netdev - Why UDP can't confirm ARP state?

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Message-ID: <CAF1ivSZ=f_swEhaeEtbdkbVu=e1ZUSw=e0BF6+TZXW=HoTk0EA@mail.gmail.com>
Date:	Sat, 17 Aug 2013 01:07:19 +0800
From:	Lin Ming <minggr@...il.com>
To:	networking <netdev@...r.kernel.org>
Subject: Why UDP can't confirm ARP state?

Hi list,

When TCP receives a packet, it can confirm the related ARP cache entry
in REACHABLE state.
Why can't UDP?

I think it's because UDP is connectionless.
But I don't get the exact reason.

Any hint?

Thanks,
Lin Ming
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