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Can we fix it ?</div>
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<span style="font-family: "Aptos Mono", Aptos_EmbeddedFont, Aptos_MSFontService, monospace; font-size: 12pt; color: rgb(0, 0, 0);">Thanks & Regards,<br>
Samyak Jain<br>
Software Engineer</span><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"><br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Stephen Hemminger <stephen@networkplumber.org><br>
<b>Sent:</b> Monday, June 15, 2026 11:07 PM<br>
<b>To:</b> Samyak Jain <samyak.jain@amantyatech.com><br>
<b>Cc:</b> dev@dpdk.org <dev@dpdk.org>; Vikash kumar <vikash.kumar@amantyatech.com>; Ankur Bharadwaj <ankur.bharadwaj@amantyatech.com><br>
<b>Subject:</b> Re: Question regarding duplicate fragment handling in DPDK IP reassembly library</font>
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<div class="PlainText">$B"%(B CAUTION: This e-mail originated from OUTSIDE the organization. Please do not click links or open attachments from an unknown or suspicious origin.<br>
<br>
<br>
On Mon, 15 Jun 2026 12:39:48 +0000<br>
Samyak Jain <samyak.jain@amantyatech.com> wrote:<br>
<br>
> Hi DPDK Community,<br>
><br>
> I am using DPDK 25.11 and evaluating the IP reassembly library<br>
> (librte_ip_frag).<br>
><br>
> During testing, I observed that duplicate fragments appear to cause reassembly failure and the fragment context gets invalidated.<br>
><br>
> I would like to know:<br>
><br>
> 1. Is duplicate fragment handling intentionally unsupported in<br>
> rte_ipv4_frag_reassemble_packet() / rte_ipv6_frag_reassemble_packet()?<br>
><br>
> 2. Has there been any upstream discussion or patch to support<br>
> duplicate fragments while still rejecting conflicting<br>
> fragments?<br>
><br>
> 3. Are there any recommended approaches for applications that need<br>
> Linux-like duplicate fragment tolerance?<br>
><br>
> Any guidance would be appreciated.<br>
><br>
> Thanks & Regards,<br>
> Samyak Jain<br>
><br>
<br>
Short answer: yes it is buggy, no it shouldn't be.<br>
Looking into it but not a simple answer<br>
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