netdev - Re: TCP Congestion Control Algorithms

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Message-ID: <a45e9b40908311737kdafa7d2m80ebea5326e81933@mail.gmail.com>
Date:	Mon, 31 Aug 2009 19:37:34 -0500
From:	Lisong Xu <lisongxu2@...il.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	netdev@...r.kernel.org
Subject: Re: TCP Congestion Control Algorithms

Thanks, Stephen!
Lisong

On Mon, Aug 31, 2009 at 5:07 PM, Stephen Hemminger<shemminger@...tta.com> wrote:
> On Mon, 31 Aug 2009 16:10:59 -0500
> Lisong Xu <lisongxu2@...il.com> wrote:
>
>> Hello,
>>
>> Since there are multiple different TCP congestion control algorithms
>> available in Linux, a Linux server may use any of them.
>>
>> Is it possible for a regular user to find out the exact TCP congestion
>> control algorithm used by a Linux server? For example, if I am
>> downloading a file from a remote Linux server using a TCP flow, can I
>> find out whether this flow is a TCP/CUBIC flow, or TCP/Newreno, or
>> some other TCP protocol?
>>
>
> No. you might be able to some nmap style guessing, but no remote
> API. You can see locally on the server through /proc/sys/net
>
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