netdev - Re: [PATCH v3 net-next] ipv6: Implement draft-ietf-6man-rfc4941bis

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Message-Id: <20200506.170018.550097165407520983.davem@davemloft.net>
Date:   Wed, 06 May 2020 17:00:18 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     fgont@...networks.com
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH v3 net-next] ipv6: Implement draft-ietf-6man-rfc4941bis

From: Fernando Gont <fgont@...networks.com>
Date: Fri, 1 May 2020 00:51:47 -0300

> Implement the upcoming rev of RFC4941 (IPv6 temporary addresses):
> https://tools.ietf.org/html/draft-ietf-6man-rfc4941bis-09
> 
> * Reduces the default Valid Lifetime to 2 days
>   The number of extra addresses employed when Valid Lifetime was
>   7 days exacerbated the stress caused on network
>   elements/devices. Additionally, the motivation for temporary
>   addresses is indeed privacy and reduced exposure. With a
>   default Valid Lifetime of 7 days, an address that becomes
>   revealed by active communication is reachable and exposed for
>   one whole week. The only use case for a Valid Lifetime of 7
>   days could be some application that is expecting to have long
>   lived connections. But if you want to have a long lived
>   connections, you shouldn't be using a temporary address in the
>   first place. Additionally, in the era of mobile devices, general
>   applications should nevertheless be prepared and robust to
>   address changes (e.g. nodes swap wifi <-> 4G, etc.)
> 
> * Employs different IIDs for different prefixes
>   To avoid network activity correlation among addresses configured
>   for different prefixes
> 
> * Uses a simpler algorithm for IID generation
>   No need to store "history" anywhere
> 
> Signed-off-by: Fernando Gont <fgont@...networks.com>

Applied, thanks.