Comments on: How to Subnet a Network http://learn-networking.com/network-design/how-to-subnet-a-network Where 127.0.0.1 is Home. Wed, 10 Mar 2010 16:28:43 +0000 http://wordpress.org/?v=2.9.2 hourly 1 By: Moulay http://learn-networking.com/network-design/how-to-subnet-a-network/comment-page-2#comment-12386 Moulay Thu, 04 Mar 2010 22:57:27 +0000 http://learn-networking.com/blog/network-design/how-to-subnet-a-network#comment-12386 hello all i'm new at this, i just have one question, the company i work for run out of ip addresses! the current addresses 192.168.107.XXX they were talking about getting more ips ? so my question is can you buy more ip addresses? and if you change to another Ip class, do you have buy anything as far as ip addresses or just bigger router or switches? hello all
i’m new at this, i just have one question, the company i work for run out of ip addresses! the current addresses 192.168.107.XXX
they were talking about getting more ips ? so my question is can you buy more ip addresses? and if you change to another Ip class, do you have buy anything as far as ip addresses or just bigger router or switches?

]]> By: Blackslaine http://learn-networking.com/network-design/how-to-subnet-a-network/comment-page-2#comment-11284 Blackslaine Thu, 31 Dec 2009 14:36:23 +0000 http://learn-networking.com/blog/network-design/how-to-subnet-a-network#comment-11284 Brilliant, just brilliant, it is so simple when you know how. Thanks a million and best of luck to you... Brilliant, just brilliant, it is so simple when you know how. Thanks a million and best of luck to you…

]]> By: Felix http://learn-networking.com/network-design/how-to-subnet-a-network/comment-page-2#comment-11023 Felix Fri, 18 Dec 2009 01:59:38 +0000 http://learn-networking.com/blog/network-design/how-to-subnet-a-network#comment-11023 The explanation on this subject is very good,but need to elaborate on the power of "N" just a bit morer.Thanks The explanation on this subject is very good,but need to elaborate on the power of “N” just a bit morer.Thanks

]]> By: Richard http://learn-networking.com/network-design/how-to-subnet-a-network/comment-page-2#comment-10601 Richard Wed, 25 Nov 2009 15:00:17 +0000 http://learn-networking.com/blog/network-design/how-to-subnet-a-network#comment-10601 It's indeed the most clearly laid out guide to subnetting..but would second Eddy and Gary's points that talking about N to the power of is unnecessarily confusing, because we are only ever raising the digit * 2 * to power of this or that. If you could update this to take into account IP Subnet Zero, change N to 2 and include some class A & B examples - would be perfect. It’s indeed the most clearly laid out guide to subnetting..but would second Eddy and Gary’s points that talking about N to the power of is unnecessarily confusing, because we are only ever raising the digit * 2 * to power of this or that. If you could update this to take into account IP Subnet Zero, change N to 2 and include some class A & B examples – would be perfect.

]]> By: Richard http://learn-networking.com/network-design/how-to-subnet-a-network/comment-page-2#comment-10597 Richard Wed, 25 Nov 2009 06:06:00 +0000 http://learn-networking.com/blog/network-design/how-to-subnet-a-network#comment-10597 IP Subnet-Zero It's this option, enabled by default on Cisco see http://www.itdojo.com/blog/2009/02/let-me-take-a-stab-at-this-ip-subnet-zero-thing/) that means that the formula specified in the article, "Usable Subnets = (2^n) – 2", should actually read "Usable Subnets = 2^n". Typos in my previous comment by the way: I said 'this doesn't apply when it comes to usable hosts', meant to refer to usable subnets. Same goes for the following 2 references to hosts, sorry for confusion. IP Subnet-Zero
It’s this option, enabled by default on Cisco see http://www.itdojo.com/blog/2009/02/let-me-take-a-stab-at-this-ip-subnet-zero-thing/) that means that the formula specified in the article, “Usable Subnets = (2^n) – 2″, should actually read “Usable Subnets = 2^n”.
Typos in my previous comment by the way: I said ‘this doesn’t apply when it comes to usable hosts’, meant to refer to usable subnets. Same goes for the following 2 references to hosts, sorry for confusion.

]]> By: Richard http://learn-networking.com/network-design/how-to-subnet-a-network/comment-page-1#comment-10591 Richard Tue, 24 Nov 2009 17:22:23 +0000 http://learn-networking.com/blog/network-design/how-to-subnet-a-network#comment-10591 there seems something obviously wrong here, or am I missing the blindingly obvious...the requirement is for 5 separate networks. The calculation is given as "Usable Subnets = (2^n) – 2 , where N = power of bits assigned". The need to minus 2 is understandable when it comes to the usable hosts calculation ("Usable Hosts = (2^n) – 2 , where N = power of bits remaining") because each host needs its own subnet address and broadcast address. But this doesn't apply when it comes to usable hosts. 2^3 means 8 usable hosts and that's what you get in this. The range of the final octet for each of the 8 usable hosts, including subnet address and broadcast address, is 0-31, 32-63, 64-95, 96-127, 128-159, 160-191, 192-223, 224-255. So if the school only implements 5 subnets, they have 3 in hand for future needs, not one. there seems something obviously wrong here, or am I missing the blindingly obvious…the requirement is for 5 separate networks. The calculation is given as “Usable Subnets = (2^n) – 2 , where N = power of bits assigned”. The need to minus 2 is understandable when it comes to the usable hosts calculation (“Usable Hosts = (2^n) – 2 , where N = power of bits remaining”) because each host needs its own subnet address and broadcast address. But this doesn’t apply when it comes to usable hosts. 2^3 means 8 usable hosts and that’s what you get in this. The range of the final octet for each of the 8 usable hosts, including subnet address and broadcast address, is 0-31, 32-63, 64-95, 96-127, 128-159, 160-191, 192-223, 224-255. So if the school only implements 5 subnets, they have 3 in hand for future needs, not one.

]]> By: DAMBIO ISAAC CLIVE http://learn-networking.com/network-design/how-to-subnet-a-network/comment-page-1#comment-10584 DAMBIO ISAAC CLIVE Tue, 24 Nov 2009 15:09:28 +0000 http://learn-networking.com/blog/network-design/how-to-subnet-a-network#comment-10584 Yeh ithink i can give a clear reason please just give me a sec Yeh ithink i can give a clear reason please just give me a sec

]]> By: DAMBIO ISAAC CLIVE http://learn-networking.com/network-design/how-to-subnet-a-network/comment-page-1#comment-10583 DAMBIO ISAAC CLIVE Tue, 24 Nov 2009 15:07:52 +0000 http://learn-networking.com/blog/network-design/how-to-subnet-a-network#comment-10583 Ive been a memeber of cisco systems for a good period of time and i feel delighted to see the above information still being provided to us world wide. Ive been a memeber of cisco systems for a good period of time and i feel delighted to see the above information still being provided to us world wide.

]]> By: gaurav http://learn-networking.com/network-design/how-to-subnet-a-network/comment-page-1#comment-10432 gaurav Tue, 10 Nov 2009 21:35:29 +0000 http://learn-networking.com/blog/network-design/how-to-subnet-a-network#comment-10432 can you please put some light on the reasons of reducing two from 2^n while calculating usable subnets and hosts. Thank you can you please put some light on the reasons of reducing two from 2^n while calculating usable subnets and hosts.

Thank you

]]> By: Naren http://learn-networking.com/network-design/how-to-subnet-a-network/comment-page-1#comment-10044 Naren Sun, 11 Oct 2009 14:53:07 +0000 http://learn-networking.com/blog/network-design/how-to-subnet-a-network#comment-10044 hey thanks, but can you please explain some more in the class b, i would really appreciate if you could update on class b with examples too, thanks a lot. hey thanks, but can you please explain some more in the class b, i would really appreciate if you could update on class b with examples too, thanks a lot.

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