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[lwip-devel] etharp oddity

From: Mountifield, Tony
Subject: [lwip-devel] etharp oddity
Date: Tue, 20 Jul 2004 15:32:33 +0100

I've just resumed working on lwip after a break of almost 3 months, and have 
updated my sources to CVS HEAD as of yesterday.
It seems on my lwip system that every outbound packet causes an ARP request for 
the recipient, even though the ARP table contains the recipient's information 
Looking at etharp.c, in the function etharp_output(), unicast packets get 
passed onto etharp_query(), with either their own IP address or that of the 
default gateway. etharp_query() causes an ARP request to *always* be sent, for 
*every* packet, before it even checks the ARP table! This doesn't seem right.
I would have thought the desired behaviour is to only send an ARP query if 
there is no matching entry in the Stable state. Comments?
Tony Mountifield
Contractor @ Tandberg TV
Strategic Park, ext 3390
Tel: 023 8057 3390

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