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Environment/Versions STC version:- 5.35 ESXI - 6.7 Answer When you identify there are ARP failures when using STC virtual which is deployed on top of ESXI or QEMU Please enable below options. Step 1:- Enable start mac learning on all ports If the above solution does not work. Step 2:- enable Promiscous mode on ESXI host. Log into the ESXi/ESX host or vCenter Server using the vSphere Client. Select the ESXi/ESX host in the inventory. Click the Configuration tab. In the Hardware section, click Networking. Click Properties of the virtual switch for which you want to enable promiscuous mode. Select the virtual switch or portgroup you wish to modify and click Edit. Click the Security tab. From the Promiscuous Mode dropdown menu, click Accept.