Cisco Bug: CSCvu15689 - PD IOS-XE shouldn't reply to a validated packet from an unknown src using a dst IP from IKE/IPSec SA
May 28, 2020
- Cisco IOS
Known Affected Releases
Symptom: This is an enhancement to fix the PD part for the corresponding PI enhancement CSCvi70236. In current IOS/IOS-XE implementation if we receive a packet from an unknown IP address and it is valid in terms of integrity protection, the router will reply to such a packet and use as a destination the IP address from IKE or IPSec SA. Such a behavior may end up in a situation where an SA will never establish or it will introduce asymmetrical traffic flow. Conditions: The address of the received ESP/IKE traffic is different compared to the initial IKE/IPSec SA, for example due to NAT changing on the transit network.
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