farid mahini wrote:
Question: Since the SYN message has both source and destination
addresses (IP and MAC), why does MyServer request it? Wouldn't it get
added to ARP table as the SYN message travels up the stack to TCP layer.
You can configure lwIP to behave like that, but it's not a good idea to
do so as it
a) is a security issue and
b) can have a large performance impact as every incoming packet leads to
scanning the ARP table for a hit to update.
You should enable ARP_QUEUEING instead (define it to 1 in lwipopts.h) so
that the outgoing SYN is buffered by lwIP until the ARP response is
received. 1.4.0rc2 does this automatically.
Simon
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