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HRC_ITguy's avatar
HRC_ITguy
Aspirant
Jun 21, 2018

SRX5308 L2TP/IPSec VPN on Windows 10 - Slow Throughput

I have an SRX5308 running firmware v4.3.5-3 and a VPN setup based on the configuration provided by train_wreck in this thread.  WAN1 is on a fiber connection that reliably tests at 500/25 Mbps.  The remote Windows 10 laptop tests at 100/15 Mbps.

 

The problem I am experiencing is that VPN throughput is speed testing at an abysmal 3/5 Mbps.  File transfers from the box to the client run anywhere from 300 to 700 Kbps.  I attempted adjusting the MTU according to this Netgear KB article, which doesn't matter much because Windows 10 automatically places an MTU limit of 1400 on VPN connections.

 

After a full day of tweaking, testing, and troubleshooting, I'm at a loss and would appreciate any assistance in getting this issue resolved.

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