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Subjectsockets in SOCK_PACKET mode?
Please forgive if this is off topic, it seemed to me the folks on this
list would know the most about this.

I recently started playing with sockets into the interface packet layer,
opened via a call something like this:

s=socket(AF_INET,SOCK_PACKET,0);

I learned about this type of socket through a small sniffer (linsniff.c).
linsniff calls socket() like this:

s=socket(AF_INET,SOCK_PACKET,htons(0x800));

My question is, what is this magic number 0x800 for? I can't find it as a
#define in any of the include files in the standard include tree. Is it
necessary? In response to the inevitable question, yes, I am writing my
own sniffer, simply because I want to play with packet-level sockets and I
couldn't think of a better thing to do with them.


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