From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH net-next] tcp: refine SYN handling in
 tcp_validate_incoming
Date: Wed, 18 Jul 2012 09:32:44 -0700 (PDT)
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From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Wed, 18 Jul 2012 00:29:30 +0200

> From: Eric Dumazet <edumazet@google.com>
> 
> Followup of commit 0c24604b68fc (tcp: implement RFC 5961 4.2)
> 
> As reported by Vijay Subramanian, we should send a challenge ACK
> instead of a dup ack if a SYN flag is set on a packet received out of
> window.
> 
> This permits the ratelimiting to work as intended, and to increase
> correct SNMP counters.
> 
> Suggested-by: Vijay Subramanian <subramanian.vijay@gmail.com>
> Signed-off-by: Eric Dumazet <edumazet@google.com>
> Acked-by: Vijay Subramanian <subramanian.vijay@gmail.com>

Applied.