UP POINTOPOINT RUNNING NOARP MULTICAST MTU:0 Metric:1 FGT-OnPrem # fnsysctl ifconfig OnPrem-Azure The MTU had a value of zero and there were many errors regarding RX packets. We did the same at the OnPrem site and the figures weren’t great at all. TX packets:2908302 errors:5 dropped:0 overruns:0 carrier:0 RX packets:832464 errors:0 dropped:0 overruns:0 frame:0 UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1438 Metric:1 The MTU and packet statistics looked good: FGT-Azure # fnsysctl ifconfig Azure-OnPrem We’ve then checked the IPsec interface at the Azure site. The results were nowhere near the expected numbers, while sending from Azure to OnPrem (~250Mbit/s) was a bit faster than reverse (~120Mbit/s). ![]() We’ve created a basic IPsec tunnel using the wizard, deployed an Ubuntu machine at both sites and used iPerf3 to do some speed testing. Based on two recent support cases regarding the IPsec performance between an OnPrem and Azure FortiGate, we did some testing using the latest FortiOS 6.4.1.
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