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uk.comp.home-networking (UK home networking) (uk.comp.home-networking) Discussion of all aspects of computer networking in the home, regardless of the platforms, software, topologies and protocols used. Examples of topics include recommendations for hardware or suppliers (e.g. NICs and cabling), protocols, servers, and specific network software. Advertising is not allowed.

More than 254 computers on a network?



 
 
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  #1  
Old May 10th 05, 11:10 AM posted to uk.comp.home-networking
John
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Posts: 3
Default More than 254 computers on a network?

Not that I need to do this, but if an IP address range only has 254 useable
addresses, (192.168.0.1 - 192.168.0.254)... How does an organisation with
more than 254 computers connect them to the network?

Cheers
John


  #2  
Old May 10th 05, 12:40 PM posted to uk.comp.home-networking
Rob Hemmings
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Posts: 17
Default More than 254 computers on a network?

"John" wrote in message
...
Not that I need to do this, but if an IP address range only has 254

useable
addresses, (192.168.0.1 - 192.168.0.254)... How does an organisation with
more than 254 computers connect them to the network?


By having more subnets and using a router/bridge to allow them all to
communicate with each other. E.g:

192.168.0.x ]
] bridge
192.168.1.x ]

HTH
--
Rob


  #3  
Old May 10th 05, 12:44 PM posted to uk.comp.home-networking
Paul D.Smith
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Posts: 287
Default More than 254 computers on a network?

Using a NAT or nested NATs. Search for "NAT" and you'll see how.

Paul DS.


  #4  
Old May 10th 05, 01:23 PM posted to uk.comp.home-networking
Alex Fraser
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Posts: 553
Default More than 254 computers on a network?

"John" wrote in message
...
Not that I need to do this, but if an IP address range only has 254
useable addresses, (192.168.0.1 - 192.168.0.254)... How does an
organisation with more than 254 computers connect them to the network?


An IP address range in the private address space can have up to 16,777,214
useable addresses (10.0.0.1 - 10.255.255.254). You just use a different
network address and subnet mask.

Of course, it is unlikely to be practical to have anything like that number.
The solution is to use multiple networks with routers joining them
together - essentially the same as the entire Internet, but on a smaller
scale.

Bridges do not create multiple networks; the example Rob gave is valid but
will not (by itself) allow one set of machines to talk to the other,
assuming both sets use a subnet mask of 255.255.255.0.

The routers can perform NAT as Paul DS suggested, but this is usually
neither necessary nor desirable. It is necessary with some domestic routers,
which would probably not be suitable anyway.

Alex


  #5  
Old May 10th 05, 04:04 PM posted to uk.comp.home-networking
Paul D.Smith
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Posts: 287
Default More than 254 computers on a network?

The routers can perform NAT as Paul DS suggested, but this is usually
neither necessary nor desirable. It is necessary with some domestic

routers,
which would probably not be suitable anyway.

Alex


Alex is quite right. I read "connect them to the network" as "connect them
to the internet" however I would add that you cannot expose the private
address space to the outside world so you probably will require some
NAT-like function to allow all your internal machines to surf to the outside
without each having to have their own "real" IP address.

Paul DS.


  #6  
Old May 10th 05, 04:32 PM posted to uk.comp.home-networking
Andrew Oakley
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Posts: 37
Default More than 254 computers on a network?

On Tue, 10 May 2005 13:23:44 +0100, "Alex Fraser"
wrote:

"John" wrote in message
...
Not that I need to do this, but if an IP address range only has 254
useable addresses, (192.168.0.1 - 192.168.0.254)... How does an
organisation with more than 254 computers connect them to the network?

An IP address range in the private address space can have up to 16,777,214
useable addresses (10.0.0.1 - 10.255.255.254). You just use a different
network address and subnet mask.


Yup - just to clarify for John, 192.168.x.x is not the only possible
IP range for internal networks.

RFC 1918 http://www.faqs.org/rfcs/rfc1918.html specifies the
following:

10.0.0.0 - 10.255.255.255 (16,387,064 addresses)
172.16.0.0 - 172.31.255.255 (1,032,256 addresses)
192.168.0.0 - 192.168.255.255 (254 addresses)

(The issue of whether 0 constitutes an addressable IP is contentious;
but for day-to-day use you are correct in presuming that it is not)

Alex and other people's comments about bridges, routers and NATs are
also correct. In addition to the 10. and 172.16. IP ranges, you can
also chain multiple smaller identically-addressed networks together
using Network Address Translation (NAT).

Most small internal networks use 192.168. and most large internal
networks, such as multinational corporates, use 10. I've only ever
seen a couple of 172.16. private networks.

--
Andrew Oakley andrew/atsymbol/aoakley/stop/com
  #7  
Old May 10th 05, 05:00 PM posted to uk.comp.home-networking
Conor
external usenet poster
 
Posts: 579
Default More than 254 computers on a network?

In article , John says...
Not that I need to do this, but if an IP address range only has 254 useable
addresses, (192.168.0.1 - 192.168.0.254)... How does an organisation with
more than 254 computers connect them to the network?

Use a subnet mask of 255.0.0.0 which will let you have 16 million IP
addresses.

www.learntosubnet.com


--
Conor

"Of all the things I've lost, I miss my mind the most." O.Osbourne.
  #8  
Old May 10th 05, 08:48 PM posted to uk.comp.home-networking
Ian Snowdon
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Posts: 17
Default More than 254 computers on a network?

In message , John
scribes
Not that I need to do this, but if an IP address range only has 254 useable
addresses, (192.168.0.1 - 192.168.0.254)... How does an organisation with
more than 254 computers connect them to the network?

Cheers
John


Use network:-
192.168.0.0/23 (subnet mask 255.255.254.0) gives 512 with 510 usable
192.168.0.0/22 (subnet mask 255.255.252.0) etc, etc

At work we use 10.235.n.0/20 where n = 0 or 16 or 32 and so on.
--
Snowy

  #9  
Old May 10th 05, 10:20 PM posted to uk.comp.home-networking
John Steele
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Posts: 62
Default More than 254 computers on a network?


10.0.0.0 - 10.255.255.255 (16,387,064 addresses)
172.16.0.0 - 172.31.255.255 (1,032,256 addresses)
192.168.0.0 - 192.168.255.255 (254 addresses)


192.168.0.0 actually has 16382 addresses not 255. It is usually subnetted
down to 256 separate networks with 254 addresses in each but there is
nothing to stop you creating a network with 510 addresses e.g. 192.168.2.0
subnet mask 255.255.254.0 (23 bits) or 1022 addresses or 192.168.0.0
255.255.252.0 (22 bits) etc.

John Steele


  #10  
Old May 11th 05, 10:45 AM posted to uk.comp.home-networking
Andrew Oakley
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Posts: 37
Default More than 254 computers on a network?

On Tue, 10 May 2005 22:20:59 +0100, "John Steele"
wrote:
10.0.0.0 - 10.255.255.255 (16,387,064 addresses)
172.16.0.0 - 172.31.255.255 (1,032,256 addresses)
192.168.0.0 - 192.168.255.255 (254 addresses)

192.168.0.0 actually has 16382 addresses not 255. It is usually subnetted


Whoops. I really shouldn't have made that mistake, what with running
192.168.7.xxx (the free WiFi hotspot I run for my neighbours) and
192.168.0.xxx (my private LAN) in my very own house. Thanks.

http://www.nam-vets.org/frampton


--
Andrew Oakley andrew/atsymbol/aoakley/stop/com
 




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