REPLY: 2:280/5555 6434155d   
   MSGID: 2:5005/49 6434c8a4   
   CHRS: CP866 2   
   TZUTC: 0700   
   TID: hpt/fbsd 1.9.0-cur 2019-12-05   
   Dear Michiel,   
      
   10 Apr 23 15:46, you wrote to me:   
      
    MV>>> Please eleborate...   
      
    VS>> The Transmission torrent client, and the syncthing file   
    VS>> synchronization utility can use the UPnP protocol to request a   
    VS>> firewall to pass *IPv4* incoming traffic (and create a port   
    VS>> porwarding for IPv4 NAT). They cannot however (at least to my   
    VS>> knowledge) use UPnP or any other protocol to request a router to   
    VS>> open a hole for incoming traffic in an *IPv6* firewall.   
      
    MV> I see. Or so I think. You ask for some kind of "IPv6 equivalent" for   
    MV> UPnP. But why would you want that? UpNP is a questionable idea anyway.   
    MV> For IPv4 it creates an entry in de NAT table and as a side effect   
    MV> creates a hole in the firewall.   
      
    MV> But why would you need that for IPv6?   
      
    MV> For IPv6 there (normally) is no NAT, so no need to create an entry in   
    MV> a NAT table.   
      
   The "IPv6 equivalent" for UPnP is not for creating entries in the NAT table   
   (which is absent in IPv6). It is for creating rules in an IPv6 firewall   
   allowing incoming traffic to an application running on an IPv6-enabled host. A   
   firewall (IPv4 or IPv6) is usually configured to block incoming traffic which   
   is not part of an established outgoing connection.   
      
    MV> In IPv6 avery device has a Unique Global Address, so one   
    MV> can simply create pinholes in advance as needed for the address in   
    MV> question.   
      
   Only when you know the IPv6 address and port beforehand. Usually an IPv6   
   address on the home LAN is dynamic (SLAAC), and the port in peer-to-peer   
   applications, VoIP applications etc is often dynamic too.   
      
   Victor Sudakov, VAS4-RIPE, VAS47-RIPN   
   --- GoldED+/BSD 1.1.5-b20170303-b20170303   
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