IP Header version 5?

Question

I have following code in packet sniffer:

struct ip_header {
       unsigned char ip_ver:4;
...
};

...

printf("Version: %i\n", (int)ip_hdr->ip_ver)

The output of ths is "Version: 5". I think version can onl be 4 or 6, right?

Answer 1

I got it it is just the Header length first 4 bits and version is second 4bits, so it should be

struct ip_header {
       unsigned char ip_hl:4;
       unsigned char ip_ver:4;
...
};