speed issue with VPN access
We're using VPN access to internal network via APM access profiles and LDAP authentication. [F5 VE 11.4.1 - main tasks LTM (http-to-https VS redirect and SSL offload), device is not overloaded] Solution works fine but some users complaining about massive speed issue.
To investigate the issue I set up a BIG-IP Edge Client on Win7 test box via ADSL connection (speedtest.net: latency=29ms,down=12Mbps,up=0.9Mbps). As soon as I connect via VPN speedtest.net results showing a massive drop (speedtest.net: latency=461ms,down=0.55Mbps,up=0.37Mbps).
I have to admit that I don't have a detailed overview of the internal network but I know that Internet traffic passes through a proxy. Therefore I tried to 'eliminate' network topology and proxy by using "LAN Speed Test (Lite)" by Totusoft transfering test file to a share on a Win2008R2 box just two 'hops' behind the F5s internal subnet. The tool confirmed the bad throughput showing 0.85Mbps. Edge Client showed a throughput between 2.3Mbps (inbound) and 860Kbps (outbound) during the transfer (best values during write/read).
It appears that the VPN is throttling the bandwidth so much but how can I find out for sure that it is the F5 VPN? Do I need to optimize the (network) access profile? We're not using a Client Traffic Classifier to limit the traffic.
Any hint is much appreciated. cheers