If I have a packet sending out from a LAN, can I find out which computer in the LAN sending out this packet?
Does this out going packet contains source information such as MAC address?
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If I have a packet sending out from a LAN, can I find out which computer in the LAN sending out this packet?
Does this out going packet contains source information such as MAC address?
http://www.ietf.org/rfc/rfc2464.txt
Read section 3, “Frame Format”. Each frame has a source Ethernet address, aka MAC address. All you need to do is read the memory at that offset. This is for IPv6, check out IPv4 here: http://www.ietf.org/rfc/rfc791.txt (see section 3, “Specification”)