REPLY: 2:280/5555 642ecc2c   
   MSGID: 2:5005/49 642f0211   
   CHRS: CP866 2   
   TZUTC: 0700   
   TID: hpt/fbsd 1.9.0-cur 2019-12-05   
   Dear Michiel,   
      
   06 Apr 23 15:38, you wrote to me:   
      
    VS>> Does anyone know what software clients actually support IPv6   
    VS>> Pin-holing?   
      
    MV> I am not sure what you mean by "software clients" in this context.   
    MV> IPv6 pin-holing is something that is applied to a firewall. Firewalls   
    MV> are found in routers and OSs.   
      
   A "software client" in this context is a software like Transmission or   
   uTorrent for example, which is capable of requesting a router to open a port   
   to allow incoming packets to the address/ports where the software is listening.   
      
   In other words, a "software client" is something that "applies" pin-holing to   
   a firewall.   
      
    VS>> I would think Bittorrent clients and utilities like syncthing   
    VS>> should (because they support UPnP for IPv4), but I guess they   
    VS>> don't do IPv6 Pin-holing. Maybe some games?   
      
    MV> Please eleborate...   
      
   The Transmission torrent client, and the syncthing file synchronization   
   utility can use the UPnP protocol to request a firewall to pass *IPv4*   
   incoming traffic (and create a port porwarding for IPv4 NAT). They cannot   
   however (at least to my knowledge) use UPnP or any other protocol to request a   
   router to open a hole for incoming traffic in an *IPv6* firewall.   
      
   Victor Sudakov, VAS4-RIPE, VAS47-RIPN   
   --- GoldED+/BSD 1.1.5-b20170303-b20170303   
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