Originally Posted By: wwillson
Originally Posted By: Miller88
For most people who just browse the Internet, pay some bills, social media, it's really perfect. But now there is a ton more compatible software for different version and even if you have other software requirements, it probably works or has an alternative.
Originally Posted By: pandus13
I wonder what OS are using the Cisco switches/routers/firewalls that most of our day-to-day internet traffic goes trough....
Cisco's own IOS or CatOS - not based on Linux or Unix, AFAIK
Almost every box from Cisco runs Linux, except the the IOS-XR which runs QNX, however now IOS-XR 5 and 6.1.1 run Linux.
I don't believe that's accurate. IOS features have been ported to Linux, but most of the gear not running IOS-XR is still running the old monolithic IOS images such as switches, ISR's and Access Points.
Now of course there is the Linux-based ASA OS, as well as the acquired FirePower software which also runs on Linux, and Cisco has had a ton of consumer and SMB products that were Linux-based.