wireshark - Libpcap ICMP Packet never responded to -


i'm playing around libpcap trying send ping whenever send requests never responded to, no errors given , looks identical regular ping sent through ping utility.

the left packet sent through ping on terminal , right through app. far can tell data field optional don't include it, , identifier/sequence numbers can random, randomised.

am missing obvious here?

enter image description here

i notice haven't validated ip header checksum. sure in fact correct? if isn't next router silently drop packet consistent you've seen. wireshark should able validate ip header checksum if switch on.


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