[lwip-users] Re: [lwip] PBUF_TRANSPORT_HLEN

[Adam Dunkels]

Hi Leon!

On Friday 01 March 2002 14.50, you wrote:
> on the subject of pbufs, why is PBUF_TRANSPORT_HLEN
> the same as PBUF_IP_HLEN?

This is just because the IP header is just as large as the TCP header - 20 
bytes. 

> I suspect the transport (UDP, TCP) header must be included in
> the header size as well?

It is, because of the fallthroughs in the switch() statement in pbuf.c. The 
offset variable is incremented through the switch, until it is correct (20 + 
20 + PBUF_LINK_HLEN).

/adam
-- 
Adam Dunkels <address@hidden>
http://www.sics.se/~adam
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