Subnetting occurences in the real world

techfiend

I recently started studying CCENT again and forgot how much I loved subnetting. It's the thing that interests me so much in networking. However I can't imagine it's used all that often in the real world. For those that work with networks every day is subnetting something you use regularly? Is it mainly network engineering or network architect responsibility?

d4nz1g

I use it almost everyday. Activating a new site (advertising on our routing protocol), firewall statements, ACL, QoS, etc.

Even if you are not responsible for the definition of new addressing space, you have to deal with it often in the operation side.

markulous

I work for a MSP so I mainly do a lot of systems and desktop stuff, but it's usually all /24 it seems like.

xnx

If you work with routing etc a lot then maybe, else most places just use a /24 for each vlan..

kohr-ah

Corporate life for me.

I use it all the time as well. A lot for firewall rules more than anything or summarize things on the nexus.

ccie14023

Uh, yes I do use it every day and probably have every day for the last 15 years. I don't think you could have an enterprise network that isn't subnetted...

Kai123

Working in a NOC, /30 is popular, customer having the even number.

techfiend

I can see it in firewalls but are those mainly (extended) ACL's? In what tasks do you subnet as a network engineer for an enterprise? I can see when adding clients but I wouldn't think that would be an every day thing. Troubleshooting?

At our little place we use /24 for lan, /30 for a few wan links.

IIIMaster

Yeah pretty much, I use it too. Sometimes I have to validate customer ip addressing scheme.

networker050184

You'll be working with network masks a lot, but you get used to it after a while and it's second nature. Not like the days you have to break out a pencil and paper and draw ones and zeros in the begging anyway. If I do anything even remotely complicated I use a calculator anyway to ensure 100% accuracy.

Xavor

My network lead subnets and supernets all the networks. It keeps things interesting for sure.