Azure VPN Gateway Slow

Curci, Andrea 0 Reputation points
2023-12-07T12:06:07.04+00:00

Hi Community,

I have a problem with the performance of the Site to Site VPN from Azure to on premises. My scenario is as follows:

I'm using a Test Subscription (for PoC) with 200$ Credit, VPN Virtual Gateway (VpnGw1 Gen 1) and 1 Virtual Machine and 1 Windows 365.

My Region is West Europe.

On Premises infrastructure is formed from 2 Fortinet 100F in HA and 1Gbps internet Up & Down (Used only for test, only 1 client connected).

From OnPremises Firewall i Set the MTU 1400 and MSS 1350 as best practice and i set the static route.

My problem is that whatever changes I make IPerf always returns me the same values which are not very satisfactory:

User's image

When i copy one file from on premises to cloud and vice versa, the speed is (maximum) 8 MB for second.

As a note: I tested (I think) every combination of algorithms, and also the VpnGw2 Gen 2 VPN

I have no more ideas, do you have any?

Thank you

Azure VPN Gateway
Azure VPN Gateway
An Azure service that enables the connection of on-premises networks to Azure through site-to-site virtual private networks.
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