From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Dumazet <eric.dumazet@gmail.com>
Subject: Re: [PATCH] net: Add default_advmss() methods to blackhole dst_ops
Date: Fri, 18 Feb 2011 14:24:03 +0100
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Cc: George Spelvin <linux@horizon.com>,
	David Miller <davem@davemloft.net>,
	linux-kernel@vger.kernel.org, netdev <netdev@vger.kernel.org>,
	Roland Dreier <roland@purestorage.com>
To: Changli Gao <xiaosuo@gmail.com>
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Le vendredi 18 f=C3=A9vrier 2011 =C3=A0 21:16 +0800, Changli Gao a =C3=A9=
crit :

> I am wondering why magic number 256 is used here. Is there a special
> reason? Thanks.
>=20

It really doesnt matter. SYN message will be dropped anyway.

256 happens to be the default value
of /proc/sys/net/ipv4/route/min_adv_mss