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I've got an IPSec S2S tunnel setup. The VPN is connected, tunnel established.

Here's the network topology:

enter image description here

(for reference, I am Peer A)

Problem:

  • host A pings host B and gets reply (this is not a problem, just giving context)
  • The problem:host B pings host A and does not get reply (and cannot access resources on host A)

When host B pings host A, I can see the ICMP packets passing through the ER-X at peer A, arriving on host A, and replies being sent from host A to host B, but host B never receives the replies. The admin at Peer B says the replies not arriving on their side of the tunnel.

What am I missing?

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Answer: the problem was SPI firewall on the peer A gateway

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