Question: where is the source address located in an ipv4 header
Answer: IPv4 Header Format Offsets Octet 0 Octet Bit 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 0 0 Version IHL DSCP ECN Total Length 32 Identification Flags Fragment Offset 8 64 Time To Live Protocol Header Checksum 12 96 Source IP Address 16 128 Destination IP Address 20 160 Options ( if IHL > 5 ) 24 192 28 224 32 256