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Re: [secdir] Routing loop attacks using IPv6 tunnels

Brian E Carpenter <brian.e.carpenter@gmail.com> Sat, 12 September 2009 01:26 UTC

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Date: Sat, 12 Sep 2009 13:26:32 +1200
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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To: "Templin, Fred L" <Fred.L.Templin@boeing.com>
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Cc: v6ops <v6ops@ops.ietf.org>, Christian Huitema <huitema@microsoft.com>, ipv6@ietf.org, secdir@ietf.org
Subject: Re: [secdir] Routing loop attacks using IPv6 tunnels
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On 2009-09-12 11:12, Templin, Fred L wrote:
> Brian,
> 
>> -----Original Message-----
>> From: Brian E Carpenter [mailto:brian.e.carpenter@gmail.com]
>> Sent: Friday, September 11, 2009 4:06 PM
>> To: Templin, Fred L
>> Cc: Christian Huitema; v6ops; ipv6@ietf.org; secdir@ietf.org
>> Subject: Re: Routing loop attacks using IPv6 tunnels
>>
>> On 2009-09-12 09:13, Templin, Fred L wrote:
>>
>> (much text deleted)
>>
>>> Otherwise, the best solution IMHO
>>> would be to allow only routers (and not hosts) on the
>>> virtual links.
>> This was of course the original intention for 6to4, so
>> that any misconfiguration issues could be limited to presumably
>> trusted staff and boxes. Unfortunately, reality has turned out
>> to be different, with host-based automatic tunnels becoming
>> popular.
> 
> Thanks. I was rethinking this a bit after sending, and
> I may have been too premature in saying routers only
> and not hosts.
> 
> What I would rather have said was that mechanisms such as
> SEcure Neighbor Discovery (SEND) may be helpful in private
> addressing domains where spoofing is possible. Let me know
> if this makes sense.

Except for the practical problems involved in deploying SEND.
We still have an issue in unmanaged networks.

    Brian

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