HOWTO extract the IP src/dst address from a packet

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A common question we hear is, "what is the appropriate way to extract the ip src/dst address from a packet"? Here is the official answer ...

HOWTO extract the IP src/dst address from a packet

What is the appropriate way to extract the ip src/dst address from a packet?

 // copy packet to avoid modifying the original packet
 Ptr<Packet> copy = p->Copy ();
 Ipv4Header iph;
 copy->RemoveHeader (iph);
 // copy will disappear when you are done with it.

Craigdo 19:55, 5 August 2008 (EDT)