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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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Group Policy Exemptions using filters

I have set a policy to enforce screensaver with a lockout after 7 minutes prompting for password. I have found that there are a few machines as exemptions. I have made another policy to disable the screensaver for devices that are part of a…
JohnyV
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Virtual PC (machine), loopback adapter, LAN, SQL Server

I've setup my VM to mimic my DevServer. I've setup my Network Connections to read from my Loopback Adapter 1st, LAN 4th. But for some reason, when I create my connection string: "Provider=SQLOLEDB;Data Source=DevServer; Initial Catalog=myDB; User…
Robert
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Terminal Server and loopback address usage

Been trying to research this question to no avail yet!. Perhaps somebody can help. I am trying to identify if localhost on a TS works in the same way as a straight server. If I have an application being launched in every TS session listening on a…
Peter Lee
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how to force linux to accept packet with loopback ip

i have an embedded system with an Ethernet interface that needs to accept external packets with IP of 127.x.x.xx. is there a way to force Linux to accept external packets with this loop back address and to treat the packets as "normal" IP…
mark
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2 Webapps hosted on same server talking to each other - do they use eth1 or lo1?

I am trying to establish bandwidth needs for a set of webapps in the company. I am using SNMP to monitor the bandwidth on the eth1 interface, however I am trying to establish what is going over the pipe as far as all the intertwined webapps go. We…
Mitch Kent
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My lo interface is down on boot. What can I do?

My lo interface is down when the system boot. I can turn it up with ifconfig up lo but I wonder what could be the cause? Where can I look to debug such problem?
Phuong Nguyen
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Is it possible to limit output bandwidth between eth0 and lo?

I'm trying to limit the bandwidth between my eth0 output (nginx proxy) to my loopback inteface (apache) by filtering on destination port. Incoming Packet -> Eth0 -> 0.0.0.0:80 Nginx -> tc qdisc class/iptable mangle 2525port -> 127.0.0.1:2525…
Arka
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server listening on loopback IP

I have a barracuda load balancer and a VIP which in turn forwards to a cluster of servers. Each of these servers has the VIP added to the loopback interface as the load balancer is on direct server response. I've been using this method for almost a…
skrilled
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How can node.js bind to loopback IPs that don't exist?

Simple node server started like so: server.listen(8080, '127.0.0.10'); This ip address does not exist anywhere in ifconfig: sudo ifconfig | grep 127.0.0.10 # No matches I can connect to 127.0.0.10 and reach node, but not any other loopback…
chmac
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Binding a host address to localhost in Linux

How to bind the example.com address to the local box? I'm enhancing a website, which is written so that 'example.com' is hard coded as its host. How do I do a loop back in Firefox in response to a 'example.com' request?
Alex
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MSTP with looped port

I have a configuration with two switches connected via a single Ethernet port. A second port of the first switch is looped back (Tx connected to Rx). They have 10 MSTI configured on VLAN from 100 to 1000 with step 100. These VLAN are configured on…
sthor69
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is it possible to use ms loop back adapter to setup local vlan

Is it possible to use Microsoft Loop back adapter to set up Lan connection between two computer which is logically isolated from the main network? 1st computer: has a regular ip…
zman
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Windows 2008R2 dns loopback best practices, setup correctly but same error

Windows Server 2008, I have setup my newest dns servers dns but it's still giving me an error stating that I don't have a loopback! This server is 192.168.1.9 primary 192.168.1.10 seconday 192.168.1.20 and 127.0.0.1 In that order. This server is a…
Shelly
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Which one is better to query from - loopback-ip or interface-ip?

I have memcache server listing on 0.0.0.0:11211. I have to query the memcached server from the same box. Which one do you think is better: querying from 127.0.0.1:11211 or from interface-ip:11211. Please explain why also ?
pradeepchhetri
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Routing traffic externally instead of internal loop

I have one Ubuntu box with 2 network cards. I am running netperf on the computer to measure performance of networking equipment, ethernet coming out of eth0 into the switch then back out into the second card eth1. Currently when I run the test it…
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