Discussion on:

Cisco IP subnetting 101: Five things you should know

what did you guys/gals think of this one?

David Davis

I'd like to invite everyone to visit my blog. I just started it. So far, there is only one entry but I will making daily posts. It is really cool that you can also receive it via an RSS feed!

Here is the link-
http://techrepublic.com.com/5247-6257-0.html

David, that link only takes me to a page where I could create my own blog. It doesn't point to yours.

Here is the correct link to my Blog-
http://techrepublic.com.com/5247-6257-0.html?id=994753

When I read the title for the article and also seeing that it was written by a CCIE I had expected a little more content. The article that was written was what should be known by IT professionals subnetting networks and not necessarily what needs to be revised.

I think I would have liked to have seen content showing how taking bits from the host to the network portion of the address changes the amount of subnets you have.

A basic discussion of route summarisation and a bit more about CIDR and the roles they play within sub-netting would have be more useful than telling us all what we already know.

Sorry. But please write more!!!

Thank you for taking the time to post and for being honest about what you would like to see. I will do my best come up with a more advanced IP subnetting article.

Thank you for reading TechRepublic (and especially my articles).

David

I too think this article came up 1 paragraph short. Explaining how 255 masks to 11111111 and "/" address are good basic info, but the point of the article was in how networks were being "broken up" inside of the original classes. A final paragraph with an example of a /27 address, say in the context of and ISP assignment would have crystalized the topic and demonstrated a clear justification of its use.

We appreciate the article, just trying to do a little part to improve the context. Thanks to all who submit articles imparting some of their expertise!

Dave AKA Da Cisco Man,

I thought your article was well writen
and was a good refresher for the avergae Joe,
that's on a mission to know the principals of Cisco Networking. Thank you for your explanation you are Da Ciso Man 4life.

May have been too simple but sometimes simple is the best way to get into to proper mind frame.

This article is good for System admins and even for some developers. It is suprising to me how many have no clue as how traffic moves from one system to the other.
A bit more information on "network" and "broadcast" addresses would be a valuable addition I believe.
For networkers in general a discussion of the differences between a mask and a wildcard would also be benificial.
I came up having to learn binary, octal, and hexidecimal numbering systems and math so sub-netting is a piece of cake. Folks should really learn the underlying principles...most of the rest comes easily then.

I like the way you explain things. I've been doing networking for years and you are right, subnetting is something you quickly forget if you don't use it constantly. I've taken many of Cisco's courses through the years and I think you gave a good basic explanation of subnetting better than any of them.

I am totally agreed to your comments to David!

David: Big Kudos to you, You' Da "Cisco" Man

Best Regards,
Arthur

Arthur,
Thanks for your complements!
I like my new title, "da cisco man", maybe I should put that on my business card (smile).
Thanks for reading TechRepublic and thanks for taking the time to post!
Have a great day,
David

How about an article on how to do IP-Less Routing on a cisco 7200, I do it on an M7I juniper.

Dave,

The article was a good review of the basics of IP subnetting. Even for us that have been doing TCPIP since before the days of DNS it is good to review those basics every once in awhile, especially with IPV6 staring us in the face. Boy will that be fun :))

Nice start, but somehow the whole thing got to an abrupt end. What i most missed was the Cisco perspective or catch. Subnets aren't really Cisco-exclusive... so this was more of a "TCP/IP Subnets 101, first lesson".

But i will stay tuned; jsut let me get another can opened (oh, that's tuna-ed)

~rL

Good Tips. Remember on the CCNA test, one will be required to subtract the 2 subnets that can't be used. Cisco doesn't tell that there are no numbers that can't be used until CCNP. Keep up the good work.

thank u about the good information

hmm what i think ,,,, i didn,t think anything
guys i done it all but still i m so confused about subnetting how its start when we need it and how to subnet from ip how could we how much subnetting can be done by one ip ... i need all this information can anyone tell me where to find basic for that all ?