From: Andrew Morton <akpm@linux-foundation.org>
To: netdev@vger.kernel.org
Cc: bugzilla-daemon@bugzilla.kernel.org,
bugme-daemon@bugzilla.kernel.org, benoit.papillault@free.fr,
Jamal Hadi Salim <hadi@cyberus.ca>
Subject: Re: [Bugme-new] [Bug 14837] New: gretap does not fragment IP packets
Date: Fri, 18 Dec 2009 15:32:09 -0800 [thread overview]
Message-ID: <20091218153209.45042a58.akpm@linux-foundation.org> (raw)
In-Reply-To: <bug-14837-10286@http.bugzilla.kernel.org/>
(switched to email. Please respond via emailed reply-to-all, not via the
bugzilla web interface).
On Fri, 18 Dec 2009 23:10:01 GMT
bugzilla-daemon@bugzilla.kernel.org wrote:
> http://bugzilla.kernel.org/show_bug.cgi?id=14837
>
> Summary: gretap does not fragment IP packets
> Product: Networking
> Version: 2.5
> Kernel Version: 2.6.32
> Platform: All
> OS/Version: Linux
> Tree: Mainline
> Status: NEW
> Severity: normal
> Priority: P1
> Component: IPV4
> AssignedTo: shemminger@linux-foundation.org
> ReportedBy: benoit.papillault@free.fr
> Regression: No
>
>
> When gretap is used to encapsulate Ethernet packets into IP packets, the
> encapsulated IP packets are larger than the original Ethernet packet, as
> expected.
>
> Let's say you create a gre0 interface with a 1500 bytes MTU (since this
> interface will latter be inserted in a bridge interface, its MTU must be 1500).
> And Let's say the GRE encapsulated packet (now larger than 1500 bytes) is going
> to be routed over an IP interface with a 1500 bytes MTU.
>
> The expected behavior would be that the encapsulated packet be fragmented. The
> observed behavior is that any encapsulated packets over 1500 bytes are simply
> dropped and an ICMP "fragmentation needed" message is sent to ... who knows.
>
> My feeling is that DF bit is not playing nice here.
>
next parent reply other threads:[~2009-12-18 23:33 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bug-14837-10286@http.bugzilla.kernel.org/>
2009-12-18 23:32 ` Andrew Morton [this message]
2009-12-18 23:47 ` [Bugme-new] [Bug 14837] New: gretap does not fragment IP packets Stephen Hemminger
2009-12-19 12:55 ` jamal
2009-12-21 1:17 ` Benoit PAPILLAULT
2009-12-21 19:09 ` jamal
2010-01-07 14:30 ` Benoit PAPILLAULT
2010-01-10 16:03 ` jamal
2010-01-10 17:43 ` Benoit PAPILLAULT
2010-01-10 21:59 ` Herbert Xu
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