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.
54
questions with no upvoted or accepted answers
5
votes
0
answers
2k
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 ...
3
votes
0
answers
2k
views
FFmpeg output sent to v4l2loopback video device won't be read by guvcview
I set a dummy camera /dev/video1 with v4l2loopback module.
I can read the stream with ffplay, vlc or even zoom of this camera when I send to it contentwith ffmpeg:
ffmpeg -re -i input-file.mp4 -f v4l2 ...
- 355
3
votes
0
answers
1k
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....
- 31
3
votes
0
answers
9k
views
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 ...
- 2,241
3
votes
0
answers
381
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 ...
- 131
3
votes
0
answers
1k
views
Loopback Address on OS-X
Wikipedia has this to say about the loopback address
Various IETF standards reserve the IPv4 address block 127/8 (from which 127.0.0.1 is most commonly used), the IPv6 address ::1, and the name ...
- 191
3
votes
1
answer
1k
views
Why does Firefox need a loopback connection?
I was playing around with firewalls and iptables. When I blocked any traffic except HTTP and DNS I was able to establish a connection to google.com via wget google.com. But I wasn't able to open ...
- 228
2
votes
1
answer
892
views
Cannot detach file-backed loop device after unmounting
I have some image files that I often use for cross-compilation work via chroot. My usual deal is to create a loop device with it, mount its main partition, bind mount /dev, /proc, /sys, and maybe /etc/...
- 407
2
votes
1
answer
2k
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 ...
2
votes
0
answers
664
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 ...
2
votes
1
answer
5k
views
How create loopback interfaces in Linux permanently
I aim to create 2 loopback interfaces and have them saved permanently in EC2 instance on AWS Linux Ubuntu based.
I did the following in /ect/network/interfaces
auto lo lo:1 lo:2
iface lo inet ...
1
vote
1
answer
3k
views
Need help to create a loop to copy and paste data in a certain way
I am struggling with a loop from past 3 days, finally requesting help from the community.
I want to each cell in column M from (input sheet) to output sheet in column BE multiple times based on the ...
- 11
1
vote
0
answers
185
views
What is the bottleneck of loopback?
Recently I am curious about that question, so I installed iperf3 on my macOS to benchmark my the performance of the loopback on my macOS. However, the CPU usages didn't reach 100%, which is expected ...
- 161
1
vote
0
answers
687
views
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 ...
- 11
1
vote
0
answers
236
views
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....
1
vote
0
answers
1k
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 ...
- 111
1
vote
0
answers
982
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 ...
- 317
1
vote
0
answers
2k
views
Block any connection in the Microsoft Loopback Adapter with Windows Firewall
What (inbound?) rule should one add in order to block any connection running inside the Microsoft Loopback Adapter?
Is that even possible? I heard that almost for the default loopback (127.0.0.1) any ...
- 209
1
vote
1
answer
3k
views
How to delete loopback adaptor in Windows 7 using batch script?
I have created 10 loopback adaptors on Windows 7 using devcon
devcon -r install %WINDIR%\Inf\Netloop.inf *MSLOOP
I put this in for loop and every thing is ok but now I want to delete them using ...
- 121
1
vote
1
answer
6k
views
How to change interface loopback adapter address in Windows?
Hi I created new loopback adapter in Windows 7 using:
devcon.exe install %windir%\inf\netloop.inf *msloop
Then if I execute ipconifg
Ethernet adapter Local Area Connection 4:
Connection-...
- 121
1
vote
2
answers
3k
views
Create Loopback and assign local addresses on Windows 8
I'm usually on OSX where I often add additional IP addresses to lo0 interface to simplify ssh tunnelling to various services on different machines to different local addresses:
# Tunnel mysql ...
- 111
1
vote
0
answers
380
views
Direct traffic from LAN interface into VPN
I have created a loopback network interface (by a software tool). Now I want to direct internet traffic through this interface. Note that I only can access internet via a VPN .
Now I do not know how I ...
- 221
1
vote
1
answer
225
views
trouble shooting the connection between systems by using telnet?
I have a windowsystem called "A" and Linux system called"B" .Our application software is client -server software. So in this scenario server part of application is resding in a window system and ...
- 213
0
votes
1
answer
30
views
Using all loopback IPs on OS X
I has service that binds random loopback IP on 127.0.0.0/8 subnet on demand (like 127.12.34.56).
It works fine on Linux but does not work on OS X.
Only solution I found was to make alias for each ...
- 1
0
votes
0
answers
53
views
VMware WKS guest/host bridged connection via loopback adapter
My guest on VMware workstation are bridged to host network and it works perfectly. guests see each other and able to communicate.
If I am not connected to my network it do not work because te host ...
0
votes
0
answers
61
views
Is this a cyberattack? Weird loopback file system in /tmp/tmp.050Scy377O/udf_ro
I noticed a strange-looking loopback file system being mounted on my linux machine, and dug into it a little bit. Does this look like some sort of hacking attack or cyberattack to any security experts ...
- 522
0
votes
0
answers
181
views
Virtual Camera Modus in OBS turn video into green / pink glitch (Ubuntu)
I want to use my Sony Alpha 6100 as a virtualcam via OBS on Ubuntu 22.04. OBS also finds my camera as input via gphoto2 and v4l2loopback-dkms. The image appears in OBS and looks good.
As soon as I ...
- 1
0
votes
0
answers
164
views
OS X Audio hiss/dropouts on recorded loopback audio
I've been trying to achieve a desktop audio recording loopback setup like this one https://www.youtube.com/watch?v=AGc42kDiND8.
So far, all of my attempts produced audio recordings containing hiss/...
- 13
0
votes
0
answers
79
views
iptables repeated entry, what is the logic behind it?
I bumped into these iptables entries for a specific scenario I needed to replicate!
iptables -F
iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -A INPUT -i lo -j ACCEPT
iptables -A INPUT -m ...
0
votes
0
answers
679
views
Excel VBA - Loop to Compare Cells, Offset entire row
Hopefully someone can help me with this!
Just started learning VBA.
I am trying the following code.
The aim is to compare cells in rows starting from row 4 to and offset entire row up or down based on ...
- 101
0
votes
1
answer
82
views
loopback api - persist AccessToken
First and foremost, my setup:
Ubuntu Server 18.04
Loopback API 3.X
Node version 12.6
My issue:
I set up Loopback API and created a few models and users. Now, all I need LoopbackAPI for is really ...
- 713
0
votes
1
answer
1k
views
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 ...
0
votes
0
answers
511
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.
...
- 820
0
votes
0
answers
232
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 ...
- 23.9k
0
votes
1
answer
2k
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 ...
- 11
0
votes
1
answer
756
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 ...
- 157
0
votes
0
answers
309
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 ...
- 103
0
votes
0
answers
279
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 ...
0
votes
1
answer
2k
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 ...
- 1
0
votes
0
answers
222
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 ...
- 1,566
0
votes
1
answer
777
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 ...
0
votes
0
answers
149
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 ...
- 3,872
0
votes
0
answers
3k
views
How can I add loopback adapters with the command line and configure them with the command line?
What is the command line to add a loopback adapter with IP 127.0.0.2 on Windows 8.1?
I need to add 65,000 ip's to my local machine for network stress tests (connections from many different IP's) for ...
- 1,959
0
votes
0
answers
1k
views
How can I create Local Loopback on Linux (RedHat or Debian)?
How can I do the same on Linux (RedHat or Debian)?
I need to create local loopback as shown herein: http://www.juniper.net/techpubs/en_US/junos14.1/topics/topic-map/ethernet-fast-and-gigabit-loopback-...
- 131
0
votes
0
answers
165
views
How to map only a part (byte- or block-based) of a device file or regular file to a loop device?
How can I create a loop device of an existing block device or regular file of size z so that a certain byte x (with x > 0) appears as first byte, x+1 as second, etc. and a certain byte y as last ...
- 2,282
0
votes
0
answers
739
views
IPSec Policy Is Blocking 127.0.0.1
I created an IPSec policy on Windows 8.1, it's purpose was to allow only traffic that goes via the VPN, everything else should be blocked (except LAN and 127.0.0.1). LAN is working fine, but 127.0.0.1 ...
- 202
0
votes
0
answers
233
views
How do I send data to the Microsoft Loopback Adapter?
I have a Microsoft Loopback Adapter installed and I have a program that listens to data on this adapter.
But how exactly do I send data to this loopback adapter in Windows? There must be some tool ...
- 153
0
votes
1
answer
106
views
losetup Find in Parallel / Concurrency
I'm writing a makefile that at some point builds image files. I'm using losetup -f in the file to find a free loop device when building out each image. Since the images are independent of each other,...
- 1,437
0
votes
0
answers
1k
views
loopback adapter lost ip address 127.0.0.1?
I noticed networking issues and discovered lo was not behaving properly: it did not have any ip address!
lo Link encap:Local Loopback
LOOPBACK MTU:16436 Metric:1
RX ...
- 3,765
0
votes
1
answer
814
views
Magento Localhost Installation - LAN Works - WAN Issues?
I’m new to home servers and Magento. Running Ubuntu Server 13.04 with LAMP and Magento Commerce 1.7.0.2 on a dedicated home server. I've already configured my server's static IP, router's firewall and ...
- 121