Hum i am syncing a few thousand files to a linux server and i don't really get bandwidth like that Ex at idle. And most of it is from another process doing some stat reporting to another server. usr sys idl wai hiq siq| read writ| recv send| in out | int csw 0 0 100 0 0 0| 0 0 | 132B 1308B| 0 0 | 66 142 0 0 100 0 0 0| 0 0 | 396B 2228B| 0 0 | 59 121 1 0 99 0 0 0| 0 0 | 370B 2431B| 0 0 | 62 114 0 0 100 0 0 0| 0 0 |2656B 2260B| 0 0 | 73 132 0 0 100 0 0 0| 0 0 | 132B 1308B| 0 0 | 62 118 0 0 98 1 0 0| 0 56k| 132B 1308B| 0 0 | 117 234 0 0 99 0 0 0| 0 0 | 259B 1308B| 0 0 | 57 112 0 0 100 0 0 0| 0 0 |1880B 1308B| 0 0 | 64 132 0 0 100 0 0 0| 0 0 |1132B 1308B| 0 0 | 62 118 You can use http://www.wireshark.org/ to see whats really going my guess if you have something else doing that. You could also put a limit with iptables or other firewall. On brodcast packets (btsync tries to find peers on the local network by broadcasting) Also what size is your subnet, you could have issues with large ones with other people also using sync. Or someone eles broadcasting on the subnet, it happens often if switches don't have limits set.)