Hello everybody :)
we are using the ZyWALL USG 20W for VPN connection to our office. The connection is established thru L2TP over IPsec. We have noticed that when we use Apple MAC OS clients their is absolutely no problem with the connection. On Windows clients (7 and 10) the connection gets established but when some bigger packets gets send (ex. "top" ofer ssh to linux server) the connection gets frozen and I have to disconnect and reconnect or re-establish the ssh connection.
I checked for differences in the connection between windows and mac os and their is (as far as I know) only the difference in MTU on the VPN interface.
Mac OS X - MTU 1280
Windows 10 MTU 1400.
So I changed the MTU for the VPN interface in windows by typing:
netsh interface ipv4 set subinterface "[interface name here]" mtu=1280 store=persistent
And now it works perfectly.
So my question now is, how to force the USG router to establish a connection with the client so the MTU gets ajusted?
I see only a option to ajust the MSS value, but I dont have an idea to what value?
It is just a big problem to change on every client the MTU value on the interface.
Thanks in advance for your help!
↧