We host a number of different servers. Windows 2003 server, linux etc. And we have a number of clients who connect into our systems using RDP, several through wireless networks that we provide. The wireless networks generally run well and we don't have many problems with them.
Several of these clients also have Linksys VOIP phones that connect into our asterisk server and provide phone services. Most of these run over the wireless links.
My question is, what tools would people recommend to monitor network performance and assist in improving general network reliability. Free ones that work on Linux & windows would be of benefit to us.
Also, I'm after network design strategies to improve performance/reliability as well.