens on the type of network you have set up and whether or not routing is configured between the subnets. If this is a concern, make sure you check with the comms company. Sometimes people get a little carried away with "security" and sacrifice "convenience", so then users are forced to find even less secure ways of sharing data (like USB drives).
Generally speaking, it's likely that they will NOT prevent students from accessing the teacher's VLAN entirely unless they are asked to do so. If you ask the comms company whether or not the VLANs will all be "fully routed", and they answer "yes", that should solve the question.
It's probably worth pointing out that generally speaking, you should have a file server or two set up on your network and suggest that teachers put files they wish to share on the file server and have students get them from there. The average teacher is probably not going to understand enough of file system security and granting access for users to read files to avoid all the potential security issues that arise from sharing files off their laptops and only 10 remote users at a time would be able to connect a Windows XP or Vista workstation anyway.
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by: MessHallManPosted on 2008-07-03 at 10:34:11ID: 21927524
By separating the different users/devices into different VLANs you can limit what each VLAN can connect to in the router.
For the 192.168.1.0/24 that you mention you will have 192.168.1.1 to 192.168.1.254 available for use.