netdev - Re: IPv6 nexthop for IPv4

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

Date:	Thu, 26 Mar 2015 11:43:36 -0400
From:	"John W. Linville" <linville@...driver.com>
To:	Bjørnar Ness <bjornar.ness@...il.com>
Cc:	Sowmini Varadhan <sowmini05@...il.com>,
	netdev <netdev@...r.kernel.org>,
	Andy Gospodarek <gospo@...ulusnetworks.com>
Subject: Re: IPv6 nexthop for IPv4

On Thu, Mar 26, 2015 at 04:10:21PM +0100, Bjørnar Ness wrote:
> 2015-03-26 15:53 GMT+01:00 Sowmini Varadhan <sowmini05@...il.com>:
> > On Thu, Mar 26, 2015 at 10:39 AM, Bjørnar Ness <bjornar.ness@...il.com> wrote:
> >
> >>>> ip route add 10.0.0.0/16 via fe80::225:90ff:fed3:bfb4/64 dev sfp0
> >>>
> >>> Trying to understand what the desired behavior is, for the route
> >>> above: if I send a packet from 10.0.0.1 to 10.0.0.2, you want the dst-mac
> >>> to be the mac address of e80::225:90ff:fed3:bfb4???
> >>
> >> Absolutely, correct.
> >
> > What if the current node does not want to support ipv6? This sounds
> > pretty "creative", if this can work, you might as well make the nexthop to
> > be the L2 address of the gw.
> 
> If it does not support IPv6 I guess the route command will fail! This
> is a bad argument
> against this. Dont see the point of limiting nexthop to L2

This topic was discussed at the recent Netconf event in Ottawa.
This is a viable means of interconnecting two IPv4 "island" subnets
across an IPv6 "ocean" backplane.

Andy Gospodarek gave a short discussion on the topic, and IIRC it
was warmly received.  I'll Cc him on this message -- I think he had a
(fairly simple) patch more or less ready.

Hth!

John
-- 
John W. Linville		Someday the world will need a hero, and you
linville@...driver.com			might be all we have.  Be ready.
--
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