This sounds like a classic case of the TCP Receive Window (RWIN) being too small and limiting your throughput. TCP throughput is theoretically bounded by the "bandwidth-delay product", which implies that the RWIN of the receiving host has to be at least a large as the bandwidth of the slowest link between the endpoints times the round trip time between the endpoints if you want to use all the available bandwidth with a single TCP connection. If the RWIN is too small you'll get correspondingly slower throughput. The fix is to increase the RWIN on the end systems. The easiest way to do this in Windows is to download a free utility such as "DrTCP" or "TCP Optimizer", but Microsoft has instructions on their support site on how to do it by editing the Registry as well.
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...