[openssl-users] OpenSSL Behaviour under low bandwidth

Martin Beynon mebeyn at gmail.com
Fri May 15 11:16:00 UTC 2015

Hi Rich,

Thanks for your quick response.

It does...and I do wonder if it has something to do with the bandwidth
limiting / traffic shaping feature on the DrayTek router that I'm using to
simulate low bandwidth.

The reason I am looking at this now is because I'm experiencing some
customer issues in the wild, and the only common factor is low bandwidth...
So network issues seem unlikely, plus if I add some delay in my application
to slow the rate at which I feed data to openssl the problem goes away, and
it only occurs below 150 kpbs (getting noticeably worse as I approach 56



On 15 May 2015 at 12:00, Salz, Rich <rsalz at akamai.com> wrote:

> >I've tested with s_client between my PC and an AWS EC2 instance. I've
> also tried using s_tunnel and nmap/ncat. The results appear the same. Using
> wireshark I see a lot of TCP retransmissions.
> That sounds like a network issue.  Try testing using something like netcat
> and see if you also get TCP retransmissions.
> --
> Senior Architect, Akamai Technologies
> IM: richsalz at jabber.at Twitter: RichSalz
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