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The earliest recollection of this bug is traced back to PAN-OS 9.1.2 - July 22, 2025. This bug is fixed in PAN-OS versions 9.1.2. ( PA-7000 Series and PA-3200 Series firewalls only ) Fixed an issue where when jumbo frames were enabled, the maximum transmission unit (MTU) size limit was lower than expected. For more information: https://docs.paloaltonetworks.com/pan-os/9-1/pan-os-release-notes/pan-os-9-1-addressed-issues/pan-os-9-1-2-addressed-issues
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