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• Linux / C++: Get Internet IP Address (not local computer's IP)

  - by Levo

  How can I programmatically get the Internet IP address? 1) If the computer is directly connected to the Internet using a USB modem. 2) If the computer is connected to the internet via another computer or a modem/router. I there a way to do both? P.S. This link gives exactly the Internet IP, but how can I use it in my program?

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• Ubuntu 12.04 share the internet over WiFi from wvdial?

  - by Sour Lemon

  I have just installed Ubuntu 12.04 on a separate partition on my hard drive so I can dual boot to either Windows 7 or Ubuntu. I am living in Japan and so I'm using a mobile broadband USB device called "Softbank C02LC". By default it seems that this device isn't recognised so I did the following: Terminal: sudo su nano /usr/bin/usbModemScript Nano: #!/bin/bash echo 1c9e 9900 > /sys/bus/usb-serial/drivers/option1/new_id Terminal: chmod +x /usr/bin/usbModemScript nano /etc/udev/rules.d/option.rules Nano: ATTRS{idVendor}=="1c9e", ATTRS{idProduct}=="9900", RUN+="/usr/bin/usbModemScript" ATTRS{idVendor}=="1c9e", ATTRS{idProduct}=="9900", RUN+="/sbin/modprobe option" which made the device visible from the network manager etc. However even though I set up my details correctly when I created a new connection (Correct username, APN etc) as soon as I try to connect it almost immediately disconnects. Because of this I then followed the instructions at this site: http://debugitos.main.jp/index.php?Ubuntu%2F%A5%E2%A5%D0%A5%A4%A5%EB%A5%A4%A5%F3%A5%BF%A1%BC%A5%CD%A5%C3%A5%C8 And I ended up using the c02lc_connect script at the bottom of the page to connect to the internet. The file contains the following bash script: #!/bin/sh usbinterfece=/dev/ttyUSB2 VID=1c9e PID=9900 WRONG_PID=f000 LSUSB=/usr/sbin/lsusb GREP=/bin/grep MODPROBE=/sbin/modprobe SWITCH=/usr/sbin/usb_modeswitch SWITCH_D=/etc/usb_modeswitch.d WVDIAL=/usr/bin/wvdial SLEEP=/bin/sleep SUDO=/usr/bin/sudo WHICH=/usr/bin/which switch_config="$SWITCH_D/$VID:$WRONG_PID" if ! [ -x $WVDIAL -a -x $SWITCH ]; then echo "Install wvdial and usb_modeswitch." exit 0 fi check_usb() { local vid="$1" local pid="$2" ($LSUSB | $GREP "$vid:$pid") } if ! (check_usb "$VID" "$PID"); then echo "Cannot find modem device..." if (check_usb "$VID" "$WRONG_PID") && ( [ -f "$switch_config" ] ); then echo "The device is attached but its mode is wrong." echo "Try usb_modeswitch..." $SUDO $SWITCH -c "$switch_config" $SLEEP 1 if (check_usb "$VID" "$PID"); then echo "Successfully switched the mode." else echo "Failed to switch the mode..." exit 1 fi else exit 1 fi fi if [ ! -c "$usbinterface" ]; then $SUDO $MODPROBE usbserial vendor=0x$VID product=0x$PID $SLEEP 2 fi $SUDO $WVDIAL which works completely fine - no problems what-so-ever. But we also have 1 more laptop here which I need to share the internet connection with. In Windows 7 I do this with the Connectify program, and in Ubuntu I have seen that you can do things like set up hotspots etc. But because I am using WvDial I am not sure how I would share the internet. I am only beginning to use Ubuntu but unfortunately until I can figure out how to share the internet over WiFi when connected via WvDial I have to stick with Windows. If you have any ideas on how to do this it would be much appreciated!

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• What does path finding in internet routing do and how is it different from A*?

  - by alan2here

  Note: If you don't understand this question then feel free to ask clarification in the comments instead of voting down, it might be that this question needs some more work at the moment. I've been directed here from the Stack Excange chat room Root Access because my question didn't fit on Super User. In many aspects path finding algorithms like A star are very similar to internet routing. For example: A node in an A* path finding system can search for a path though edges between other nodes. A router that's part of the internet can search for a route though cables between other routers. In the case of A*, open and closed lists are kept by the system as a whole, sepratly from any individual node as well as each node being able to temporarily store a state involving several numbers. Routers on the internet seem to have remarkable properties, as I understand it: They are very performant. New nodes can be added at any time that use a free address from a finite (not tree like) address space. It's real routing, like A*, there's never any doubling back for example. Similar IP addresses don't have to be geographically nearby. The network reacts quickly to changes to the networks shape, for example if a line is down. Routers share information and it takes time for new IP's to be registered everywhere, but presumably every router doesn't have to store a list of all the addresses each of it's directions leads most directly to. I'm looking for a basic, general, high level description of the algorithms workings from the point of view of an individual router. Does anyone have one? I presume public internet routers don't use A* as the overheads would be to large, and scale to poorly. I also presume there is a single method worldwide because it seems as if must involve a lot of transferring data to update and communicate a reasonable amount of state between neighboring routers. For example, perhaps the amount of data that needs to be stored in each router scales logarithmically with the number of routers that exist worldwide, the detail and reliability of the routing is reduced over increasing distances, there is increasing backtracking involved in parts of the network that are less geographically uniform or maybe each router really does perform an A* style search, temporarily maintaining open and closed lists when a packet arrives.

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• What would you do if there was no Internet? [closed]

  - by Jinjavajin

  If the International Network no longer functioned how would programmers cope? Would software development become an intractable problem? So much development has been achieved because of our interconnectivity that we might not be able to go forward as a community, without it. Is this the case, or might we become more productive due to the removal of a major distraction? How would we cope if the the network went down?

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• Start script on network connect

  - by Nate Mara

  I am trying to get a GNU/Linux Bash script to run as soon as a network connection is established on my Raspberry Pi. I tried following the instructions on several pages: I have tried adding my script to /etc/network/if-up.d and running sudo chmod ugo+x on the file. I have tried adding the line post-up <path/to/script.sh> to /etc/network/interfaces I am really quite clueless here. More info: The script runs fine when manually run, here it is: http://pastebin.com/UJvt5HYU (I did remove my personal info (email addresses, passwords), but other than that, the script is unchanged. This script also uses the sendEmail program (can be found at http://caspian.dotconf.net/menu/Software/SendEmail/).

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• Delayed startup of network icon (wi-fi)

  - by Michael Dy

  When my Windows 7 Starter netbook boots up and after everything is loaded, it takes about five minutes before the network icon near the clock becomes functional. When there's an available wi-fi signal (which automatically connects to my netbook as preconfigured) after the boot, my netbook seamlessly connects to it even if the network icon cannot be clicked or accessed. (The icon is shown to be loading for about five minutes.) During this time, when I go to Network and Sharing Center, it takes the same time to load. So even while the icon and the Center cannot be accessed, I can surf the Internet. When my netbook was still new, it didn't have this issue. How do I fix this?

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• Viewing CHM Files Across The Network in Windows 7

  - by Lukas Cenovsky

  When I try to open .chm help from a network shared drive I receive the following error: Navigation to the webpage was canceled. I know about the .reg solution described on KB896054 [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\HTMLHelp\1.x\ItssRestrictions] "MaxAllowedZone"=dword:00000001 but it does not work in Windows 7. Any ideas how to make .chm help available from the network drives? Edit: I have the network path mapped to P: drive letter. My program runs from P: and I want to see the help for it. Copying the program to local drive is not a solution for me.

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• network timeout how to analyse problem

  - by elhombre

  In the last three month I was experiencing that my internet connection started to get very slow and websites had long time to load. The first thing I made was an ping to www.google.com which showed that I was loosing pakets. Here some of the results: 64 bytes from 74.125.39.103: icmp_seq=2909 ttl=53 time=48.222 ms Request timeout for icmp_seq 2910 Request timeout for icmp_seq 2911 64 bytes from 74.125.39.103: icmp_seq=2912 ttl=53 time=44.372 ms Days later I had to reset my router because it wasn't able to establish a correct network connection. It was after the reset when things worked again for some days. But later the same network timeouts started to happen again. I would like to know how I can analyze the problem to get to the source which is causing this timeouts. Which steps do you take to circle in this Problem? My Network Laptop - Wireless Router modem - ISP EDIT: I am on a Mac OS X 10.6

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• Network bottleneck/throttling issue

  - by Gavin

  Hi all, It's my first day at a new company and i've been given the task to find out an issue with the internet connection. I noticed that whilst I was downloading a large file, the network grinds to a halt, except for my download. At first I thought it was the internet connection/modem but it seems that whilst the lockdown occurs, I am unable to access any network device. Has anyone experienced this before and if so, do you have any pointers? Looking at the setup. They have an DSL modem that connects to a 10/100 switch. There are only 5-6 computers on the network. Cheers Gavin

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• Auto-detect proxy settings on network

  - by Ali Lown

  I am having problems trying to run web browser software on the local network through the proxy. When running off the profile drive which is on a network share, the system is unable to auto-detect proxy settings. When running off the local C drive, the browsers are able to correctly autodetect the settings. The error from the browser is about it being unable to fetch the proxy configuration file. Is this some form of authentication preventing it retreiving the settings when running of the network location? PS. Would this be better off on superuser?

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• Using Zebra LP 2844-Z over the network

  - by Jason Kealey

  Hello, I am looking for a network-based label printer. I am looking at this Zebra LP-2844-Z printer. Unfortunately, it does not come with a network interface like the lower-end LP 2824 Plus. The ZebraNet 10/100 Print Server is both expensive for what it does (~$600) and only seems to support wireless networking, not wired. I prefer wired for reliability. Questions: Can I use a cheaper off-the-shelf print server to turn the LP-2844Z to a network printer. Would I get any trouble communicating with the printer via its own programming language or via OPOS? (instead of the Windows driver) Are cheaper print servers reliable? Would I be better to get another printer model that has it built in directly to avoid having issues due to the print server? What other printer would you recommend?

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• an unknown ip on network

  - by Ahmed safan

  In our office we have many PCs, all of them have static IP addresses. We had a problem with one server with ip 192.168.1.10 dropping off the network occasionally. I unplugged the network cable from the server and from pinged 192.168.1.10 from another host and there was a response. I searched all PCs to see if any has such ip but i didn't found a one. I changed the server ip to fix the problem, but I still find this rogue device using 192.168.1.10 on the network -- how can I figure out what it is? Could it be the ip of virtual machine on someone's PC?

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• Windows 7 loses access to network drives

  - by dubRun

  Ok this is an odd one, but is happening often enough its getting quite annoying. I recently installed Windows 7 on my work computer (about 2 months ago) and every so often I lose access to network shares on our work network. Its one server in particular - other shares are still working fine. I have a number of folders mapped as a drive, and all of the ones on a particular file server have lost access. If I try to access the machine directly (\fileserver\d$) it doesn't work either with this message: Windows cannot access \fileserver\d$. You do not have permission to access \fileserver\d$. Contact your network administrator to request access Once I reboot the computer, access is restored like it should be. The computers are all on a domain and my user has administrator level access to the server in question.

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• Creating a Network link between 2 buildings

  - by Adam

  Hey My company needs to create a network link between two buildings. Currently we have a cat5e network in one building and would like to connect some computers(about 15) in our second building to the main network in the first building. The distance between the two buildings is 30 metres. The 30 metres means going through a wall from the first building. Going through the car park and then through a wall into the other building. We can run any cables through speed ramps and so we do not need to dig up the road! Also the second building does not have an Internet connection and so we have to create some sort of cable link so that they can share our Internet connection. Ideas? Should we just run cat5e? Should we run fibre? Should we run coaxial?

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• Hide network shared folder contents from users view

  - by user1157977

  I have this folder which i need to share it out on the network to facilitate patching from another pc but yet i want to prevent users from viewing the contents of the folder, is there any solutions for this? if i hide the folder and share it out on the network, i realized that when the user do a //192.168.x.x/ from another pc , the folder contents will still be visible even if its hidden. What i wanted to achieve is that the user will be able to access folder thru the network but not able to see any files within the folder (meaning he shd see a empty folder). Is it possible???

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• Analyze a wireless network that constantly drops/has speed issues

  - by Eddie Parker

  Hello, I'm curious what the best tools are to use for analyzing problems with a WiFi network. Here's the scenario: I have a WiFi router (Belkin N+) that's setup in AP mode. I have three RT-N13U's that I've purchased to use as 'repeaters', but I've had so many problems when more than one of them is running (bad routes) that I've only got one active. Sometimes certain boxes on my network can't talk to others, and drops are quite frequent and quite aggravating. I'm running Mac, Windows, and Linux (Gentoo) boxes on this network, so any software, or steps I should take that work for any of those boxes should be sufficient. Apologies if this is answered somewhere else - I'll close it as a dupe if so.

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• Shared login in a computer network?

  - by Donald

  Hi, I need to understand how a network works: Several PCs running Windows XP One server The PCs are all network connected, as well as the server. Each computer share the logins. I need to understand what happens if I take off the server. Can I still login in each PC? Is the username:passwords on the server or in each computer? My final goal is to take off the server from the network and I need to know what is the server doing. What can he be doing? Thanks.

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• Persistent network share connection not working with runas

  - by binarycoder

  If I use runas /user:DOMAIN\user cmd.exe (using XP), previously mapped persistent network drives are considered unavailable. net use shows: Status Local Remote Network ------------------------------------------------------------------------------- Unavailable H: \\SERVER\SHARE Microsoft Windows Network dir H: fails with "The system cannot find the path specified.". The connection is easily revived with `NET USE H: \SERVER\SHARE': not asked for a password when I do this. What is going on? Can I make Windows safely revive this drive automatically when it is first accessed.

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• Windows printing: printer works locally, but over network it can't find driver

  - by JudahGabriel

  A friend has a Epson Stylus RX500 printer. She wants to share it between her WinXP desktop and her Win7 laptop. The printer is connected direct to her WinXP desktop, and she can print fine from there. But the Win7 laptop can't print -- it can see the shared printer on the network, but it can't find a driver for it. (And looking on the web, I don't see any Win7 drivers for it.) However, if I connect the printer directly to the Win7 laptop, it works, it can print. This suggests that there is a driver for it, but for some reason, it can't find a driver when connecting to the printer over the network. My question is: if a printer works when connected directly to the machine, should it still work over the local network?

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• Basic questions about network topologies

  - by laoshanlung

  I have just started learning about network topologies, but there are a lot of confusion about different types of network topologies i have learnt so far. First of all, BUS topology. If i have like 100 PCs in the same wire connected using BUS topology, and the network connection speed is 100Mbps, then each PC will have a connection of 1Mbps, right ? With the same scenario, if i connect those 100 PCs using STAR topology, then each PC will have a connection of 100Mbps ? Then with the TREE topology, i divide the system into 10 sub-system (10 tree branches) , each branch has 10 PCs, then i will have other 10 small "BUS-topology" networks each one will have a connection of 10Mbps and therefore each PC will also have 10Mbps ? And the last one is RING topology, 100 PCs, each PC will have 100Mbps connection ?

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• Why are network printers not available in the Add Printer Wizard...when run over a network?

  - by Kev

  From a Windows 2003 server machine I browsed the network to an XP client (\computername in Explorer) then double-clicked Printers and Faxes and then Add Printer. In the wizard, normally the second screen asks if you want to install a local printer or a network printer. Well, in this case, it seems to assume I want a local printer, because the second screen is what would normally be the third screen if you chose local printer and clicked Next. I want to install a network printer on a remote machine for its local users. Is this not possible? If not, why not?

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• Can't connect to YouTube from specific network

  - by Tyilo

  Using my current network, I am unable to connect to http://www.youtube.com/. It doesn't matter what browser I use or if I use a cli-command (wget, curl). Error in Google Chrome: Oops! Google Chrome could not connect to www.youtube.com Error using curl: curl: (7) couldn't connect to host If I use nslookup to get the IP-address of YouTube, I get 173.194.32.32. If I go to http://173.194.32.32/ in my browser it can connect, but as Google is probably checking the Host HTTP-header, it shows Google's frontpage instead. There is no blocked websites on the router and other devices on the network seems to work. My computer only has this problem on this specific network. I am using Mac OS X 10.8.2 on a MacBook (mid 2009).

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• Advise on a 240,000 sqft outdoor wireless network

  - by whlspacedude

  I would be very appreciative of some advice in the purchase of equipment to provide a wireless network that covers the entire area of an outdoor arena. The area is rectangular-ish in shape. 400ft wide and 600ft long. It has 6 light towers, 1 on each of the 400 foot ends and 2 on each of the 600 foot ends. I can mount on anything and spend as much money as needed. The needs of the network would be to provide access for, up to 15 wireless HD cameras with audio, and a public-wifi network. Can someone point me in the right direction as far as equipment and antennas ? I can provide any additional information that you may need.

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• Network connectivity issues with Windows Store

  - by Duy Tran

  I have my Windows 8 Pro build 9200 installed on my Dell laptop. I want to install some new apps and updates from the Store but there might be some network problem that caused the downloading gauge showing up but not really running at all. I followed some instructions that switched from local user to my Microsoft account, but this "Please wait" screen keeps showing and I don't really know why. I still have internet access and can use some apps like People, Mail, etc. with my account logged in, I can surf the net using Firefox, Chrome and Internet Explorer. I did another test using cmd with ping -t google.com and it showed that my laptop has internet access. Anybody knows a solution to make the Store working properly? Or is there any workaround to switch to the Microsoft account instead of a local user account?

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• Dropbox style folder for network drives

  - by Toby Allen

  Does anyone know of a third party (or even windows native) solution to this simple problem. I want to map an internal network share on our windows server to a folder on each of the client machines in the network. I dont want to have to use Drive Letters I would just like to set up a Folder on my C drive that is actually a windows share eg C:\DATA\Network Docs is actuallyp pointing to \\Server\SharedData\ Is this possible? Is there a third party solution that does it? All clients are Windows XP and Windows 7.

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