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tunnel-mtu (Services IPsec VPN)


Hierarchy Level


Maximum transmission unit (MTU) size for IPsec tunnels. This defines the maximum size of an IP packet, including the IPsec overhead.


bytes—MTU size.

  • Default: 1500 bytes

  • Range: 256 through 9192 bytes


Clear the IPsec SA in tunnel-mtu to accomodate Jumbo frames larger than 1500 bytes.

Required Privilege Level

interface—To view this statement in the configuration.

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

Release Information

Statement introduced in Junos OS Release 7.5.