Ending the "silent drop": how Dynamic Path MTU Discovery makes the Cloudflare One Client more resilient
Mar 5, 2026Koko Uko, Rhett Griggs, Todd Murray
Summary
This post introduces Dynamic Path MTU Discovery (PMTUD) to the Cloudflare One Client, enhancing its resilience against 'PMTUD Black Holes'. It details how the client actively probes network paths to determine optimal packet sizes, moving beyond reliance on potentially dropped ICMP messages. This ensures stable connections for users across various network conditions, particularly benefiting mission-critical applications like those used by first responders and hybrid workers.
More from the Website Security & Threat Management trail
- We tested our own WAF with frontier AI models. Here’s what we found
- When scanners miss the attack: how Cloudflare Client-Side Security protects storefronts
- Introducing automatic remediation policies with Cloudflare CASB
- Introducing context-aware vulnerability discovery and remediation with Cloudflare Managed Defense and OpenAI Daybreak Models
- Introducing Adaptive Intelligence: undermining the economics of every bot attack