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Date:   Fri, 20 Nov 2020 13:22:19 -0700
From:   David Ahern <dsahern@...il.com>
To:     Andreas Roeseler <andreas.a.roeseler@...il.com>,
        davem@...emloft.net
Cc:     kuznet@....inr.ac.ru, yoshfuji@...ux-ipv6.org, kuba@...nel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 net-next 0/3] add support for sending RFC8335 PROBE

On 11/20/20 10:27 AM, Andreas Roeseler wrote:
> On Thu, 2020-11-19 at 21:01 -0700, David Ahern wrote:
>> On 11/19/20 8:51 PM, David Ahern wrote:
>>> On 11/17/20 5:46 PM, Andreas Roeseler wrote:
>>>> The popular utility ping has several severe limitations such as
>>>> the
>>>> inability to query specific  interfaces on a node and requiring
>>>> bidirectional connectivity between the probing and the probed
>>>> interfaces. RFC8335 attempts to solve these limitations by
>>>> creating the
>>>> new utility PROBE which is a specialized ICMP message that makes
>>>> use of
>>>> the ICMP Extension Structure outlined in RFC4884.
>>>>
>>>> This patchset adds definitions for the ICMP Extended Echo Request
>>>> and
>>>> Reply (PROBE) types for both IPv4 and IPv6. It also expands the
>>>> list of
>>>> supported ICMP messages to accommodate PROBEs.
>>>>
>>>
>>> You are updating the send, but what about the response side?
>>>
>>
>> you also are not setting 'ICMP Extension Structure'. From:
>> https://tools.ietf.org/html/rfc8335
>>
>>    o  ICMP Extension Structure: The ICMP Extension Structure
>> identifies
>>       the probed interface.
>>
>>    Section 7 of [RFC4884] defines the ICMP Extension Structure.  As
>> per
>>    RFC 4884, the Extension Structure contains exactly one Extension
>>    Header followed by one or more objects.  When applied to the ICMP
>>    Extended Echo Request message, the ICMP Extension Structure MUST
>>    contain exactly one instance of the Interface Identification
>> Object
>>    (see Section 2.1).
> 
> I am currently finishing testing and polishing the response side and
> hope to be sendding out v1 of the patch in the upcoming few weeks.

send the response side with the request side -- 1 set of patches for the
entire feature.

> 
> As for the 'ICMP Extension Structure', I have been working with the
> iputils package to add a command to send PROBE messages, and the
> changes included in this patchset are all that are necessary to be able
> to send PROBEs using the existing ping framework.
> 

right.

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