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<a href="https://gitlab.com/gene-gitlab">Gene</a>
<a href="https://gitlab.com/gnutls/gnutls/-/issues/1637#note_2285216840">commented</a>:
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<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">Sort of - here is summary of tcpdump - note that since I am on the internal network now I have replaced the IPs with client/server below and I am unable to share the full pcap file(s) for this reason.</p>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">But of course you can also run gnutle-cli client along with tcpdump on your end and compare with what happens using other clients.</p>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">I ran twice once with gnutls-cli and once with curl <a href="http://www.sapience.com/sitemap.xml" rel="nofollow noreferrer noopener" target="_blank" style="margin-top: 0;">www.sapience.com/sitemap.xml</a>
The first difference is at step 6 where server issues HRR to gnutls while for curl it replies with 'Server Hello'.</p>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">Within that client hello packet curl is sending key_share X25519 while gnutls sends 'secp256r1, x25519'.</p>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">There are other differences too. My apologies for not being able to share more but you can get a pcap on your client side too, though more work for you - sorry.</p>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">This is the summary of gnutls:</p>
<div class="gl-relative markdown-code-block js-markdown-code" style="margin-bottom: 0;">
<pre class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style='display: block; font-size: 14px; color: #3a383f; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 1rem; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; border-radius: .25rem; background-color: inherit; white-space: pre; margin-top: 0; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;">No Time Source Dest Proto Length Info</span>
<span id="LC2" class="line" lang="plaintext">------------------------------------------------------------</span>
<span id="LC3" class="line" lang="plaintext">1 0.000000 client server TCP 74 50170 → 443 [SYN] Seq=0 Win=64240 Len=0 MSS=1460 SACK_PERM TSval=644306766 TSecr=0 WS=128</span>
<span id="LC4" class="line" lang="plaintext"></span>
<span id="LC5" class="line" lang="plaintext">2 0.002485 server client TCP 74 443 → 50170 [SYN, ACK] Seq=0 Ack=1 Win=65160 Len=0 MSS=1460 SACK_PERM TSval=1428335904 TSecr=644306766 WS=128</span>
<span id="LC6" class="line" lang="plaintext"></span>
<span id="LC7" class="line" lang="plaintext">3 0.002526 client server TCP 66 50170 → 443 [ACK] Seq=1 Ack=1 Win=64256 Len=0 TSval=644306769 TSecr=1428335904</span>
<span id="LC8" class="line" lang="plaintext"></span>
<span id="LC9" class="line" lang="plaintext">4 0.002931 client server TLSv1.3 464 Client Hello (SNI=www.sapience.com)</span>
<span id="LC10" class="line" lang="plaintext">5 0.004983 server client TCP 66 443 → 50170 [ACK] Seq=1 Ack=399 Win=64768 Len=0 TSval=1428335907 TSecr=644306769</span>
<span id="LC11" class="line" lang="plaintext">6 0.005294 server client TLSv1.3 159 Hello Retry Request </span>
<span id="LC12" class="line" lang="plaintext"></span>
<span id="LC13" class="line" lang="plaintext">7 0.005295 server client TLSv1.3 72 Change Cipher Spec</span>
<span id="LC14" class="line" lang="plaintext">8 0.005325 client server TCP 66 50170 → 443 [ACK] Seq=399 Ack=94 Win=64256 Len=0 TSval=644306771 TSecr=1428335907</span>
<span id="LC15" class="line" lang="plaintext">9 0.005346 client server TCP 66 50170 → 443 [ACK] Seq=399 Ack=100 Win=64256 Len=0 TSval=644306772 TSecr=1428335907</span>
<span id="LC16" class="line" lang="plaintext">10 0.005561 client server TLSv1.3 395 Client Hello (SNI=www.sapience.com)</span>
<span id="LC17" class="line" lang="plaintext">11 0.008015 server client TLSv1.3 73 Alert (Level: Fatal, Description: Illegal Parameter)</span>
<span id="LC18" class="line" lang="plaintext">12 0.008017 server client TCP 66 443 → 50170 [FIN, ACK] Seq=107 Ack=728 Win=64512 Len=0 TSval=1428335910 TSecr=644306772</span>
<span id="LC19" class="line" lang="plaintext">13 0.008122 client server TCP 66 50170 → 443 [FIN, ACK] Seq=728 Ack=108 Win=64256 Len=0 TSval=644306774 TSecr=1428335910</span>
<span id="LC20" class="line" lang="plaintext">14 0.009992 server client TCP 66 443 → 50170 [ACK] Seq=108 Ack=729 Win=64512 Len=0 TSval=1428335912 TSecr=644306774</span></code></pre>
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