Have a question that I need to ask. Its been a while since I have configured a large private network but this issue alerted me. I am administering a domain with and address structure of 10.52.2-3.0 255.255.254.0. When the DHCP scope was configured they spanned 10.52.2.141 through 10.52.3.100. My issue is with the 10.52.3.0 address which is being assigned to a device(PC). I know it will work, I am not arguing that fact. What I am arguing is the best practice scenario. Years ago when I was taught TCP/IP networking it was made pretty clear you never want to use an address with a 0 octet in the last position.
Which seemed to make sense since that was the way you would define a network. 10.0.0.0 network, 192.168.0.0 network etc.
That address is perfectly legal and pretty much always has been, in the context of CIDR and the mask used. The rule that you should follow, however, is to make sure that the host portion is not all-zeros. With an address of 10.52.3.0 and a mask of 255.255.254.0, the host portion of the address is 100000000, which is not all-zeros and is therefore okay.
Thanks for the reply, I know it is a valid address and usable but I thought it was a good practice not to use it. I guess it comes down who taught who.. I had a professor who back in school was dead set on drilling in to our heads that no matter what the scope of the range you always want to reserve out the addresses ending in 0..
I agree that a zero-octet can cause a bit of confusion. However, I think people should forget about classful boundaries now, where masks were set on an 8-bit boundary. With the almost universal use of CIDR, it does not really make sense not to use such an address. As you said, this was something taught to you a long time ago...but times have changed :-)
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.