I have 2 routers, R1 (had end) and R2 (remote) connected via the public cloud.
The config is as soecified in the document attached.
The link latency is about 1500ms. HOwever, I have the following issue.
My issue is R1 and R2 failed to ping each.
When R2 senr traffic via tunnel can be seen by my firewall at the headend site. However, the return traffic back to R2 also been seen by my firewall.
I enable the ip accouting on the tunnel interface on R1 router, it shown that the traffic is being put into the tunnel.
HOwever, I also enable ip accounting on the R2 router, but, I did not see any output traffic.
It seems to me that the traffic sent to the tunnel went missing in the cloud.
From, the firewall, I noticead that the return traffic sent by the R1 router is GRE traffic instead of ESP...
Can I know why? I can't ping the tunnel ip and also the ipsec peer IP.
Can I know why?