netdev - Re: [PATCH net] ipv6: tcp: drop silly ICMPv6 packet too big messages

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Date:   Wed, 7 Jul 2021 18:30:41 +0200
From:   Eric Dumazet <edumazet@...gle.com>
To:     Willy Tarreau <w@....eu>
Cc:     Eric Dumazet <eric.dumazet@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        netdev <netdev@...r.kernel.org>,
        Maciej Zenczykowski <maze@...gle.com>
Subject: Re: [PATCH net] ipv6: tcp: drop silly ICMPv6 packet too big messages

On Wed, Jul 7, 2021 at 6:27 PM Willy Tarreau <w@....eu> wrote:
>
> On Wed, Jul 07, 2021 at 06:25:10PM +0200, Eric Dumazet wrote:
> > On Wed, Jul 7, 2021 at 6:15 PM Willy Tarreau <w@....eu> wrote:
> >> One can hope that one day the issue will disappear.
>
> Aie. I thought you were speaking about million PPS. For sure if 10 pkt/s
> already cause harm, there's little to nothing that can be achieved with
> sampling!

Yes, these routes expire after 600 seconds, and the ipv6/max_size
default to 4096

After a few minutes, the route cache is full and bad things happen.