Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?


path-mtu-discovery (Tunnel)


Hierarchy Level


Configure path MTU discovery for outgoing tunnel connections:

  • path-mtu-discovery—Path MTU discovery is enabled.

  • no-path-mtu-discovery—Path MTU discovery is disabled.


Starting in Junos OS Release 17.2R1, the no-path-mtu-discovery configuration statement in the [edit interfaces ip-fpc/pic/port unit logical-unit-number tunnel] and [edit interfaces gr-fpc/pic/port unit logical-unit-number tunnel] hierarchies is no longer available for ipip6 tunnels.


Path MTU discovery is enabled.

Required Privilege Level

system—To view this statement in the configuration.

system-control—To add this statement to the configuration.

Release Information

Statement introduced before Junos OS Release 7.4.