high tcp segments resent

StephenB wrote:

Segments get retransmitted because packets get lost. Queue overflow is one possibility, but there are others. Note that the queues in the router are normally empty unless the router is downspeeding the connection. Some causes of packet loss: (a) bad cables. This includes cat-5 for gigabit ethernet (instead of cat 5e) (b) failing switch ports (could be in the NAS, the far end device, or any intermediate router/switch (c) WiFi interference (if the far end device is connected over WiFi (d) gigabit->100 mbit ethernet downspeeding in the absence of ethernet flow control. The TCP settings could potentially be adjusted in the far end PC, though I am not understanding why you think changing those settings would help. I think the cause is more likely physical layer, and that the solution probably lies there as well. Can you tell us more about your home network setup?

Thank you for offering your knowledge :)

From my nas I have a 1m cat 5e cable going to a belkin N750 DB router, from that I have a 20m cat 5e cable going to a D-Link DGS-1005D gigabit switch, then a 1m cat 5e cable to my tizzbird F20 android media player.
I'll try moving everything except my dsl modem to where the media player is, and then just go with a 1m cat 5e directly between the nas, router and media player to sort things out.

Thank you for mentioning the cables ;)
To be continued...