Pings with a size > MTU fail - Red Hat Customer Portal

Log in to Your Red Hat Account

Your Red Hat account gives you access to your profile, preferences, and services, depending on your status.

If you are a new customer, register now for access to product evaluations and purchasing capabilities.

Need access to an account?

If your company has an existing Red Hat account, your organization administrator can grant you access.

If you have any questions, please contact customer service.

Red Hat Account Number:

Red Hat Account

Customer Portal

For your security, if you’re on a public computer and have finished using your Red Hat services, please be sure to log out.

Select Your Language

Issue

We have two nodes, a node 1 and a node 2. node 2 can ping to node 1 when the MTU is greater than 1500, but node 1 cannot ping node 2 in this same scenario.

node 1 -> node 2  = failure
node 2 -> node 1  = success

We can see this in the packet captures where node2 is receiving the fragmented ICMP echo request, but ignores them from the node1 host.
The command we are using is $ ping -s 1500 <node 2 IP> -c 10000
Data packets containing size greater than 1500 bytes(or MTU) is received but are not forwarded further.

Environment

Red Hat Enterprise Linux
Oracle cluster
ICMP

Subscriber exclusive content

A Red Hat subscription provides unlimited access to our knowledgebase of over 48,000 articles and solutions.

Current Customers and Partners

Log in for full access

Log In

New to Red Hat?

Learn more about Red Hat subscriptions

Welcome! Check out the Getting Started with Red Hat page for quick tours and guides for common tasks.

Here are the common uses of Markdown.

Code blocks

~~~
Code surrounded in tildes is easier to read
~~~

Links/URLs

[Red Hat Customer Portal](https://access.redhat.com)