netdev - Path MTU discovery and tuntap

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Date:	Tue, 22 Nov 2011 00:33:59 +0400
From:	"Eugene B. Berdnikov" <bd4@...tva.ru>
To:	netdev@...r.kernel.org
Subject: Path MTU discovery and tuntap

  Hi folks.

 I have two routers running a tun-based tunneling applications.
 Both forward packets from eth (mtu=1500) to tun (mtu=1300),
 emitting icmp[frag-need] if DF=1 and packet size > 1300. That's nice.
 But one router simply drops oversized packet after icmp emittion,
 and other one delivers oversized packet to application's tun.
 The difference is that 1st router runs 2.6.30 (it drops packet) and
 the 2nd runs 3.0.0 (delivers to app). Kernels are from Debian/testing.

 The question is: was it an intentional change or some bug?
-- 
 Eugene Berdnikov
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