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Questions tagged [loopback]

Loopback means the interface created and designated to test a local port or interface. It routes test messages from their source device back to the source without any processing or modification. For TCP/IP on an ethernet interface, the loopback IP address is usually 127.0.0.1.

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Restore clonezilla image to block device file

On an external hard drive, I keep a couple of clonezilla images I need about once a year. Once I need them, I just restore those images to the system drive. This has worked well so far. However, ...
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RouterOS Hairpin NAT not working

I am trying to achieve this. https://wiki.mikrotik.com/wiki/Hairpin_NAT WAP IP: static LAN IP: 192.168.1.1 Web Server: 192.168.1.88 I can get to the web server from outside without any problem ...
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Route internet through 'Windows loopback interface'

My PC has one Network adapter Properties of IP version 4 IP address: 185.x.x.111 Subnet mask: 255.255.255.0 Default gateway: 185.x.x.97 I want to add virtual adapter ('Windows loopback interface' ) ...
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Requests to all Localhost Ports through Browser return “connection blocked”

I wanted to open page on localhost that used to work before but this time browser showed only (as html <pre> tag's content) connection blocked Other Apache pages on other ports are not working ...
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I need to create a dummy network adapter with a specific.customizable MAC address

I am trying to put a band aid on a very flawed piece of software, and need to create a dummy network adapter in Windows that will have a MAC address matching one of my real network adapters. This ...
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132 views

Working around the Network Loopback Isolation of UWP Apps

I've been hitting a blockage trying to get my UWP App to receive data from a local UDP port in the following scenario: Windows 10 | Version 10.0.16299 Build 16299 UWP target and minimum Version 10.0....
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unexpected network loopback device on linux [duplicate]

executing ifconfig I found network loopback device which was not expected to show (maybe some linux packages created it on it's own?) but I would like to analyze it what it does - any ideas how to ...
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How to create a Loop in Shell Script to do a specific task?

I am trying to clean a Huge database of emails, but when I use the following Grep command, I get "Memory Exhausted" Error. pv "Suppresion-List.txt" | grep -vf <(sed 's/^/^/; s/$/$/' EMAILS.txt) &...
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loop(repeat) script block until successful db(mysql) password

I have the following function function executeMySql() { while IFS= read -p "$prompt" -r -s -n 1 char do if [[ $char == $'\0' ]]; then break fi if [[ $char == $'\177' ]...
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381 views

Why is loopback on Windows 10x slower than loopback within a Linux VM?

I have been testing the speed of my windows machine's loopback adapter using iperf3 which has given the following results: However, when I run the exact same test within a linux virtual machine ...
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482 views

Enabling NAT loopback on Zyxel C3000Z Modem/Router?

I have a C3000Z router from Century Link and it does not have NAT loopback enabled by default. The option is simply not available on the Web GUI. However browser around I found a few other models of ...
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1answer
691 views

Make localhost server exempt from UWP app network isolation?

By default, UWP apps cannot access network resources on the same machine. This restriction can be lifted per app using the CheckNetIsolation.exe utility. This is described in many places around the ...
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1answer
56 views

How to trick a Linux program into “seeing” just the loopback network interface lo0?

The title says it all. I am trying to avoid the situation when a program detects the IP of a network interface and sends it to a remote location. I am thinking to do this by tricking the program into ...
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182 views

Monitoring network traffic from Microsoft Loopback Adapter

I am getting my internet connection through a Microsoft Loopback Adapter (coming from a Virtualbox), and because of loopback implementation, you can't monitor its traffic via Perfmon or Task Manager. ...
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1answer
431 views

Speed of loopback interface

I am working now with nfs shares. And I want to connect to localhost with nfs. I have disk that can read/write ~400MB/s but when I connect to nfs on localhost I have only ~110MB/s. I read that ...
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87 views

Is it possible to connect to the same computer WITHOUT loopback?

I'm trying to measure the speed of the connection between my computer and my router. I'm using iperf for this, but the problem is that entering my own local IP address bypasses the network and ...
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Constant TCP requests and failed responses

I'm getting one of these per second: 457 205.494657 127.0.0.1 127.0.0.1 TCP 68 49507→23454 [SYN] Seq=0 Win=65535 Len=0 MSS=16344 WS=32 TSval=630136859 TSecr=0 SACK_PERM=1 458 205.494702 127.0....
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1answer
1k views

Do we need NIC to ping loopback IP

I read that pinging loopback will work if we have TCP/IP suite installed on our computers and don't necessarily have a NIC. So, do we need NIC to ping loopback ip(127.0.0.0) ? Thanks.
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454 views

What is a “loopback”, can it cause “damage”?

The high school I attend won't allow students to have the WiFi password. Our entire education system is evolving and becoming more and more dependent on the internet. Therefore, I brought my own ...
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1answer
2k views

NAT loopback on my router

Tried all for a day still can't get it done. I am trying to configure 'NAT loopback' on my router. Router LAN IP: 192.168.1.254 (br0) Router WAN IP: 192.168.10.129 Web-server LAN IP: 192.168.1.1 ...
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352 views

Loopback adapter breaks wifi

When I installed the loopback adapter on Windows 10, the wifi stopped working. Disabling the adapter makes the wifi go back to normal. The wifi adapter stays enabled, but just can't connect to the ...
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1answer
1k views

Differences between firebase, loopback and redux

I want to develop a web app and later corresponding android/ios apps. So far I have only decided the front end for which I want to use react and react native for mobile. For the rest of the ...
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1answer
6k views

How do you disable the loopback device windows 10?

I have found this question for Windows 7 many times (example), but this does not work on Windows 10, because I don't think the loopback network adapter is exposed in the same location. At least for ...
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1answer
433 views

Folder Redirection Not Working With Loopback Processing

I have an OU named TEST-OU where I want to apply Folder Redirection to all users in that OU. So far this has been working fine. Next I created a sub-OU below that one called TEST-SUBOU where I want ...
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Make “ping localhost” resolve to “127.0.0.1” instead of “::1” without the -4 option

Context We're wanting to use RawCap to inspect HTTP requests to localhost. RawCap though cannot capture IPv6. We've considered doing a massive find-replace of "localhost" with "127.0.0.1" in our ...
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1answer
1k views

iptables reject tcp-reset on loopback

I am trying to check how a software would behave if there is a network failure. That software is using tcp send() and recv() to communicate. Previously I was making the software communicate by ...
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2answers
12k views

How to add a second local loop_back address?

I already have a loopback address at 127.0.0.1, which corresponds to a host in the local loopback network 127.0.0.0. How could I create a second local loopback host with an address of 127.0.0.2 ?? ...
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816 views

Centos cURL connection refused on Its own IP

I have two services on one server (with different ports to access them). One of my services is trying to connect to the other one with the IP of server and its specific port. But I got some errors ...
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204 views

how to loopback a subdomain with same ip in windows 7

Ok i'm trying to loopback a subdomain of some webserver. There's 3 subdomains in the website. www, static and play. I pinged the static.website.com and i got this ip 123.123.3 (Example only). So i ...
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403 views

File-based loop device with writing support and dynamic size

Usually loop device (v-node disk) is based on a file with pre-allocated size (e.g. an image of a floppy drive or ISO disk). The device is then treated as a block device and can be formatted with any ...
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98 views

Is proxy traffic monitored by loopback device?

I understand loopback device acts like a mirror interface to my localhost. When I do ifconfig on my Ubuntu machine, I get this lo Link encap:Local Loopback inet addr:127.0.0.1 ...
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1answer
1k views

How to enable NAT Loopback when modem connects to router

I want to see my hosted pages using my public address from inside and outside my network, but so far I can only from outside. The thing is that I recently changed ISP, and they brought me a ZTE-F660. ...
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1answer
343 views

Website gets redirected to 127.0.0.1 occasionally

I am trying to access AirAsia's Web Check-in Page. Occasionally I can access it. However, most of the time I get redirected to 127.0.0.1. Could this be an ISP issue? Details: My hosts file is clean. ...
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1answer
450 views

Difference between 127.0.0.1 and 0.0.0.0 in the context of the Firefox address bar

I need to configure a firefox extension to load a page that can never exist. It should be as fast as possible. The obvious choice is about:blank, but the catch is that the API used by the extension ...
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3answers
2k views

Running DNS Server to circumvent NAT-Loopback issue

First I want to say that I probably read everything that there is on the internet regarding the problem. And the problem is that I can not access my owncloud over doc.selfhost.eu if I am in the same ...
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1answer
822 views

Is NAT loopback the only reason I can't view my own website from within my LAN?

I am new to this so apologies if this is the wrong place for such a question. I'm testing out a simple "hello world" website hosted at home. As we have not been assigned a static IP address by our ...
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3answers
4k views

Why is there more than one loopback IP address?

Most applications only need the one loopback IP address of 127.0.0.1. However, not only is the address block 127.0.0.1/32 provided, and even 127.0.0.0/24 is provided as well but in fact the whole ...
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1answer
10k views

How To Mount A Disk Image On Android With Terminal?

I'm trying to mount a disk image that I've made on my android with terminal and busybox. This is how I made the image: dd if=/dev/zero of=/sdcard/disk.img bs=4k count=131072 mkfs.vfat -v /sdcard/...
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1answer
754 views

Access 2nd network adapter from LAN

I am building a virtual network LAB using GNS3. It is installed in a virtual server (VMware) running Windows server 2012 Datacenter with 2 ethernet network adapters (Eth0 and Eth1), and 1 MS Loopback ...
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1answer
899 views

Mount FAT32 loopback as writeable

I'm trying to fix a corrupted FAT32 partition. The partition is working again, but I want to delete the remaining files containing wrong names and similar. I have a full dump of the SD-card in ...
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1answer
197 views

why 127.0.0.1 work even i did not install loopback adapter in win7

run ipconfig /all only display my real Ethernet network card, and check the windows device manager/network adapters, also did not find any loopback adapter. so how my 127.0.0.1 work? Microsoft do ...
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147 views

Why do I need a loopback adapter on the target hosts of a Virtual IP?

I recently ran into a problem involving virtual IPs for the first time. The virtual IP targets two different (as far as I can tell, physical) hosts. The hosts are linux, but I don't know what software ...
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3answers
598 views

Why does Linux accept traffic on unconfigured loopback addresses?

On at least two version of Linux (Ubuntu 9 and Debian 7) I've noticed that, even though I only have a single loopback address configured on lo (the standard 127.0.0.1 one), it happily accepts packets ...
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1answer
39 views

Does connecting to one's computer via local router automatically uses the loopback?

I have a TCP application that doesn't show up on Wireshark. I read it was because Wireshark is not able to sniff Loopback communication on Windows. So, instead of connecting to 127.0.0.1, I connected ...
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1answer
367 views

How to reroute external IP address to localhost?

I have a software that I no longer have access to it's source code that is connecting to a server on a certain IP. I want to be able to mimic the same server's functionality and route the IP address ...
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2answers
49k views

How can I use curl with ::1 for ipv6 based loopback?

I tried a few ways but they seem to be confusing curl. root@testt:~# curl localhost:8080 <h1>Hello world!</h1> <p>Boom Bam Splat</p> root@testt:~# curl ::1:8080 curl: (3) ...
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2answers
5k views

Is there any benefit in activating NAT loopback for basic video gaming? Does it help a PS4 use UPnP?

I have a router that I can turn on and off NAT loopback. The router is just used for game playing and phones and normal everyday Internet browsing. My question is this will there be any benefit to ...
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116 views

Loopback packet from FTTH modem for every 2 seconds

To investigate some network problem, I had installed WireShark. I could see "broadcast LOOP unknown function" packets are constantly coming. The packet is like this. FF FF FF FF FF FF (6 bytes, ...
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0answers
274 views

Force local packet pass trough the router (or disable loopback) - windows 8

i would like to avoid that packets sent from my machine to the same machine (via the IP assigned by the external router eg. 192.168.1.20) are routed with loopback and so never reach the external ...
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1answer
5k views

How to test whether a router supports NAT loopback?

I've been unable to find much information on whether my router (Linksys EA4500) supports NAT loopback, so I'd like to perform a test to tell me whether accessing my external ip address from within the ...