What is path MTU discovery?

Updated -

Path MTU discovery is a simple protocol that aims to automatically find the optimal MTU (Maximum Transmission Unit ) for a TCP connections path. This helps to achieve optimum performance and network utilization.

Red Hat Enterprise Linux has path MTU discovery enabled by default. This may be verified by issuing the following command:

# cat /proc/sys/net/ipv4/ip_no_pmtu_dis...

Subscriber exclusive content

A Red Hat subscription provides unlimited access to our knowledgebase, tools, and much more.

Current Customers and Partners

Log in for full access

Log In

New to Red Hat?

Learn more about Red Hat subscriptions

Using a Red Hat product through a public cloud?

How to access this content