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
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