09-08-2018 01:00 PM - edited 09-08-2018 01:05 PM
Hi.
First let me say that I have managed to get some improvement to transfer speeds by tweaking the MTU setting on the tunnel interface for the GP VPN.
When I first started my testing, if I copied a single large file ( a 400 MB ISO ) from a remote server share to my VPN connected workstation, it was going pretty slow, only transferring at 1-2 MBps - we have a 100 Mbps fiber connection for our internet so I expected a much fast transfer. After tweaking the MTU on the tunnel interface, it now goes much faster (8-10 MBps)
Just so we are on the same data rate terms, 100Mbps should equate to appoximately 12.5 MBps - Windows always shows data transfers in storage terms, which uses the unit of Bytes per second, and we all know networking world likes to use bits per second 🙂
However, If I try to copy that file right back to the server from my remote client, I am lucky to get 800 KBps. Sometimes it will spike to 1-2 MBps, but then it will suddenly drop to zero and hang...
A few things to note:
- I am connecting from home, which also has a 100 Mbps connection, using a wired connection, full duplex 1Gbps.
- If I do the transfer test over an IPSEC tunnel, I do not have this problem (Tested from an Azure server that links to my on- prem network)
- My company network and GP VPN tunnel are not under a heavy load during these tests, in fact I was the only one on the GP VPN during these tests.
I had read that I should try enabling IPSEC for my GlobalProtect VPN setup, which I am willing to try, but I would like to understand why the throughput is so asymetrical using SSL VPN.
Has anyone else wrestled with this?
