Help with timestamp

["Marcos Paredes Farrera" <mpared () essex ac uk>]

Hi everybody

This is my first post in the List, I'm using tcpdump to monitor packets,
however I would like to know exactly how tcpdump is doing the time stamp
I would like to know if tcpdump assign the time stamp when the first bit in
the packet is just to be delivered or when the packet has already delivered
the last bit. And in other case if a packet is received how is time stamped
when the first bit enters or when the last bit is received.  Maybe this
question is silly but I really don't know how tcpdump makes the time stamp.

For example:

 ________            ________
|        |          |        |
|Packet 1|          |Packet 2|
|________|          |________|
|                   |
|                   |
|                   |
+Timestamp 1        +Timestamp 2


 ________            ________
|        |          |        |
|Packet 1|          |Packet 2|
|________|          |________|
         |                   |
         |                   |
         |                   |
         +Timestamp 1        +Timestamp 2

Regards Marcos

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