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N6→UE downlink fails after a long period #1500

Description

@ggsnpdsn

Description

With NAT disabled (which seems to have no impact either), the following occurs: after the UE attaches and comes online, I continuously ping the UE from the N6 interface. Initially, everything works fine. However, if I keep all device states unchanged and run a long-duration test, the ping fails after a random period of time.
At this point, I tried pinging a PC behind the N6 interface from the UE, and surprisingly, the reverse ping from the PC to the UE also automatically became successful again.

Environment

OS: Ubuntu 24.04
fix_stcp

Reproduction Steps

"Ensure that the PC on N6 can successfully ping the UE, and then maintain this stable connection for approximately 10 hours.

Expected Behavior

"Transmit ping packets stably and maintain an uninterrupted connection.

Relevant log output

Support bundle filename or link

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