Network loopback adapter12/11/2023 ![]() In the end, all of these virtual interfaces are created with software (and they basically modify/change the network packets that you send/receive - source IP, source MAC etc.) and they do in fact use the physical interfaces to communicate over a network. Bridge interfaces are virtual interfaces as well. Networking devices do have software installed on them, just like an operating system, and can create multiple types of virtual interfaces, among them being the loopback.īut there are other types of virtual interfaces, that have a different purpose (not for testing the network stack and sending traffic back or management), like the tunnel interfaces usually used for VPNs. It is also used by various routing protocols and other services. In networkingĪlso, (from ), you can see that the use for a loopback interface can actually be different in some cases, as in Networking (and networking devices as router/switches/firewalls, etc.) is mostly used as a management interface. So pinging/sending traffic to 'localhost' is actually done using a loopback interface. The IPv4 address block 127.0.0.0/8 is actually reserved for this reason and usually the 'localhost' points to an address from that range. If you have 2 applications running on the same system and you want to test if they can communicate with each other via the network, you won't need a router/switch (or whatever else would constitute the network), you just use software and a couple of commands to create some loopback interfaces and you route traffic through those. ![]() So from my point of view, the main purpose of the loopback interface(s) is to have an easy way to test the network stack of your system. Any traffic that a computer program sends to a loopback IP address is simply and immediately passed back up the network software stack as if it had been received from another device. It is implemented entirely within the operating system's networking software and passes no packets to any network interface controller. Implementations of the Internet protocol suite include a virtual network interface through which network applications can communicate when executing on the same machine. To go over the basic meaning and utility of the loopback interface (from ) I would still like to know if this is possible, and how to do it using TTCP? If you know the answer to this, please post it.I guess you are moving a little bit too fast and mixing the terms a little. I reviewed the help for IPERF and I think I got it now. It looks like it's trying to connect to itself? I have looked at ways to use TTCP to do the same thing and I have found the -a option, but when I tried to use it I received a Winsock Error on the client side. Can the -B option be used for both the server as well as the client side? What does the syntax look like for the client? UpdateĪs you can see by the answer I posted I have figured out how to do this using IPERF. I was unable to bind the client to the 10.1.1.2 address. ![]() Unfortunately I've been only able to use this option to bind the server to the 10.1.1.1 address. There is also the IPERF tool which has the -B option. How do I specify these addresses in TTCP? These are the IP addresses assigned manually to each network adapter. I want 10.1.1.1 to be the server (receiver) and 10.1.1.2 to be the client (transmitter). But why does it say 0.0.0.0? Is it passing through only one of the network adapters? Send Mode : Send Pattern Number of Buffers: 2048 On the transmitter end: C:\PCATTCP-0114>PCATTCP.exe -t 10.1.1.1 PCAUSA Test TCP Utility V2.01.01.14 (IPv4/IPv6) On the receiver end: C:\PCATTCP-0114>pcattcp -r ![]() They're giving me hard time because I'm using the same physical PC. I'm trying to do a simple loopback test between the two. They function as two separate network adapters. ![]()
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