The backside of this, IIRC, is that udhcpc will eat up huge chunks of
CPU parsing "uninteresting" packets, on "heavy" loaded networks.
Bug #6746 names "FRITZ!Box 7570 router (mipsel)" and some unnamed
kernel version that "Apparently my kernel does not support this filter
feature".
Maybe a better alternative would be to either enable the "filter
kernel feature" (witch will not only benefit busybox, but the whole
system) or to make the BPF filtering a configurable busybox feature.
That way noone would need to patch the udhcpc source.
See also the kernel source:
Documentation/networking/filter.txt
Cheers,
--
Cristian
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