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uk.comp.homenetworking (UK home networking) (uk.comp.homenetworking) 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. 
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#1
 
 
Technical question of networks  well for me anyway. Given I understand basic 8 octlet network addressing and subnets; can someone clarify the notation w.x.y.z/a for me. I've determined 'a' as a subnet number (does /16 gives me the whole range w.x.y.??) but what is the basis; is it always 0 OR a or is it in segments? I wonder if this notation is older than describing subnets themselves or a modern equivalent. Taa. 
#2
 
 
Technical question of networks "William4" wrote in message ...  well for me anyway. Given I understand basic 8 octlet network addressing and subnets; can someone clarify the notation w.x.y.z/a for me. I've determined 'a' as a subnet number (does /16 gives me the whole range w.x.y.??) but what is the basis; is it always 0 OR a or is it in segments? Written in binary, a subnet mask is n ones followed by 32n zeros. Therefore, a subnet mask can be specified by simply stating n, the number of ones. That is what the notation is: a concise way to describe a (sub)network. For instance, 192.168.0.0/255.255.255.0 means the same as 192.168.0.0/24. Alex 
#3
 
 
Technical question of networks Alex Fraser wrote: "William4" wrote in message ...  well for me anyway. Given I understand basic 8 octlet network addressing and subnets; can someone clarify the notation w.x.y.z/a for me. I've determined 'a' as a subnet number (does /16 gives me the whole range w.x.y.??) but what is the basis; is it always 0 OR a or is it in segments? Written in binary, a subnet mask is n ones followed by 32n zeros. Therefore, a subnet mask can be specified by simply stating n, the number of ones. That is what the notation is: a concise way to describe a (sub)network. For instance, 192.168.0.0/255.255.255.0 means the same as 192.168.0.0/24. Yes. The common subnet masks are 24 bit  class c  255 available addresses 16 bit  class b  65 thousand odd addresses 8 bit  class a  16 million odd addresses per network  Alex Piece by piece the penguins have taken my sanity www.drzoidberg.co.uk www.ebayfaq.co.uk 
#4
 
 
Technical question of networks "Alex Fraser" wrote in message ... "William4" wrote in message ...  well for me anyway. Given I understand basic 8 octlet network addressing and subnets; can someone clarify the notation w.x.y.z/a for me. I've determined 'a' as a subnet number (does /16 gives me the whole range w.x.y.??) but what is the basis; is it always 0 OR a or is it in segments? Written in binary, a subnet mask is n ones followed by 32n zeros. Therefore, a subnet mask can be specified by simply stating n, the number of ones. That is what the notation is: a concise way to describe a (sub)network. For instance, 192.168.0.0/255.255.255.0 means the same as 192.168.0.0/24. Alex Thanks, I think I was working this backwards (from the lsb). So anything/0 is the whole caboodle and anything/31 is just two address then?  will they always be .0 & .1 or can you have w.x.y.120/31 for .121 & .121 ? 
#5
 
 
Technical question of networks "William4" wrote in message ... "Alex Fraser" wrote in message ... [snip] That is what the notation is: a concise way to describe a (sub)network. For instance, 192.168.0.0/255.255.255.0 means the same as 192.168.0.0/24. Thanks, I think I was working this backwards (from the lsb). So anything/0 is the whole caboodle and anything/31 is just two address then?  will they always be .0 & .1 or can you have w.x.y.120/31 for .121 & .121 ? A /30 is the smallest useful subnet you can have, but yes, you could have w.x.y.120/30 for w.x.y.120123. However, the address ANDed with the complement of the subnet mask must be zero. So, for example, w.x.y.121/30 is not valid (use a monospaced font): mask = /30 (255.255.255.252) = 11111111 11111111 11111111 11111100 ~mask = 00000000 00000000 00000000 00000011 address = w.x.y.121 = wwwwwwww xxxxxxxx yyyyyyyy 01111001 address & ~mask = 00000000 00000000 00000000 00000001 This is equivalent to saying that for /30, the last octet of the address must be a multiple of four. For /29, it must be a multiple of eight, and so on. For /24 down to /17, similar applies to the third octet and the last octet must be zero, eg for /22, the third octet must be a multiple of four. You can probably guess the rest . Alex 
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