Setting the Buffer Size Without Restarting the NIC?

[Hei Chan <structurechart () yahoo com>]

Hi,

When I call pcap_set_buffer_size() on an actively using/running NIC, it gives me an error:
can't perform  operation on activated capture


Is there a way to change the pcap capture buffer size without deactivating it?

How does this buffer different from SO_RCVBUF?  It seems like SO_RCVBUF doesn't matter in this context anymore because 
libpcap goes through a different route in receiving packets?
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