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The first question would be if the central has multicast support enabled in it's kernel and if not has anybody figured out how to get a replacement kernel on it?

Looks like the Central defconfig doesn't have multicast. Getting new kernels on is easy: you just replace /zimage (or /vmlinux, or some such file). You should of course start from the Central kernel sources, not stock 2.4, not least because IIRC we had to patch ReiserFS to get it to work on ARM. (Yeah yeah, but ext3 hadn't been invented in those days.)

Peter