netdev - Re: VPN traffic leaks in IPv6/IPv4 dual-stack networks/hosts

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Message-ID: <1354032252.14302.37.camel@edumazet-glaptop>
Date:	Tue, 27 Nov 2012 08:04:12 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Fernando Gont <fernando@...t.com.ar>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: VPN traffic leaks in IPv6/IPv4 dual-stack networks/hosts

On Tue, 2012-11-27 at 11:54 -0300, Fernando Gont wrote:
> Folks,
> 
> FYI. This is might affect Linux users employing e.g. OpenVPN:
> <http://tools.ietf.org/html/draft-gont-opsec-vpn-leakages>.
> 
> For a project such as OpenVPN, a (portable) fix might be non-trivial.
> However, I guess Linux might hook some iptables rules when establishing
> the VPN tunnel, such that e.g. all v6 traffic is filtered (yes, this is
> certainly not the most desirable fix, but still probably better than
> having your supposedly-secured traffic being sent in the clear).
> 
> P.S.: Not sure if this is the right list to send this note. Please
> advice of a more appropriate one and/or feel free to forward this note
> if deemed appropriate...

This seems a user space issue to me.

accept_ra on linux is set to 1, meaning that as soon as forwarding is
enabled, RA are ignored.



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