IP Level:

1. IP_PUSHPENDINGFRAMES
   Pushed pending frames from a protocol have been received from a specified socket into the specified socket buffer.

2. IP_FLUSHPENDINGFRAMES
   There has been a ``cork'' in the specified socket buffer and therefore all of the pending frames are being flushed immediately and won't be sent.

3. IP_SENDPACKET
   The specified IP socket buffer has sent a packet. Whether it's a fragment or not, its fragment offset, packet size, total size, the requesting PID and the current MTU are all logged.

4. IP_RECEIVEPACKET
   The specified IP socket buffer has received a packet (unprocessed). Whether it's a fragment or not, its fragment offset, packet size, total size, the requesting PID and the current MTU are all logged. NOTE: The total size of the de-fragmented data is not applicable until the last fragment arrives.