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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Can anyone explain how the loopback interface works? [duplicate]
I got to understand how TUN/TAP works from the following illustration:
TUN/TAP illustration
I'm at a loss how the loopback interface works. Can anyone explain a bit about how the loopback interface ...
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1answer
47 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 ...
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3answers
946 views
What's the difference between 127.0.0.1 and 127.0.0.0
I know that both are loopback IPs, but they have another ip mask.
What's the difference between them? Can they be used interchangeably?
...
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2answers
61 views
The opposite of mount -o loop: can I read a block device as a regular file?
I'm trying to back up an LVM volume using Duplicity (note: not just the file contents of the volume, but the actual volume itself, byte-for-byte).
The best way I've so far found is to dd all the data ...
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1answer
286 views
How do you create and partition a raw disk image?
I need to create a raw disk image for use in a virtual machine, but I need to create the partitions before creating the file system or installing the operating system.
Can anyone describe a process ...
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1answer
95 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 ...
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1answer
97 views
Why do DNS queries use loopback interface?
Sniffing (using Wireshark), for didactical purpose, my loopback interface on Ubuntu 12.04, I noticed that a lot of DNS queries (maybe ALL of them) have 127.0.0.1 as source and destination address.
...
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2answers
305 views
TCP/UDP hole punching from and to the same NAT network
I was wondering if tcp/udp hole punching would still work when you are in the same network (behind a NAT), and what the packet's path would be.
What happens when using hole punching on the same ...
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288 views
How to fake an internet connection using localhost [closed]
Last week I read an article which tells how to change the registy keys in Windows so your computer will not access a microsoft site to determine it's connected to the internet or not, but it will ...
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1answer
971 views
How do you get loopback addresses other than 127.0.0.1 to work on OS X
According to everything I read, the entire 127.x.x.x subnet should loopback.
However, on my Mac, I can only ping 127.0.0.1
I know I've done this before (though possibly on another OS) and has come ...
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0answers
11 views
supporting loopback [duplicate]
Possible Duplicate:
enabling loopback
Currently, I have a router/modem combo which does not support loopback. I run a webserver on the LAN, and when I'm on the LAN, I can only access it by ...
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3answers
595 views
enabling loopback NAT
I have a Qwest Aciontec Q1000 modem/router combo, which does not support loopback. I run a webserver on the LAN, and when I'm on the LAN, I can only access it by its local IP 192.168.0.201. When I'm ...
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1answer
204 views
Ubuntu NFS 4: How to avoid the clientaddr param being added?
I'm trying to mount distant NFS. This is what I have in /etc/fstab :
server.com:/mnt/hdd /mnt/hdd nfs rw,tcp 0 0
But this param gets added to the mount.nfs args:
clientaddr=192.168.x.x
Since ...
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1answer
2k views
Windows 7 - Why is the Network on my Loopback Adapter Showing as Unidentified and thus Public?
I'm running a virtual machine (Win XP, but OS doesn't really matter) on my Windows 7 PC using the loopback adapter to create a private network between my host computer and the virtual machine.
...
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1answer
121 views
How far a loopback packet sent from an application layer goes on TCP/P layers?
Assuming that I want to check if my ethernet card is working fine, if I send a ping from a cmd on Windows, how far the sent packet will go? I mean, the packet will fall down over all the TCP/IP layers ...
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1answer
1k views
How do I reach the host loopback 127.0.0.1 from a VMplayer
I am using VM Player 4.0.2 running Ubuntu 11.10 guest OS on WinXP host, with NAT network connection configuration.
I have an application running on Win XP that communicates with a device manager ...
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3answers
2k views
Linux - how to format multiple file systems within one file?
I need to create a disk image with two empty file systems. I have created it using
dd if=/dev/zero of=./disk.img bs=1MiB count=1024
Next, I have created 2 primary partitions using fdisk disk.img; ...
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1answer
337 views
How to route line in to speakers on debian with alsa?
How can I route line in to speakers, loopback-style with alsa? I've seen a few solutions using GUIs but I don't have a desktop UI installed. I've also seen a solution with PulseAudio, but I'd prefer ...
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1answer
508 views
Pinging localhost versus pinging 127.0.0.1
If I ping localhost, I receive a reply from ::1 which IIRC is the IPV6 loopback address.
If I ping 127.0.0.1, I receive a reply from 127.0.0.1 as expected.
Why is there a difference when hostname ...
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1answer
466 views
What protocols (and thus layers) are involved with pinging the loopback IP address?
RFC 3330 states,
127.0.0.0/8 - This block is assigned for use as the Internet host loopback address. A datagram sent by a higher level protocol to an address anywhere within this block should loop ...
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1answer
1k views
Why has Microsoft never implemented a loopback interface in Windows?
First things first: I know that you can install a sort-of-a Loopback Adapter in Windows.
But what I really found strange is that there exists nothing like lo on Windows. At all. From The missing ...
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1answer
746 views
loopback error, home network
I've setup my router to forward port 80 through to my computer, so I can access it from a dyndns.org domain. The domain and the ip both seem to be totally working, externally (can access it from ...
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1answer
449 views
Automation of Loopback Adapter install on Windows
I have a piece of Software that requires a Loopback Adapter on Windows.
Is there some sort of scripting or a batch file that could automate installing and setting up a Loopback Adapter with a certain ...
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2answers
2k views
Install Ubuntu 10.10 from loopback mounted ISO image
I have a laptop with a faulty BIOS that has stopped booting from CDs even though it supports it (and it doesn't support booting from USB drives).
I am trying to install Ubuntu 10.10 on it. I already ...
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2answers
670 views
How does WUBI handle partitions upon shutdown?
Alright, so, basically, I'm trying to boot up Gentoo in a manner similar to WUBI; I have an installation on an ext4-formatted loopback file, BURG installed under the Windows Bootloader, and the ...
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1answer
371 views
Distorted audio recordings with windows 7 & EMU 0404
Situation:
I wish to record "what i heard" while using the PC using either digital/analogue/software loopback.
My configuration
E-MU 0404 PCI sound card
Windows 7 Ultimate (x64)
Audacity / ...
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2answers
108 views
SSHing across VM's on Windows XP
I have 2 VM's, A and B, running Red Hat EL 4.5, on a host machine running Windows XP.
A's ip is 192.168.1.100
B's ip is 172.16.1.100
I have setup 2 virtual networks on Microsoft Loopback Adapter
...
1
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1answer
152 views
Loopback mountable encryption for an existing partition image
Is there a way to encrypt an existing filesystem in a file that is mountable via loopback?
I thought I had a simple plan for moving from an old notebook to a new one, but actually something does not ...
1
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1answer
3k views
Is localhost host resolved to 127.0.0.1? [duplicate]
Possible Duplicate:
Why is “127.0.0.1 localhost” needed in HOSTS file ?
Is localhost host resolved to 127.0.0.1?
If "yes", then why does everything (IIS , ASP.NET, MS SQL ...
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4answers
3k views
How to fake ip at localhost without LoopBack
How can i fake an ip on my own PC? for example if there were an ip address lets say 201.91.81.71, that Host is somewhere outside of my red and is hosting a webserver. How can set a website on my own ...
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2answers
383 views
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2answers
734 views
What does it mean whether network device is Loopback?
Does it mean that the Loopback device handles the request like ping localhost ?
If so, there should be at least one device that's loopback,but seems none of my two network device is Loopback:
...
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2answers
26k views
How can I change the binding order of network adapters in Windows 7?
The end goal here is that I am trying to install an Oracle 10g server on my Windows 7 x64 dev box. I use DHCP, and the Oracle installer is throwing up this warning:
Checking Network Configuration ...
6
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3answers
13k views
How do you Upgrade Ubuntu from an ISO Image By Mounting as Loopback (without burning)
I'm trying to upgrade 9.10 without burning the ISO image to a disk. What are the steps to get this to work?
I am using the Ubuntu-9.10-desktop-amd64.iso image.
There are a few postings around on ...
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1answer
6k views
Accessing a website via the webservers public IP from a PC within the same LAN
If two machines reside on the same LAN (a PC and a Webserver) why is it necessary to enable ‘NAT loopback’ on the router in order for the PC to access the website hosted on the webserver using the ...
47
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5answers
14k views
Why is localhost IP 127.0.0.1?
I wondered what is the origin of the decision to make localhost's IP address 127.0.0.1. What is the "meaning" of 127? what is the "meaning" of 0.0.1?
