I have heard the term source used a lot in networking. What exactly do people mean when they say things like:
please modify your config so you can source both ssh and tacacs to the loopback interface.
ping the device with a source address from network nn.n.n.n
My take is that the loopback interface should be assigned the ip address that will be used to ssh to the device and that the tacacs server should have an entry for the ip address assigned to the loopback interface. If so wouldn't have been easier to say please make sure you create a loopback interface and assign it the correct address?
I am not sure how you ping with an ip sourced from a particular network, I have tried on certain devices by just typing ping and then enter to get options but I have not seen a source network option?