Re: [lwip-users] IP packet dropped due to bad version number 15

[Kieran Mansley]

On Thu, 2009-10-22 at 14:35 +0700, Iwan Budi Kusnanto wrote:
> Hi, i try to port lwip. I run the OS in qemu, and set lwip IP to 192.168.0.1
> When i ping 192.168.0.1, i continuously get the following error, below.
> Note : the qemu & tap0 setting was fine. Previous lwip port can be
> ping-ed with this setting.
> I also copy-paste my 'tcpdump -i tap0'.
> Any idea ?
> 
> ** error from lwip **
> IP packet dropped due to bad version number 15
> IP header:
> +-------------------------------+
> |15 |15 |  0xff |     65535     | (v, hl, tos, len)
> +-------------------------------+
> |    65535      |000|      23   | (id, flags, offset)
> +-------------------------------+
> |  242  |  244  |    0xad11     | (ttl, proto, chksum)
> +-------------------------------+
> |    8  |    6  |    0  |    1  | (src)
> +-------------------------------+
> |    8  |    0  |    6  |    4  | (dest)
> +-------------------------------+

As you can see, lwIP has been passed an IP packet that is completely
corrupted.  The values in the header make me think that this is not an
IP packet at all.

Kieran