subnetting

Mr-White

Mr-White

Mr-White

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can someone help me understand subnetting, all the googling i've been doing just brings up encyclopedia definitions and doesn't really explain enough or what i want to know :(

MW
 
Check out: http://www.learntosubnet.com/

I saw this site being recommended on here earlier in the year, and I used the lectures for my revision during my exams :)

It takes quite a while to get through them all, but personally found them really useful.

Enjoy ;)

SW.
 
subnetting as i understand it (and correct me if i'm wrong!) allows you to have more ip address available to use.

example, an ip address of 192.168.1.1 is a class c address. it has a sudnet mask of 255.255.255.0. this means that you can use ip addresses in the range of 192.168.1.0/255. thats 256 addresses!!

if you need more you can change the mask to 255.255.0.0 which would give you an ip address range of 192.168.0/255.0/255 thats 512 addresses. can you see where this is going.

i hope this helps.
tris
 
sorry!

i forgot to mention that the subnet masks the network id. so a subnet mask of 255.255.255.0 laid over an ip address of 192.168.1.1 means that the node/workstation id is the last octet (.1). changing the sudnet mask to 255.255.0.0 means you can use two octets to id the node.(1.1)

tris
 
33scott said:
subnetting as i understand it (and correct me if i'm wrong!) allows you to have more ip address available to use.

example, an ip address of 192.168.1.1 is a class c address. it has a sudnet mask of 255.255.255.0. this means that you can use ip addresses in the range of 192.168.1.0/255. thats 256 addresses!!

if you need more you can change the mask to 255.255.0.0 which would give you an ip address range of 192.168.0/255.0/255 thats 512 addresses. can you see where this is going.

i hope this helps.
tris
Click to expand...
]
It's not 512 - 255.255.0.0 is 65,536. 255.255.255.254 is 512 :)

Subnetting is a method of breaking down networks into smaller pieces, each appearing as an individual network. The subnet mask controls this....so with a mask of 255.255.255.0, 192.168.1.1 would be a different network to 192.168.2.1.

I had a look and Wikipedia has a great reference page - see here :)
 
33scott said:
if you need more you can change the mask to 255.255.0.0 which would give you an ip address range of 192.168.0/255.0/255 thats 512 addresses. can you see where this is going.
Click to expand...

More like 65536 addresses ;)
 
33scott said:
example, an ip address of 192.168.1.1 is a class c address. it has a sudnet mask of 255.255.255.0. this means that you can use ip addresses in the range of 192.168.1.0/255. thats 256 addresses!!

if you need more you can change the mask to 255.255.0.0 which would give you an ip address range of 192.168.0/255.0/255 thats 512 addresses. can you see where this is going.

i hope this helps.
tris
Click to expand...

surely 255.255.0.0 gives you 255*255=~65000 different possible ip addresses rather than 512?

//beaten to it, damn hospital server (my first maths in yrs ;) )
 
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