Cool! I did something similar when I wanted to learn Go, but did my own parsers instead of using gopacket, I would recommend doing that yourself if you want to

Cool! I did something similar when I wanted to learn Go, but did my own parsers instead of using gopacket, I would recommend doing that yourself if you want to learn more low level stuff. How I parsed IP for example: type Addr [4]uint8 func (ip Addr) String() string { return fmt.Sprintf("%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]) } type Hdr struct { Version uint8 IHL uint8 DSCP uint8 ECN uint8 Length uint16 Id uint16 Flags uint8 Fragoffset uint16 TTL uint8 Protocol uint8 Checksum uint16 Src Addr Dst Addr } func (hdr *Hdr) Parse(d []byte) error { hdr.Version = uint8(d[0] >> 4) hdr.IHL = uint8(d[0] & 0x0f) hdr.DSCP = uint8(d[1] >> 6) hdr.ECN = uint8(d[1] & 0x03) hdr.Length = uint16(binary.BigEndian.Uint16(d[2:4])) hdr.Id = uint16(binary.BigEndian.Uint16(d[4:6])) hdr.Flags = uint8(d[6] >> 5) hdr.Fragoffset = uint16(binary.BigEndian.Uint16(d[6:8])) & 0x1fff hdr.TTL = d[8] hdr.Protocol = d[9] hdr.Checksum = uint16(binary.BigEndian.Uint16(d[10:12])) hdr.Src = Addr{d[12], d[13], d[14], d[15]} hdr.Dst = Addr{d[16], d[17], d[18], d[19]} if hdr.IHL > 5 { fmt.Println("extra options detected") // TODO: support for extra options } return nil }