Thursday, 5 March 2026

mtu issue on eir home connections, vpn not working

MTU on palo alto global protect is set to 1300

The MTU was changed on the Global Protect side but nothing worked for EIR connections

This was the fix after working with Palo Support. 

On user Laptop depending if they are using the the WiFi or Ethernet Connection we need to adjust the MTU on the interface


This command will list your interfaces and the index of them

netsh interface ipv4 show interfaces


This command will change the MTU on the index we want to change where 19 is the index of the interface

netsh interface ipv4 set interface 19 mtu=1300


So what you need to do is run the command netsh interface ipv4 show interfaces to list the interfaces.

If you are using wifi or lan identify it by the index number and then run the command netsh interface ipv4 set interface 19 mtu=1300  to change it


test the connection to see if it works


if it works you can run the command  netsh interface ipv4 set interface 19 mtu=1300 store=persistent - this will save the setting even after a reboot

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