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  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Mon, 3 Aug 2020 17:24:50 +0300
From:   mastertheknife <mastertheknife@...il.com>
To:     David Ahern <dsahern@...il.com>
Cc:     netdev@...r.kernel.org
Subject: Re: PMTUD broken inside network namespace with multipath routing

Hi David,

In this case, both paths are in the same layer2 network, there is no
symmetric multi-path routing.
If original message takes path 1, ICMP response will come from path 1
If original message takes path 2, ICMP response will come from path 2
Also, It works fine outside of LXC.


Thank you,
Kfir

On Mon, Aug 3, 2020 at 4:32 PM David Ahern <dsahern@...il.com> wrote:
>
> On 8/3/20 5:14 AM, mastertheknife wrote:
> > What seems to be happening, is that when multipath routing is used
> > inside LXC (or any network namespace), the kernel doesn't generate a
> > routing exception to force the lower MTU.
> > I believe this is a bug inside the kernel.
> >
>
> Known problem. Original message can take path 1 and ICMP message can
> path 2. The exception is then created on the wrong path.

Powered by blists - more mailing lists