Hi pippo and welcome.
Unfortunately I dont know the answer to your question. Asbokid may well have been able to help, but he's away atm and we're not sure when he will be back.
Hello Kitz!
At the moment I am fine using the IPQoS=sc0 option in linux even it is just a workaround.
I have done some further investigations...
I tried to change some QoS setting in the router with the CLI interface, but so far I didn't succeed to solve the problem.
I am starting to think that the problem is caused by some bug in the firmware, which somehow does not recognize the QoS for DSCP IP packets, and it cannot be simply solved by tuning the configuration.
Indeed the linux scp/ssh commands use by default the DSCP classes "lowdelay" and “throughput”: it looks like the router is giving a very low priority to those DSCP classes, causing transfer timeouts.
Can somebody expert of windows tell me how the IP packets are classified in terms of QoS by programs like winscp ?
Thanks again for any help!