In TCP/IP a loopback device is a virtual network interface implemented in software only and not connected to any hardware, but which is fully integrated into the computer system's internal network infrastructure. Any traffic that a computer program sends to the loopback interface is immediately ...

learn more… | top users | synonyms

67
votes
2answers
24k views

Why does my hostname appear with the address 127.0.1.1 rather than 127.0.0.1 in /etc/hosts?

This may be a bit of a noobish question, but I was taking a look at /etc/hosts on my new Xubuntu install and saw this: 127.0.0.1 localhost 127.0.1.1 myhostname On most 'nixes I've used, the second ...
3
votes
2answers
7k views

iptables redirect local connections to remote system / port

I am trying to use SSH to port forward windows machines local port 3389 to a redhat server on some arbitrary port (in the unprivileged region) I have protected behind a firewall, then forward the ...
8
votes
5answers
10k views

iptables rules to allow HTTP traffic to one domain only

I need to configure my machine as to allow HTTP traffic to/from serverfault.com only. All other websites, services ports are not accessible. I came up with these iptables rules: #drop everything ...
17
votes
7answers
3k views

How fast is 127.0.0.1?

I wonder it it is tied to my NIC at all or if the OS or driver intercepts and immediately returns data sent to the loopback address? Do the electrons actually travel to my NIC then the NIC returns ...
2
votes
1answer
405 views

No network loopback device after security update ubuntu 12.04

I've had Ubuntu 12.04 on a server for the last several months, with everything working fine. Last night I did an aptitude update && aptitude safe-upgrade to bring in all the latest security ...
0
votes
3answers
193 views

Avoid write on a mounted loopback device to be propagated

I have a device that mounts its root file system using NFS. On my NFS server I have a file representing the device's file system, namely target.ext2, which I mount on the appropriate /export ...
0
votes
2answers
2k views

Group Policy Exemptions using filters

I have set a policy to enforce screensaver with a lockout after 7 minutes prompting for password. I have found that there are a few machines as exemptions. I have made another policy to disable the ...
-2
votes
7answers
2k views

http://localhost not working [closed]

i am using xampp 1.7.1 PHP 5.2.9 pinged localhost on cmd and it showed Reply from ::1: time<1ms Reply from ::1: time<1ms Reply from ::1: time<1ms Reply from ::1: time<1ms hosts file ...