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Configuring the Junos OS for IP-IP Path MTU Discovery on IP-IP Tunnel Connections

By default, path maximum transmission unit (MTU) discovery on outgoing IP-IP tunnel connections is enabled.

To disable IP-IP path MTU discovery, include the no-ipip-path-mtu-discovery statement at the [edit system internet-options] hierarchy level:

[edit system internet-options]no-ipip-path-mtu-discovery;

To reenable IP-IP path MTU discovery, include the ipip-path-mtu-discovery statement at the [edit system internet-options] hierarchy level:

[edit system internet-options]ipip-path-mtu-discovery;