RE: [lwip-users] It is weired!

[Chien-Lung Wu]

Hi, Jonathan:

    I got it. Thank you so much.

David
 

-----Original Message-----
From: address@hidden
[mailto:address@hidden On Behalf Of
Jonathan Larmour
Sent: Friday, December 14, 2007 12:48 PM
To: Mailing list for lwIP users
Subject: Re: [lwip-users] It is weired!

Chien-Lung Wu wrote:
> I defined DHCP protocol structure as following:
> 
> typedef struct dhcp_s {
>     u8_t            dhcp_op;
>     u8_t            dhcp_htype;
>     u8_t            dhcp_hlen;
>     u8_t            dhcp_hops;
>     u8_t            dhcp_xid[4];
>     u8_t            dhcp_secs[2];
>     u8_t            dhcp_flags[2];
>     u8_t            dhcp_ciaddr[4];
>     u8_t            dhcp_yiaddr[4];
>     u8_t            dhcp_siaddr[4];
>     u8_t            dhcp_giaddr[4];
>     u8_t            dhcp_hwaddr[6];
>     u8_t            dhcp_sname[64];
>     u8_t            dhcp_file[128];
>     u8_t            dhcp_option[312];
> } dhcp_t;
> 
> Everything seems fine except that dhcp_option[312] always shift 10
bytes
> ahead (overlapping with dhcp_file) when I use

Your chaddr field should be 16 bytes, not 6. See
http://tools.ietf.org/html/rfc2131#page-9

Jifl
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