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CoA request and ACK

Hi,

Do you now if CoA ACK message must use the same source IP address than the CoA request destination IP address ?

In my case ISE send a CoA request to the IP address 192.168.1.100 and the switch answers (CoA ACK) with another source IP address.  

In the logs I have this message :

11213 No response received from Network Access Device after sending a Dynamic Authorization request

I am working with Third Party Devices....

Thank you