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TCP Nagle + TCP Delayed ACKs can cause what appears to be the ClientHello being retransmitted.
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<div class="">Tweaking these TCP options will give you better initialization performance. </div>
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<div class="">TCP_NODELAY</div>
<div class="">TCP_QUICKACK</div>
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<div class="">This may not help the "end session" issue.</div>
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<div class="">-Todd Short</div>
<div class="">// <a href="mailto:tshort@akamai.com" class="">tshort@akamai.com</a></div>
<div class="">// "One if by land, two if by sea, three if by the Internet."</div>
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<div class="">On Aug 20, 2018, at 9:39 AM, Viktor Dukhovni <<a href="mailto:openssl-users@dukhovni.org" class="">openssl-users@dukhovni.org</a>> wrote:</div>
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<blockquote type="cite" class="">On Aug 17, 2018, at 6:43 AM, Konstantinos Schoinas <<a href="mailto:ece8537@upnet.gr" class="">ece8537@upnet.gr</a>> wrote:<br class="">
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So my dpdk application is responding with the correct TLS alert and it actually block the TLS session.I have seen the correct packet in wireshark as well.I am also putting a picture with this mail in order to see the process.<br class="">
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The problem is that VM1 using openssl takes 2 to 3 seconds to end the TLS session.Also i am getting some retransmits of client hello in wireshark.<br class="">
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Re-transmission is a feature of the kernel TCP stack, and OpenSSL<br class="">
has no control over this behaviour.<br class="">
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<blockquote type="cite" class="">So my question is if anyone can confirm that this is a problem of openssl or if not maybe something else.<br class="">
In addition if anyone know how much time does TLS session takes to actually end?<br class="">
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This *cannot* be an OpenSSL issue. Your DPI firewall must not be<br class="">
sending an ACK for the client HELLO payload. Or is otherwise<br class="">
failing to conform to TCP in a way that triggers re-transmission.<br class="">
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<span class="Apple-tab-span" style="white-space:pre"></span>Viktor.<br class="">
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