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.
Questions tagged [loopback]
132 questions
100
votes
6 answers
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?
Roee Adler
- 1,626
84
votes
3 answers
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 in very useful for developing multiple SSL sites…
elliotbetancourt
- 943
51
votes
2 answers
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
Hello world!
Boom Bam Splat
root@testt:~# curl ::1:8080 curl: (3) IPv6 numerical address used in URL without brackets root@testt:~# curl…
hak8or
- 742
39
votes
5 answers
How can I see 127.0.0.1 traffic on Windows using Wireshark?
Every time I try to filter to just show a specific IP address, I get an error indicating that it is "not an interface or a field." I have no idea what that means. Furthermore, I don’t really see any localhost traffic in the logs anyway.
How can I…
glutz
- 503
16
votes
3 answers
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 network loopback interface:
Windows TCP/IP stack does…
slhck
- 235,242
16
votes
3 answers
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 requirements ...
Check complete. The overall result…
Chris Farmer
- 956
13
votes
3 answers
Permanent loop device?
Are loop devices on Linux that are created with losetup supposed to be permanent? This does not seem to be the case for me. Whenever I restart my computer I see that the loop device is gone. I am using it to create loopback file drive.
How do I make…
yarun can
- 1,060
13
votes
3 answers
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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IPv4…
asdawrqtgf
- 377
11
votes
2 answers
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 to do this?
Aethylred
- 485
10
votes
3 answers
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 range 127.0.0.0/8 is provided. Clearly, this is a…
10
votes
4 answers
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; one is FAT32 and other is EXT3. Now, I have to…
psihodelia
- 935
10
votes
2 answers
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 kernel/initramfs available for booting. The booting…
Animus
- 101
- 3
8
votes
3 answers
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 this, but none of them work for 9.10.
cmcginty
- 3,431
8
votes
1 answer
Mounting as loop device fails with "wrong fs type, bad option, bad superblock, ..."
I tried
$ mount -o loop ./live-cd.iso /mnt
on a Live-OS image, which failed:
mount: /mnt: wrong fs type, bad option, bad superblock on /dev/loop0, missing codepage or helper program, or other error.
The image file is not corrupt.
Kapichu
- 261
6
votes
4 answers
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 on the LVM volume to a temporary file, include…
George
- 179