Re: Influence of pcap_open_live parameters on pcap_sendpacket

[Guy Harris <guy () alum mit edu>]

On Aug 16, 2011, at 5:10 AM, Doktor Bernd wrote:

> Two questions:
> - Do the two pcap_open_live() calls influence the hardware in anyway and have side effects on each other or are they 
> bound to the handle and I can rely on the parameters I give to be set?

For LAN hardware, the "promisc" argument to pcap_open_live() affects whether the interface is put in promiscuous mode; 
all handles will be in promiscuous mode if any are (or, for that matter, if any other process has turned on promiscuous 
mode directly rather than through libpcap).

> - Do the parameters influence pcap_sendpacket() in any way? From the documentation I assume that they are only for 
> capturing from that interface.

None of them should affect pcap_sendpacket() directly; perhaps running in promiscuous mode will, for example, cause the 
network adapter to be busier, which might slow down its sending of packets to some degree.-
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