[lwip-users] Re: [lwip] why PBUB_LINK_HLEN = 16

[Kieran Mansley]

On Wed, 13 Mar 2002, Mumtaz Ahmad wrote:

> Hi guys
>
> Well in code   PBUB_LINK_HLEN is defined as 16 but inreality the the eth_hdr
> is of 14 size .Is it for some reasons ?

Judging by your more recent message I think you've discovered the reason
for this!  It's because the first two bytes aren't used (so extending the
size by 2 bytes) in order to ensure the ip header is word aligned.  I
suspect this is the case anyway, I've not had anything to do with the
ethernet parts of the code.

Kieran

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