I am struggling to get Rspan configured to capture packet from ipphone over the WAN. the topology is below. Could someone help with the steps to get it done?
Wireshark (pc) --->SWITCH --> ROUTER -->WAN--> ROUTER --> SWITCH -->IPPHONE
Unfortunately you can't do RSPAN over WAN. Which kind of switch are you using?
From my point of view the only way is to use ERSPAN but it is not supported from all switch.
You can try to follow the guide below, it's describe how ERSPAN work and how to configure it.
After some research I found out that I can do Cisco IOS Embedded Packet Capture
since I have 4431 router. I will do some research about it and let you know.