[Winpcap-users] question regarding retrieving ip_len

[Ramiro Polla]

Hello,
  ip_len = (ih->ver_ihl & 0xf) * 4;
Look here http://www.freesoft.org/CIE/Course/Section3/7.htm

The (& 0xf) is there to only get the four bits of ih->ver_ihl, and (* 4) is there so that we get the header length in bytes, not in 32bit words.

Bye,
Ramiro Polla
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