Plus the information Anand has provided, i'd like to add, each router supports different kinds of interface, example Cisco 7200VXR supports only PAs, while the 2600 series supports both WICs and NMs but not PAs.
This document gives several answers on frequently asked questions for PFRv3 channel state behavior.
Q1: What are all the channel operational states from a BR (border role) perspective and what are the rules/conditions to be in each st...
The need was to reach an host inside a LAN through a VPN connection managed by the LAN gateway (Cisco 1921).
The LAN gateway performs NAT and there was a dedicate nat rule for the host i wanted to reach through VPN.
I couldn't connect to the hos...