Ubuntu Networking :: Nat Loopback - Get The Sever Viewable To Everyone Outside Of My Network ?
Sep 1, 2011
So I have an Ubuntu server setup but my modem from my ISP only has one ethernet port so I have to run my server behind a router. I have been able to get the sever viewable to everyone outside of my network but when someone is inside my network they have to view the server by the direct IP the web address doesnt work nor does the actual static IP. I believe this is something to do with my router not being able to loopback. It is a belkin N600 DB.
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May 6, 2010
I'm using Wordpress on Apache localy to keep a diary (it's convenient because of the tags).
When I'm connected to any network (be it wired or wireless) my Apache (and Wordpress, of course) works just fine. But as soon as I go offline, I can't access the web server neither through browser nor by telneting to the 80th port. Pinging localhost works just fine.Here is my ifconfig when offline and when online:Online:
Code:
eth0 Link encap:Ethernet HWaddr 00:24:54:6f:07:aa
UP BROADCAST MULTICAST MTU:1500 Metric:1
[code]...
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Jul 22, 2011
I'm running Ubuntu 11.04 and I've been unable to access any type of Internet service besides web browsing. When I check on Network Tools, it's always set on Loopback Interface, regardless of whether I've just switched it to Ethernet Interface. I haven't been able to download system updates through Update Manager. I'm not very experienced with Ubuntu.
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Feb 14, 2011
I want to use thin client with ubuntu but i don't where to start
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Jul 21, 2010
I want to install ubuntu server on an old pc and use it in my home office. However, I'll have to borrow a monitor to do the instillation... when I'm done I'll have to return it. Is there a way to monitor/manage the sever by using my web browser, free of cost?
Also seeing that I'm not so savvy with commands should I install the desktop interface?
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Apr 20, 2010
I own an Ubuntu Server 9.04 on a remote dedicated server. Since a few days (?) the loopback interface is not 'up' on reboot : I only have eth0 (which works fine).Here is my /etc/networking/interfaces (did not change since server initialization):
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
[code]....
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Aug 22, 2010
I run a webserver Apache2, php5, and MySQL. They are all set up correctly and I can access my website at [URL] I have, also installed, noip2 to update my IP address to no-ip.com for my domain name. Here's the problem: I can access my website through that domain name on other computers, both on internet and on the same network. But I cannot access it from my own computer (using the domain name instead of localhost). I need to be able to access the domain name on my computer because some pages on my website have been defined as the address to my domain name and not localhost. I cannot change this to localhost because if I do then people outside cannot work the webpages correctly. I had the same troubles on Windows before and I simply enabled loopback connections by typing in my private IP address along with the domain name into the Windows hosts file. I use version 10.04.
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Mar 24, 2010
I'm setting up a loopback server for work related testing. I have a small program that needs to be executed through telnet from about 200 IP's on the same network. On the server, I have to set a static ip, enable telnet login, and place my 2 program files in the appropriate folders so it will run. I have been on this for 2-3 days and haven't got far.
My /etc/Network/interfaces file is this...
Auto lo
iface lo inet loopback
The rest of terminal is filled up with these, and it states that the file only has 32 characters. I don't know if this is a privilege issue or not. I've read several threads on telnet, and lots of arguments about ssh, but I can't run ssh, so I need to enable telnet. There is not a security issue. I run a private network where the only valuable resource would probably be the text file with my IP address on it. Its also accessed by people that have very limited networking knowledge and no linux knowledge...
So,
Set static IP
Setup telnet server...
Any takers?
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Oct 12, 2010
Why does the loopback interface has such a high mtu? I get it that it needs to work out even large packets, which is logical but why this specific number? I can set the MTU even higher with the ip link command, so it's not a limitation of the variable used.
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Nov 22, 2010
The concepts of pseudodevice and loopback device ?
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Jan 13, 2010
I have two ethernet card on my computer, I want to make a TCP or UDP communication between these two cards, so I disable loopback: #ifconfig lo down. but with out loopback I can't even ping an eth from another one. how should I do? I want traffic to really pass eth cards.
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Feb 15, 2011
I have a server application that uses loopback addresses to open servers on linux machine.
For IPv4 with one line of configuration I can open many servers according to the mask I use for example with 10.10.10.0/24 I can open 254 servers.
How can I do the same for IPv6 ? I am able to add loopback interfaces but only for one host. Is it possible to add for a subnet ?
If not what is the max number of addresses that I can add ?
I also saw that it add the address only to loopback lo and I can add it to lo:3 for example.
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Feb 7, 2010
I added the following lines to my /etc/rc.local file:
Code:
ifconfig lo:0 10.10.10.1 netmask 255.255.255.0
ifconfig lo:1 10.10.10.2 netmask 255.255.255.0
[code]....
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Jun 8, 2010
I'm running a Source Dedicated Server on my Ubuntu laptop, and to connect to it via external IP from other computers in the network I need to enable loopback in my router.This was working fine, but then I disconnected my laptop for a few days, and when I came back the wireless stopped working on my Xbox. I reset the router to factory defaults, and then setup everything again. It was all working fine until I enabled loopback again and power cycled my router. Now every time I do that, the internet on Ubuntu stops working and the wireless on the Xbox stops working.
Edit: You can ignore this I guess. It seems I was actually DISABLING loopback by enabling that router option, which I guess caused this. Strange, because the first time enabling this option was the only way to get my external ip to work. Oh well, everything is fine now.
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Sep 25, 2009
I have opened/added the ports 1812 and 1813 (both tcp & udp) for radius server in the firewall.
when i use the command : telnet localhost 1812 , the connection says "refused", i get the following messages code...
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Oct 16, 2010
QUESTION: Where do I add "pppd nomagic" to stop analog modem loopback errors? (I am using Gnome PPP.)BACKGROUND INFO:I am using Ubuntu LTS 8.04 on a laptop and have an analog modem connected via USB serial cable. The 8.04 dialup and the analog modem work flawlessly.Modem disconnects when using Ubuntu LTS 10.04.1 Live USB:I am testing LTS 10.04.1 on a live USB drive that I purchased preinstalled from On-Disk.On the live USB drive, I am able to get a dialup connection with my ISP long enough to pull up a web page with the browser. However, the analog modem disconnects within minutes with exit codes 16 or 17.an pppd:16 The link was terminated by the modem hanging up.The PPP negotiation failed because serial loopback was detected.
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Dec 14, 2010
I have a client's linux server where someone added a script which sends spam mails from the server's local loopback address (127.0.0.1) all my seniors worked on it and couldn't trace the script on the server this issue was going for a week, now I have an idea to bring down the loopback interface of that particular server(ya, that was not a permanent solution but just had an idea), but my support manager told that it will bring the whole server down(so far as i have learn't loopback address is used only for testing the NIC card's functionality), is that really bring the server down.?. How ever i tried this using a test machine all the connections works fine even after i bring down the loopback interface. As my client's server is a production server i can't test it there without clear knowledge, can any one help me out whether will it bring down the server or will it cause any side effects on it(i know that you guys are experts so i am asking it here)?
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Jun 22, 2010
I have a problem with my F13 and wired connections on my Acer TravelMate 2410. When I connect the inet cable it doesn't show it as connected. When I type ifconfig, it shows everything as it should. When I tried to bring up eth0 with ifup eth0, it said that the device is not managed by NetworkManager. I tried to restart nm with service network restart, but it gave this error:
Shutting down loopback interface: Error org.freedesktop.NetworkManagerSettings.InvalidConn ection: ifcfg file ;/etc/sysconfig/network-scripts/ifcfg-lo' unknown
The same error came up for eth0 and Wired_connection_1 (the connection I configured from NM )
When I typed nmcli dev list it gave me:
GENERAL.DEVICE: wlan0
GENERAL.TYPE: 802-11-wireless
GENERAL.DRIVER: ath5k
GENERAL.HWADDR: 00:14:A4:4D:B8:FC
GENERAL.STATE: disconnected
CAPABILITIES.CARRIER-DETECT: no
CAPABILITIES.SPEED: unknown
WIFI-PROPERTIES.WEP: yes
WIFI-PROPERTIES.WPA: yes
WIFI-PROPERTIES.WPA2: yes
WIFI-PROPERTIES.TKIP: yes
WIFI-PROPERTIES.CCMP: yes
GENERAL.DEVICE: eth0
GENERAL.TYPE: 802-3-ethernet
GENERAL.DRIVER: 8139too
GENERAL.HWADDR: 00:0a:E4:EB:32:E2
GENERAL.STATE: unavailable
CAPABILITIES.CARRIER-DETECT: yes
CAPABILITIES.SPEED: 10 Mb/s
WIRED-PROPERTIES.CARRIER: off
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Jan 12, 2010
New CentOS 5.4 system working fine. Sys admins came in and copied the hosts file from one of the servers down to my desktop and ever sincethen machine has been slow (progs take 10-20seconds to load). RunningGnome. Luckily I saved the old hosts file and copied it back and all is now well. But I'd like to understand why, particularly as I will need to change myhostname in the future.
As configured:
/etc/hosts (yes my hostname is "dummyName" that I will need to change later)
127.0.0.1 dummyName localhost.localdomain localhost
[code]....
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Mar 26, 2009
I have been searching the forums for quite a while, to add extra Loopback adapter in Centos 5.1, but no success! Could you please suggest me the steps? in Windows, it is quite easy to add as many adapters as you want. wondering, if this is even possible in Linux? I have to run GNS3/Dynamips for router emulation and bind those Loopback adapters to virtual routers!
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Jan 28, 2010
I have it set up so when I go to URL... it shows my server. I'm not sure how I can make it viewable to everyone though.
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May 4, 2011
Background: I have a Desktop running Windows 7 Professional that has a Brother HL-2140 laserjet printer attached to it. I can successfully view the Windows 7 shares using SAMBA, but when I choose NETWORK PRINTER > WINDOWS PRINTER via SAMBA > BROWSE, I receive an error "NO PRINT SHARES - There were no print shares found. Please check that the Samba service is marked as trusted in your firewall configuration."
I have no firewall installed, the Windows printer is shared, and before I upgraded to Natty, all worked fine under Ubuntu Maverick. When I run the "testparm" command, I noticed that the line under [printers] states "browseable = No" even though in my smb.conf file it is set to "browseable = yes" (and I have changed/saved this file several times, using "sudo" with the same result).
I would like someone to look over my enclosed settings and see if there is a tweak I need to make in order to browse my Windows 7 shared printer.
[Code]...
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Oct 10, 2010
I have a Sparc Ultra10, which uses PC hardware. I see the Openboot console display at 1024x768, but when I try to boot from a Ubuntu server install CD for Sparc (for example, 7.04) the screen resolution immediately goes out of range for my monitor (according to a warning message flying around the screen).
I tried adding boot parameters to specify the resolution I want (boot: linux vga=773 screen=1024x76, but they seem to be ignored. I guess the Ubuntu testers all have Sun monitors!
I also tried the 8.04 and 9.10 versions, but they respectively hang after the "S" in Silo and issue the fatal error "Fast Data Access MMU Miss".
I've got Silo version 1.4.14, OBP 3.31.0, and POST 3.1.0. My computer is an UltraSparc IIi at 360 Mhz, with 256 megs of memory.
So, short of acquiring a monitor with the really strange Sun standard resolution, how can I get past this problem and get the resolution I want from Linux at boot time?
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Jan 18, 2011
I've set up an FTP and it works fine. Now the idea is to make it viewable from http://..... I've redirected the DNS to the specific IP, I've installed apache2 (using debian), I've configured the apache2.conf (as much as i know how ), but still nothing happens... The idea is, the files to be viewable/downloadable throught [URL], but the directory's in [URL] not to be seen (restricted)... The FTP directory is /ftp/username Tried this in apache2.conf
Code:
NameVirtualHost xxxx:80
<VirtualHost xxxx:80>
ServerName ftp.xxxx.org
ServerAlias ftp.xxxx.org
ServerPath /ftp/username
<Directory /ftp/username>
Options +Indexes
[Code].......
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Sep 2, 2010
I have to write lab reports with charts and graphs on a regular basis. i did the first one in open office recently but the charts did not appear on my teachers screen! it was a broken failed half rendered blank chart area!
The data tables copied fine but the graphs did not. i made both in spreadsheet and copy pasted them over to a writer document.
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May 4, 2011
My webcam works at my end but two people have said they can't see me their end using skype. They webcam with other people so i know it is not their settings or anything. One has a mac and the other a windows machine. I really don't have anyone else to test this with as most people i know don't have webcams.
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Apr 28, 2009
At the school i work in i have a server2k3 server that provides a domain to all the windows clients, aswell as a fedora server that acts as an imaging machine and webserver.
Im rather concious of the fact that if for any reason the Server2k3 server was to die there is no backup of active directory, or anything that can take its place whilst a replacement is found.
So is it possible to use a fedora machine with samba as a secondary domain controller? so it can be used as a login server, and has a copy of AD.
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Aug 27, 2010
how do i set up a ftp sever?
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Jan 3, 2011
i have a webserver in my local networkthat is myname1.myserver.comnow i want a second webserver runing in the same sever system.my projected name should bemyname2.myserver2.com
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Jan 13, 2011
I've recently decided to make a foray into the world of servers without any knowledge or experience. Yesterday, I ordered a Dell t110. I understand this is a really low-end server but I think it will work for home use. I am on a budget and literally just ordered the box. No keyboard. No mouse. No monitor. Not even an additional hard drive! With the exception of SLIGHTLY upgrading the processor, the thing is basically stock.
My question is this: Can I control and operate this server with my laptop somehow? Will that allow me to install Ubuntu Server as well as perform systems administration tasks? Ultimately, I'd like to get a new flat screen for the living room and have that be the monitor, with a wireless keyboard and mouse. However, like I said... I'm on a budget. I don't think I can sell my wife on that one right away. So... in the meantime, I need a way to actually USE my server.
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