N. Benes: > Example to generate a PCAP with 0x0000 IPv4 header checksum and > (correct) UDP payload with 0 checksum: > > text2pcap -n -e 0800 ipcks.txt ipcks.pcapng >> 0000 45 00 00 20 12 34 00 00 10 11 00 00 0a 00 00 01 >> 0010 0a 00 00 02 01 00 00 16 00 0c 00 00 00 00 00 00
As an improvement to the above example, here's a valid IPv4/UDP packet with IPv4 header checksum resulting in 0x0000 (IPv4 identification chosen accordingly): > 0000 45 00 00 20 96 cb 00 00 10 11 00 00 0a 00 00 01 > 0010 0a 00 00 02 01 00 00 16 00 0c 00 00 00 00 00 00 This packet is shown as fully correct in Wireshark, but DPDK's rte_ipv4_cksum() would set the checksum to 0xffff.
