Configure a Linux router for fair bandwidth allocation without unnecessary limiting it

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http://serverfault.com – I run a Linux router (more precisely OpenWRT) on an internet connection with very limited bandwidth, around 1 MBit/s downstream and some dozen kBit/s upstream. There are several machines on the net that do low-bandwidth stuff, like playing web radio or sending measurement data. Other machines may start normal downloads for software updates occasionally. Whenever a machine starts a download, the low-bandwidth stuff gets choppy. I suppose that the bandwidth of the stream gets reduced because there's another connection on the router, although it woudl "fit" nicely into the WAN b/w. This is a bi (HowTos)