ICMP: Echo Reply Without Request
This protocol anomaly triggers when it detects an ICMP echo reply without a matching echo request. This can indicate data tunneling over ICMP. Note: Seeing this alert can indicate that the IDP is installed incorrectly, or that packets are being dropped or re-ordered somewhere.
References
srx-branch-12.3
srx-19.3
srx-branch-19.3
vsrx3bsd-19.2
srx-branch-19.4
vsrx-19.4
mx-12.3
mx-19.4
vmx-19.4
mx-19.3
vsrx3bsd-19.4
srx-19.4
vsrx-12.3
vmx-19.3
vsrx-19.2
srx-12.3