This is sort of a vague question, but its really been bugging me for a long time. I cannot seem to get a connection between two computers to go above 300 kbit/s in my LAN. This seems to be a magical limit, since it has been present with two different switches, one windows box, one ubuntu box, one debian NAS and others. I'm starting to suspect that the settings of ISP routers is to prioritize internet traffic and cap the LAN. I've tried to cable computers together without the switches (for instance ubuntu<->debian NAS 30 MB/s, windows<->ubuntu similar), so that's not the problem. I also get the same cap for both wired and wireless communication, so encryption does not seem to be the bottleneck. Futhermore, the internet connection is excellent (10 Mbit/s without a problem), so the routers can apparently handle the load. There is also no defect cable or mysterious connected device, since I've tried every possible and simple configuration but still cannot get past the mysterious limit.
The routers I've tried are a Davolink DV-2020 and a Netgear WGT 624.
My question is if anyone else has seen this type of behaviour and can give some advice. Thanks in advance.
UPDATE: The NAS says full duplex:
eth0: link up<5>, full duplex<5>, speed 100 Mbps<5> eth0 Link encap:Ethernet HWaddr 00:16:XX:XX:XX:XX inet addr:192.168.1.12 Bcast:192.168.1.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:258 errors:0 dropped:0 overruns:0 frame:0 TX packets:380 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:512 RX bytes:23632 (23.0 KiB) TX bytes:51782 (50.5 KiB) Interrupt:21