[EMAIL PROTECTED] wrote:

I wanted to access IP packet and then subsequently UDP/TCP/ICMP/IGMP packet information. Are there any explicit function which I can call to get information like version, IHL, source port, destination port, etc. to get that information for each IP type of packet.

Not in libpcap.

See the tcpdump.org libpcap tutorial at

        http://www.tcpdump.org/pcap.htm

for some information on how to write your own code to find the IP header in a packet (the example is for Ethernet) and extract fields from it, and how to find the TCP (or other transport layer) header.
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