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diff --git a/docs/testing/user/userguide/advanced.rst b/docs/testing/user/userguide/advanced.rst
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@@ -292,6 +292,7 @@ MAC Addresses
NFVbench will dicover the MAC addresses to use for generated frames using:
- either OpenStack discovery (find the MAC of an existing VM) in the case of PVP and PVVP service chains
- or using dynamic ARP discovery (find MAC from IP) in the case of external chains.
+- In case of L3 chain with SDN-GW or router between traffic generator and loop VM ARP is needed to discover SDN-GW mac addresses, use ``--loop-vm-arp`` flag or ``loop_vm_arp: true`` in config file.
Status and Cleanup of NFVbench Resources
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