netdev - Re: ipv6:ping ipv6 address on the same host from the loopback

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Message-ID: <6e4e9126-f2a7-8d3f-9fa2-264745d3364e@kernel.org>
Date:   Thu, 9 Feb 2023 13:03:08 -0700
From:   David Ahern <dsahern@...nel.org>
To:     gaoxingwang <gaoxingwang1@...wei.com>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, yoshfuji@...ux-ipv6.org,
        chenzhen126@...wei.com, liaichun@...wei.com, yanan@...wei.com
Subject: Re: ipv6:ping ipv6 address on the same host from the loopback

On 2/9/23 6:42 AM, gaoxingwang wrote:
> When I ping another ipv6 address on the same host from the loopback interface, it fails.
> Is this what was expected? Or should it work successfully like ipv4?

IMHO, ipv4 should not work; I do not recall the origins of why it does -
meaning intentional or byproduct of using the loopback device to
"transmit" packets locally.