Re: [lwip-users] Misalignment problems on PowerPC (little endian mode)

[address@hidden]

Muhamad Ikhwan Ismail wrote:
> Hi,
>
> Thanks Bill and Simon. Simon is right, my payload is aligned. The 
> problem arises when the Ethernet header
> gets stripped, the IP addr field is not aligned when it gets accessed. 
> And I didnt know structure packing is a must. Then I have to
> find a way to make my port works. Meaning even if i fixed my ip addr 
> processing macros and functions, Ill still get problems ?
I'm not sure but I think so, yeah. The reason is the same reason 
'network byte order' is used: when you exchange data over the network, 
everyone would have to use the same alignment. Instead, packing is used.
> I thought i woulnt since all e.g TCP header fields are 2 bytes aligned ?
At least DNS had a problem with non-packed mode, I think. DHCP could 
have problems, too...

Simon