no issue with a 1000mbs LAN's we run cisco/linksys version here and work perfect, as it does with the wifi on a Linux and wintel networks.
You are using mplayer for your streaming as well right, not just vlc? from shell in OS X
mplayer -ac mad "$(wget -q -O - http://root:dreambox@192.168.1.100/video.m3u)"
Change the IP to your dm boxes IP
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