how to subnet in a useful way

25 pts.
Tags:
Network
Networking
Subnets
sir, I am in a engineering college. In this we 25 labs each with 35 systems. we have one internet server.Each lab with unique workgroup name. For example if the system in lab1, the workgroup name is lab1 for all systems in the lab1. We have one internet server with two nics eth0 for isp and eth1 for private. Earlier we hve only 15 labs so eth1 address is 192.168.0.1 with subnet 255.255.240.0 Each lab we gave for example lab1 all the systems with 192.168.1.x with 255.255.255.0 and lab2 192.168.2.x with 255.255.255.0 gateway address we gave is 192.168.0.1 i.e is eth1 address. Now we increased our no of lab as 25 Earlier it was 15 so eth1 address is 192.168.0.1 with 255.255.240.0 So we want change from 192.168..x.x series to 10.x.x.x series Now what ip and subnet address have i to give for eth1 and what ip and subnet addresses have to give for 25 labs briefly i want to tell eth1 - 192.168.0.1 with 255.255.240.0 labname ip subnet gateway workgroup name lab1 192.168.1.x 255.255.255.0 192.168.0.1 lab1 lab2 192.168.2.x 255.255.255.0 " " lab2 . . .. Lab15 192.168.15.x 255.255.255.0 " " lab15 The reason why i want to give the above way one who opens my network places in the desktop , he should only able to get all the systems in the particular lab not able to get systems with other lab. If any body share any folder or drive in one lab it should be accessed only in the particular lab , It should not access or view from other labs But all the systems should ping to the gateway address. So now i want to change ip addresses and subnet from 192.168.x.x to 10.x.x.x similiar fashion . Please help me what address i have to give for eth1 and subnet and labs? Thanks in advance
ASKED: December 26, 2007  9:29 AM
UPDATED: January 1, 2008  11:57 AM

Answer Wiki

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Go to <a href=”http://www.solarwinds.com/downloads/”>Solar Winds</a> bottom of the page you will see their advanced subnet calc. Downlaod install and use. This way you will understand how subneting works as apposed to someone just throwing you the answer.

This tool is great you can adjust mask, mask bits, host bits, number of subnets, hosts per subnet and then generate the list.

If you want to know how and write the list out manually see this <a href=”http://articles.techrepublic.com.com/5100-1035_11-6089187.html?tag=sc”>link</a> for some great advice

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  • Jpd
    Dear Sir, Thank you for replying my query. I have gone through what ever link u mentioned. I am struggling while implementing. I am new in the networking field. You people are the experts. You can easily and directly answer my query because you might have experienced same type situation My question have three parts 1. I want to change from 192.168.x.x to 10.x.x.x 2.The total no subnets earlier it was 15 and now 25. 3. There should not be no file and device sharing between the systems in the subnet. But they can able to access the gateway so what whould be my gateway ip address and subnet in 10.x.x.x series for eth1 Pleae Analyse my problem and answer me directly Thank you
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  • Jajati
    Use subnet mask of 255.255.255.0 against 10.0.0.0 net work. the subnets will be 10.0.1.x, 10.0.2.x, 10.0.3.x and so on.......every subnet you can have 254 nodes, and you can also have options to extend your network. Give the eth1 address 10.0.1.1 255.255.255.0, start lab1 addresses with 10.0.2.x. Hope it helps you..........
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  • Jpd
    Dear sir, Thank u for ur nice and immediete reply. I understood and will follow , then i will inform what will happen. Finally shall i change small modification, if i modify what will happen? You said that for eth1 10.0.1.1 with 255.255.255.0 and asked to start lab1 with 10.0.2.x Instead of that for eth1 if i give 10.0.0.1 with 255.255.255.0 and start lab1 with 10.0.1.x, shall i get same result whatever you mentioned? are both same ? Please answer this basic doubt.
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  • Jajati
    Actually theoritically while subnetting the first subnet (i.e. 10.0.0.x with /24) should not work.....but practically it works (you can start with 10.0.0.x).
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