Hi All,

We have the below scenario. Devices are IPsec tunnel mode configured.   Ref 
device  sends fragmented ping requests. Our device responds with unfragmented 
ping response. Router send packet too big with proposed MTU as 1280 and payload
as ESP packet number 3.  As soon as our device receives the Packet Too Big 
ICMPv6 packet, device becomes unresponsive for the next ping request from ref 
device. However our device is responding for ISAKMP informational messages from 
the 
ref device. Has anyone experience such issues.  Our device configuration are  
Linux 4.9.180 #1 SMP PREEMPT Fri Oct 23 23:29:20 America 2020 aarch64 
GNU/Linux. Any inputs are appreciated.

Our device              Router          Ref device                      PKt Num
<------------------------------ |----------------       Fragmented Ping Request 
1  (ESP)
<------------------------------ |----------------       Fragmented Ping Request 
2  (ESP)
--------------------------------        |--------------->       Unfragmented 
ping response      3  (ESP
<------------------------------ |                                               
4  (non ESP)
  (Packet too big)
<------------------------------ |----------------       Fragmented Ping Request 
5  (ESP)
<------------------------------ |----------------       Fragmented Ping Request 
6  (ESP)


Regards,
Jayalakshmi

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