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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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 ...
3
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1answer
113 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 ...
0
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15 views

vagrant VirtualBox - cannot connect HTTP from host while connected to a VPN (Watchguard)

I am revising my question completely. I cannot connect to my "public network" Virtualbox virtual machine via HTTP while I am connected to a Watchguard VPN. As soon as I turned off the VPN, I was able ...
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2answers
43 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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38 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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16 views

Virtualbox VM bridged NIC to host Loopback-NIC serve Internet

I have a Virtualbox VM with a NIC in bridge mode to the host machine Loopback Interface... I have in the VM the IP 192.168.0.12/24 I Have in the host machine 192.168.0.11/24 (assigned to Loopback ...
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24 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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31 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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12 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
218 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
42 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
73 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 ...
1
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3answers
319 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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0answers
26 views

Looping back network traffic on the same machine

I have some 3rd party software that expects UDP traffic to/from other machines on the same UDP port. I want two instances to run on the same machine and talk to each other. I'm running it in Windows7....
0
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1answer
123 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
492 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
2k 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/...
0
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1answer
246 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 ...
1
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1answer
88 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 ...
0
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1answer
42 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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0answers
31 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 ...
3
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3answers
227 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
25 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
194 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
9k 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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1answer
610 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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0answers
47 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, ...
2
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0answers
122 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
2k 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 ...
0
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0answers
595 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 ...
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2answers
218 views

IP Route Add Issue

I'm trying to set up IE browsing with fixed routes in the route table. Before adding the static route, I can browse http://www.whatsmyip.org/ with internet explorer After I add a fixed route e.g. ...
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0answers
291 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-...
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0answers
299 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 ...
0
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1answer
1k 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 ...
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1answer
881 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-...
0
votes
0answers
22 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 ...
0
votes
1answer
60 views

Kernel-level pass-through method to change file hashes

I'm searching for any kernel-level mechanism that is pass-through and will change file hashes by either encrypting file contents or appending data. The most obvious solution is encryption, but I can't ...
2
votes
2answers
1k views

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 ...
0
votes
2answers
447 views

Tshark is displaying “florence” and “eforward” rather than source/destination port numbers

I am running rawcap on windows7 loopback adapter. I have run telnet localhost 2181 15 Packets were generated. In order to view the output I ran wireshark\tshark -r \shared\pcap.pcap And here ...
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1answer
411 views

How to make two loopback adapters talk each other?

I have to test some java network application. Each client-app is identified by his IP. So the simpliest way to test it is to run some machines or VMs... But each instance of this application can be ...
0
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2answers
2k 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 ...
0
votes
0answers
245 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 ...
2
votes
0answers
185 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 ...
0
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1answer
91 views

How to make Linux read DOS partition table and create partition devices from loopback?

# blockdev --rereadpt /dev/loop3 BLKRRPART: Invalid argument How to make a "virtual HDD" in linux. It should be like loopback, but also with with automatic linux's detection of partitions and udev ...
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256 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 ...
0
votes
2answers
1k views

Cannot format local loopback filesystem

I'm trying to make a 40GB ext3 local loopback file system. This loopback filesystem is stored on my NAS which is mounted on a Ubuntu Precise 12.04 x64 machine using NFS. The machine has both read and ...
2
votes
1answer
740 views

Why TCPReplay show warning when packets replayed on loopback interface?

When I use following command to replay 1.pcap over lo: tcpreplay --mbps=10 --intf1=lo 1.pcap Then I see these warning: .Warning: Unsupported physical layer type 0x0304 on lo. Maybe it works, ...
0
votes
0answers
169 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 ...
0
votes
1answer
39 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,...
0
votes
0answers
614 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 ...