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Re: [v6ops] Our IPv6-only home network and future experiments

Brian Candler <brian@nsrc.org> Mon, 15 April 2024 08:52 UTC

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Date: Mon, 15 Apr 2024 09:52:44 +0100
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To: Vasilenko Eduard <vasilenko.eduard@huawei.com>, "Soni \"They/Them\" L." <fakedme+ipv6@gmail.com>, IPv6 Operations <v6ops@ietf.org>
References: <91ee2782-c98a-4ccf-ae8f-71be571420b6@gmail.com> <7b89e8bd81674a61b364e1fec4176006@huawei.com> <5e65b7b4-b112-4875-a603-22b5e570619a@nsrc.org> <14eff54c01c24e0190397afff768efbb@huawei.com> <78b6ef7b-2ca5-455c-a727-f03964fe74b6@nsrc.org> <3bc5f6b440e24774a6c197460dc13399@huawei.com>
From: Brian Candler <brian@nsrc.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/v6ops/f8sJX0_eH4NLMw4Of3auezZkYcA>
Subject: Re: [v6ops] Our IPv6-only home network and future experiments
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On 15/04/2024 09:38, Vasilenko Eduard wrote:
>
> By the way, what if the application is developed with a different 
> language that does not use libc. Should it fail with literals?
>
> Or there is a need for modernization of all dynamic libraries in the 
> world?
>
Personally, I think that the long-term solution is for the kernel to 
integrate the CLAT work, either in its socket layer or as a separate 
CLAT device. There's already a third-party NAT46 module you can install 
to do the latter: you can find it linked from 
https://github.com/toreanderson/clatd

But I strongly support other initiatives which explore other approaches 
which could make this easier or quicker to deploy today.

With libc and LD_PRELOAD you could install a "shim" which intercepts 
certain calls, which would be very quick and easy to deploy. There's a 
very old example of this approach here (to make outbound connections 
bind to a specific IPv4 address):

https://daniel-lange.com/archives/53-Binding-applications-to-a-specific-IP.html
https://web.archive.org/web/20210420135325/http://www.ryde.net/code/bind.c.txt

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