From: fintch@fintch.org   
      
   Hi   
      
   I encounter same kind of problem with 6.12.69+deb13 in Trixie.   
      
   My working configuration with 6.12.63 is broken after upgrade to 6.12.69.   
      
   Unlike your bug on bookworm, in my configuration packets are sent but   
   silently dropped on remote side.   
      
   I found something on kernel 6.12.67: some changes was made on ip6_tunnel   
   and other modules. Here is a commit example for 6.12.67:   
   df5ffde9669314500809bc498ae73d6d3d9519ac, there is also other commits on   
   macvlan and ip_gre   
      
   I cannot be sure those changes introduce the bug, I am not a developer.   
   I found also https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1127597   
      
   You should have a look on 6.1.x for same kind of bug fixes.   
      
   Hope it helps!   
      
   F!nTcH   
      
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