[USG Flex H] - MTU Jumbo Frames

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Maverick87
Maverick87 Posts: 490
Zyxel Certified Network Administrator - WLAN Zyxel Certified Network Administrator - Nebula Zyxel Certified Network Administrator - Security Zyxel Certified Sales Associate
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in USG FLEX H Series

Hello everyone,
I've a NAS that support MTU Jumbo Frames up to 9000 bytes.

Recently, I've notice that the USG Flex 500H support up to 1500 bytes, so not support Jumbo Frames.

How is possible to increase the MTU size on the flex?

Thank you

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  • Zyxel_Luna
    Zyxel_Luna Posts: 113
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    Hi @Maverick87,

    Thank you for contacting us.

    Currently, the USG FLEX 500H does not support Jumbo Frames (the MTU is capped at 1500 bytes), and unfortunately, there are no current plans to implement this feature.

    To enable 9000-byte MTU transfers between your NAS and client devices, you may consider keeping them on the same Layer 2 switch within the same subnet/VLAN. This allows local traffic to be switched directly at Layer 2 without routing through the firewall.

    Thank you for your understanding.

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  • Zyxel_Luna
    Zyxel_Luna Posts: 113
    5 Answers First Comment Friend Collector
    image  Zyxel Employee
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    Hi @Maverick87,

    Thank you for contacting us.

    Currently, the USG FLEX 500H does not support Jumbo Frames (the MTU is capped at 1500 bytes), and unfortunately, there are no current plans to implement this feature.

    To enable 9000-byte MTU transfers between your NAS and client devices, you may consider keeping them on the same Layer 2 switch within the same subnet/VLAN. This allows local traffic to be switched directly at Layer 2 without routing through the firewall.

    Thank you for your understanding.

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