10.10.2.1 is my firewall
10.10.2.43 is my fileserver
10.10.2.45 is my computer


My firewall as "server"
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Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
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[  6] local 10.10.2.1 port 5001 connected with 10.10.2.43 port 46243
[  6]  0.0-10.0 sec    311 MBytes    261 Mbits/sec
[  6] local 10.10.2.1 port 5001 connected with 10.10.2.45 port 1243
[  6]  0.0-10.0 sec    271 MBytes    227 Mbits/sec

My windows computer as "server"

------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 8.00 KByte (default)
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[1884] local 10.10.2.45 port 5001 connected with 10.10.2.1 port 53611
[ ID] Interval       Transfer     Bandwidth
[1884]  0.0-10.0 sec   306 MBytes   257 Mbits/sec
[1872] local 10.10.2.45 port 5001 connected with 10.10.2.43 port 59564
[ ID] Interval       Transfer     Bandwidth
[1872]  0.0-10.0 sec   557 MBytes   467 Mbits/sec

My fileserver as "server"

------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[  4] local 10.10.2.43 port 5001 connected with 10.10.2.45 port 1250
[  4]  0.0-10.0 sec    525 MBytes    440 Mbits/sec
[  4] local 10.10.2.43 port 5001 connected with 10.10.2.1 port 53612
[  4]  0.0-10.0 sec    251 MBytes    210 Mbits/sec