mmtu Command

Purpose

Displaying, adding, and deleting maximum transfer unit (MTU) values used for path MTU discovery.

Syntax

mmtu { -a Value | -d Value | -s }

Description

Use the mmtu command to display, add, and delete maximum transfer unit (MTU) values to the list of potential path MTU values. Path MTU discovery uses the list of potential path MTU values to detect the path MTU. The list of potential path MTU values is only used when there are routers in the path that do not comply with RFC 1191. The user must have administrative authority to add or delete MTU values.

Note: The -a and -d flags used to modify the list of potential path MTU values are disallowed when executed within workload partitions.

Flags

Item	Description
-a Value	Adds the new MTU to the list of potential path MTU values.
-d Value	Deletes the value from the list of potential path MTU values.
-s	Displays the current list of potential path MTU values.

Security

Attention RBAC users and Trusted AIX users: This command can perform privileged operations. Only privileged users can run privileged operations. For more information about authorizations and privileges, see Privileged Command Database in AIX® Version 7.1 Security. For a list of privileges and the authorizations associated with this command, see the lssecattr command or the getcmdattr subcommand.

Examples

To add a value to the list of potential path MTU values, enter:
```
mmtu -a mtu-value
```
To delete a value from the list of potential path MTU values, enter:
```
mmtu -d mtu-value
```
To display the contents of the list of potential path MTU values, enter:
```
mmtu -s
```

Files

Item	Description
/usr/sbin/mmtu	Contains the mmtu command.