Cisco VPN

Hi all,

I got a urgent question need to ask. I configure three cisco 831 router on VPN… as below

Site B ==== Site A ==== Site C

LAN for Site A: 192.168.0.1 – 254
LAN for Site B: 192.168.1.1 – 254
LAN for Site C: 192.168.2.1 – 254

i can see all the site is connected on
#sh isakmp sa.

But i can’t ping the other site LAN.