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Re: [Banana] Charter

"Brian Trammell (IETF)" <ietf@trammell.ch> Thu, 14 September 2017 05:36 UTC

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From: "Brian Trammell (IETF)" <ietf@trammell.ch>
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Date: Thu, 14 Sep 2017 07:36:37 +0200
In-Reply-To: <4552F0907735844E9204A62BBDD325E7A65EC703@NKGEML515-MBX.china.huawei.com>
Cc: "Henderickx, Wim (Nokia - BE/Antwerp)" <wim.henderickx@nokia.com>, "mrcullen42@gmail.com" <mrcullen42@gmail.com>, Alexandre Petrescu <alexandre.petrescu@gmail.com>, "banana@ietf.org" <banana@ietf.org>
To: "Zhangmingui (Martin)" <zhangmingui@huawei.com>
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Subject: Re: [Banana] Charter
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> On 14 Sep 2017, at 05:07, Zhangmingui (Martin) <zhangmingui@huawei.com> wrote:
> 
> Hi Alex,
> 
> If "GRE passthrough NAT" was proved to be really required, there are two options:
> 1. GRE in UDP while the UDP provides you the port number.
> 2. The GRE Key field to be used to carry the port number.
> For the second option, there are some existing implementations. But it is not an option if the Key field has already used for other purpose, e.g., security.
> 
> However, I would say the popular usage is that the NAT happens just before the GRE tunnel. Why do we have to insert a NAT device in between two GRE tunnel endpoints?

I think the issue here would be double-NAT; i.e., a BANANA Box located on a home router, so one device performs both NAT for the local network and bandwidth aggregation, sitting on CG-NATted space on at least one of its access networks.

IMO situations like this are a good reason for BANANA to support multiple encapsulations.

Cheers,

Brian

> 
> Thanks,
> Mingui
> 
> ________________________________________
> From: Banana [banana-bounces@ietf.org] on behalf of Henderickx, Wim (Nokia - BE/Antwerp) [wim.henderickx@nokia.com]
> Sent: Thursday, September 14, 2017 0:51
> To: mrcullen42@gmail.com
> Cc: Alexandre Petrescu; banana@ietf.org
> Subject: Re: [Banana] Charter
> 
> How will you sent GRE through NAT. GRE has no port number
> 
> On 13/09/2017, 17:27, "mrcullen42@gmail.com" <mrcullen42@gmail.com> wrote:
> 
>    Hi Wim,
> 
>    Sent from my iPhone
> 
>> If I hear GRE as a proposal it is very NAT unfriendly and the solution need to work across multiple providers, so this is an important consideration.
> 
>    Sorry, I somehow dropped this thread while I was in vacation...
> 
>    Why do you think that (all) GRE-based proposal(s) would be NAT unfriendly?
> 
>    Margaret
> 
> 
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