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Configuring the Junos OS for Path MTU Discovery on Outgoing TCP Connections
By default, path MTU discovery on outgoing TCP connections is enabled. To disable path MTU discovery, include the no-path-mtu-discovery statement at the [edit system internet-options] hierarchy level:
[edit system internet-options]no-path-mtu-discovery;
To reenable path MTU discovery on outgoing TCP connections, include the path-mtu-discovery statement at the [edit system internet-options] hierarchy level:
[edit system internet-options]path-mtu-discovery;
