Which interface for monitoring?

Which interface for monitoring?

hi all,
I've Cisco router 18xx and there are 3 interfaces:
- FastEthernet 0 - outside - internet connection to ISP with public IP address
- Tunnel0 - site to site tunneling between our branches
- Vlan1 - inside - LAN connection

I need monnitoring for:
- internet connection
- site-to-site connection

In which interfece I have to run ip route-cache flow?
Am I able to see packets running between site-to-site tunnel?

Thx
Milan













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