---
title: "Discussion on \"Finding an MTU Black Hole\" | Hashnode"
description: "Discussion on \"Finding an MTU Black Hole\". Why big transfers hang when ping works, and three ways to fix it"
url: "https://hashnode.com/posts/mtu-black-hole/6ad5323dd1a4c0ef2ace34a9"
---

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# [Finding an MTU Black Hole](https://josephoshaughnessy.hashnode.dev/mtu-black-hole?utm_source=hashnode&utm_medium=feed)

Why big transfers hang when ping works, and three ways to fix it

Oct 18 · 12 min read · josephoshaughnessy.hashnode.dev  
Updated Oct 25  
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-   [#networking](https://hashnode.com/tag/networking)
-   [#wireshark](https://hashnode.com/tag/wireshark)
-   [#troubleshooting](https://hashnode.com/tag/troubleshooting)
-   [#tcp](https://hashnode.com/tag/tcp)
-   [#linux](https://hashnode.com/tag/linux)

## Written by

[Joseph O'Shaughnessy](https://hashnode.com/@josephoshaughnessy)

@josephoshaughnessy · London, UK

  
[View profile](https://hashnode.com/@josephoshaughnessy)

Network engineer. Labs, packet captures and real-world troubleshooting.

Network engineer at an MSP, after starting out in the core network team at a small ISP. I lab things at home, break them, and write up what I learn, from packet captures and firewalls to routing and troubleshooting.

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