netdev - Re: ping: What's the purpose of rate limit?

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Message-ID: <CAM_iQpWBs1eUwfLprSsEFAtpMUWPY-jgXswzoHGck0DxxPQdZQ@mail.gmail.com>
Date:   Tue, 3 Jan 2017 22:45:17 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Guan Xin <guanx.bac@...il.com>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: ping: What's the purpose of rate limit?

Hi,

On Sat, Dec 31, 2016 at 4:04 AM, Guan Xin <guanx.bac@...il.com> wrote:
> Hello,
>
> Excuse me, I searched but didn't find an answer --
>
> What's the purpose of setting a limit to the "-i" and "-l" parameters
> of ping for non-root users?
>
> It seems that this is only intended to prevent accidental misuse
> because these restrictions can be easily worked around by starting
> multiple instances or wrapping the program in a loop, e.g.,
> while true; do ping -l3 -c3 192.168.0.1; done
>

I think the purpose of "-i" is not for rate limit, but for either hear beating
or monitoring latency periodically.

Thanks.