How to change MTU on PANGP Virtual Adapter used by GlobalProtect App

Windows OS (GP App)

MacOS (GP App)

By default, PANGP Virtual Adapter has MTU=1400

1. Windows GP client 5.0.x and older: MTU can be changed by modifying PANGP virtual adapter MTU setting directly as follows:

a. use netsh command to change the MTU size: (<index> is the virtual interface index, use 'netsh interface ipv4 show interfaces' to list all interface indexes and names)
netsh interface ipv4 set interface <index> mtu=1300
netsh interface ipv6 set interface <index> mtu=1300
 * You can add store=persistent if you want to retain the change after reboots.

b. use powershell command to automatically find out virtual interface and set mtu
powershell -Command "Get-WmiObject win32_networkadapter | where-object ServiceName -eq PanGpd | ForEach {netsh interface ipv4 set interface $_.InterfaceIndex mtu=1300; netsh interface ipv6 set interface $_.InterfaceIndex mtu=1300}"

2. Mac GP client: ifconfig can change virtual adapter MTU size:

ifconfig gpd0 mtu 1300