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How to Configure MTU and MSS Settings from the CLI - Knowledge Base - Palo Alto Networks

How to Configure MTU and MSS Settings from the CLI

60897
Created On 09/25/18 17:52 PM - Last Modified 02/02/21 00:10 AM


Environment


  • Palo Alto Firewall.
  • PAN-OS 8.1 and above.


Resolution


Note: Enter the commands in configure mode.

MTU values can be set on the interface level.

Management Interface:
# set deviceconfig system mtu <value>
Dataplane Interface: 
# set network interface ethernet ethernet1/3 layer3 mtu <value>

MSS values can be adjusted only at the interface level.

# set network interface ethernet ethernet1/3 layer3 adjust-tcp-mss enable yes

This sets the mss value based on MTU. Generally reduces the 20+20 (Layer 3 and Layer 4 headers) bytes from MTU value.

 



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