linux-kernel - Re: [PATCH net-next v2] net/ipv6: Introduce accept_unsolicited_na knob to implement router-side changes for RFC9131

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Date:   Mon, 11 Apr 2022 10:13:44 -0600
From:   David Ahern <dsahern@...nel.org>
To:     Arun Ajith S <aajith@...sta.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        yoshfuji@...ux-ipv6.org, kuba@...nel.org, pabeni@...hat.com,
        corbet@....net, prestwoj@...il.com, gilligan@...sta.com,
        noureddine@...sta.com, gk@...sta.com
Subject: Re: [PATCH net-next v2] net/ipv6: Introduce accept_unsolicited_na
 knob to implement router-side changes for RFC9131

On 4/11/22 9:41 AM, Arun Ajith S wrote:
> 
> mausezahn doesn't have good support for ICMPv6.
> I tried using --type icmp6 -t icmp6 "type=136, payload=<HEX-PAYLOAD>"
> to manually craft a NA packet with  the target address and the target
> ll addr option.
> But it still doesn't allow me to set the flags to mark it as an
> unsolicited advertisement.
> 
> How about this alternative for a test:
> 1. Setup a veth tunnel across two namespaces, one end being the host
> and the other the router.
> 2. On the host side, I can configure
> net.ipv6.conf.<interface>.ndisc_notify to send out unsolicited NAs.
> 3. On the router side, I can try out various combinations of
> (accept_unsolicited_na, drop_unsolicted_na and forwarding)
> 

that works too. even simpler.