udhcpc: don't use BPF filter, users report problems (bugs 4598, 6746), commit e4785ca653d0e219926692c229673b2c1b8d6ac4
cristian.ionescu-idbohrn at axis.com
Tue Feb 4 19:48:38 UTC 2014
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
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:
More information about the busybox