Manually Set MTU for Network Connect/Pulse

[cyerage]

Is there a way to set the MTU within Network Connect or Pulse?  We are seeing issues and believe it may be related to MTU size.  We would like to test connecting with a smaller MTU size using either the Network Connect (preferably) or Pulse VPN client.  We would rather make the change client side rather than VPN device side for testing.

[[email protected]]

Hi @cyerage

From my understanding, virtual adapter's MTU size will be determined based on the MTU value set on the Internal Port of the VPN server (Configured-value 'minus' 100) and it will be pushed as one of the connection parameters.

FYI, I have used Windows "netsh" command to modify the MTU value for LAN/WiFi adapters, however I am not sure if we can do the same for virtual adapters.

@zanyterp Any thoughts ?

Below is the command used to modify the MTU value for physical interfaces:

1.Type netsh interface ipv4 show subinterface

2.Press Enter.

3.You will see a list of network interfaces.

4.Type netsh interface ipv4 set subinterface “Local Area Connection” mtu=1430 store=persistent

5.You should replace Local Area Connection with the name that appeared in the “Interface” column from steps 1-3.

6.Press Enter and restart you computer.

Thanks,
Ray.

[zanyterp · Accepted solution]

@cyerage: no, it cannot be set manually. it is calculated by subtracting 100 from the lowest MTU of either the NIC you are connecting to on the PCS or the local adapter of the machine (or something in the way).

[email protected]: yup, it is not something that can be done