netdev - Path MTU discovery and tuntap

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <20111121203359.GE2640@sie.protva.ru>
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
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html