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Questions tagged [loopback]

In TCP/IP a loopback device is a virtual network interface implemented in software only and not connected to any hardware, but which is fully integrated into the computer system's internal network infrastructure. Any traffic that a computer program sends to the loopback interface is immediately received on the same interface.

In TCP/IP a loopback device is a virtual network interface implemented in software only and not connected to any hardware, but which is fully integrated into the computer system's internal network infrastructure. Any traffic that a computer program sends to the loopback interface is immediately received on the same interface.

A loopback interface has several uses. It may be used by network client software on a computer to communicate with server software on the same computer, namely on a computer running a web server, pointing a web browser to the URLs http://127.0.0.1/ or http://localhost/ will access that computer's own web site. This works without any actual network connection–so it is useful for testing services without exposing them to security risks from remote network access. Likewise, pinging the loopback interface is a basic test of the functionality of the IP stack in the operating system.

Source: wikipedia

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Is a loopback interface just another term for virtual interface?

I've been reading through many forums and many questions here on loopback interfaces and a point that is constantly iterated is that a loopback interface is a virtual interface. In hypervisors like vmware and hyper-v, there is a virtual switch. Does…
rsn
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Can't track applications network communication under same machine

I have a network application environment of 7 applications communicating with eachother through UDP and TCP. All of them using either the machine's local network IP or 127.0.0.1 (localhost) to listen on ports or connecting to eachother. All these…
underthevoid
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Nat Loopback - Access external IP from internal

I have a static IP and I've made a webserver that is running fine from WAN (domain points to my IP). However, when I access my external IP/Domain from my LAN, it redirects me to my router login page. What can I do to fix this? I've read something…
Turbo
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Err-disable in Switch 2960

I have a problem. I have a Cisco 2960, this switch conect 23 Macs. The problem is that a pc puts the port in err-disable. When I put the command "show interfaces status err-disabled" the output is this: Port Name Status …
Joshua HG
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How to change loopback network mask or redirect subnet to another interface

I have the following problem. First of all. Here are my interfaces. # ip addr ip addr 1: lo: mtu 16436 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo …
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Is there a Universal/Generic Default Gateway Address in IPv4?

Is there a universal and/or generic default gateway address in IPv4? I'm looking for something similar to the way you can always reference a NICs IP address from itself with 127.0.0.1 regardless of any other factors, making deployments much simpler…
Giffyguy
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The file system /dev/loop0, has reached critical status because it is 100% full

The file system /dev/loop0, which is mounted at /tmp, has reached critical status because it is 100% full. The problem is when I checked the space of hard disk I found that: /dev/loop0 space:485M used:21M free:439M usage:5% /var/tmp So what is the…
SHREEF
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Forward packet from loopback interface based on routing table

I have a problem in which I need to process some packets and send out to more than one interface/network. My solution is to send the packet to a loopback/dummy interface and based on the Linux routing table packet shall be forwarded to corresponding…
Shihab Pullissery
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How to access server using public ip when in the network itself?

I've asked this question and even searched around but didn't get a useful answer for me. Basically what im doing is i have a webserver on internal ip 192.168.0.100 port 80. So if im in the network it would be accessible if i type in…
James
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http://localhost not working

i am using xampp 1.7.1 PHP 5.2.9 pinged localhost on cmd and it showed Reply from ::1: time<1ms Reply from ::1: time<1ms Reply from ::1: time<1ms Reply from ::1: time<1ms hosts file has 127.0.0.1 localhost 127.0.0.1 localhost.com 127.0.0.1…
kapitanluffy
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localhost loopback tcp connection in Windows: increase the bottleneck of 65535 bytes per segment

The scenario that I have is as such: I have a loopback TCP session and I want to improve its performance. I have my socket-like objects (System.Net.Sockets in .NET Framework, to be specific) sending messages of up to about 9MB each flowing in both…
yu quan
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Connectivity issues with 127.x.x.x series

Asked this in network-engineering in stack exchange and was redirected here. I have a couple of servers with the below config server1: eno1: 127.15.0.1/16 scope global eno2: 5.0.0.1/24 server2: lo: 127.0.0.1/16 (it had /8. I changed the subnet mask…
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