![]() NDIS loops packets back if all of the following three conditions are satisfied: The underlying miniport adapter media type is NdisMedium8023 or NdisMedium8025. If you are still unable to make this work after reviewing the above material (and similar articles around the web), we recommend engaging our Enterprise Support team by creating a support case. Protocol drivers and filter drivers can check this flag to determine if a packet is a loopback packet. In order to work around this situation, it is possible to use advanced routing and rules on the host side to guarantee that the Linux kernel will not accept traffic on a given interface if the destination IP is not defined on the incoming interface.Įxamples of this type of configuration can be found on the web, for example:īut our recommendation is to use 2 separate systems to perform network testing and throughput measurements, as this type of test case is more representative of real-world capabilities. It makes little sense to put a default route on the loopback interface, because the only place it can send packets to is the imaginary piece of wire that is looped from the output of the interface to the input. whatever you send to it is received on the interface. In Linux, when multiple interfaces on a node belong to the same subnet, it can lead to unexpected network behavior (as Linux hosts may respond to incoming packets via a different interface than the packet came in on). The only purpose of the loopback interface is to return the packets sent to it, i.e. This article describes which interface will count packet to/from loopback interface of a Junos router. Then, from the very definition of loopback interface, the packet should come back to linux kernel networking from the loopback interface itself. ![]() When a Junos router receives a packet destined to loopback IP address, the packet is counted on the interface toward the next-hop of the source IP address of the packet. With both ports connected in the same system, I assume you are assigning each interface an IP which is on the same subnet. From my understanding, when an IP packet is sent to an IP address on the 127.0.0.0/8 network the kernel sends the packet out on the loopback interface. To activate terminal loopback on the EFP: interface Po1 no ip address service instance 10 ethernet encapsulation dot1q 10 rewrite ingress tag pop 1 symmetric bridge-domain 10 ethernet loopback permit internal For Terminal Loopback Start Loopback Session. This article describes which interface will count packet to/from loopback interface of a Junos router. ![]() Welcome, and thank you for posting your inquiry to the NVIDIA Developer Forums! ![]()
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