Tag Archives: networking

Subnetting and Wildcard masks….love them or hate them

burleyman1 sent this link out to LinkedIn’s Cisco Certifications group:

Subnetting, love it or hate it if you are in the networking field it needs to become your friend. I have gone over a bunch of “easy” ways to learn subnetting and wildcard masks and to be honest some of them confused the heck out of me. So what I have written down is something I put together that helped me get it and to be able to do subnetting quicker and in a lot of cases in my head. So here it is, please let me know if this was helpful or confusing.

In subnetting the only thing you really need to memorize is…..

And then he goes through a simple way of finding the Magic Number (256 – subnet mask), and then subtract 2 to find the number of possible hosts on that mask.

via Subnetting and Wildcard masks….love them or hate them | burleyman1.

There is no Plan B: why the IPv4-to-IPv6 transition will be ugly

Iljitsch van Beijnum has written an excellent article on the upcoming doom that will be the IPv4 to v6 transition.

Legacy problems will be huge – there are home users running every ancient OS ever available out there.

There is no plan B. Despite the long list of the issues with IPv6 and its deployment, there are no alternatives. It took us the better part of two decades to get this far with IPv6, and there’s no way we can come up with, implement, and deploy an alternative before the lack of IPv4 addresses becomes a serious problem.

via There is no Plan B: why the IPv4-to-IPv6 transition will be ugly.