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  • communication network applications in Ubuntu 12.04

    - by soporte.cs
    I have installed edubuntu on 2 computers that are networked. I installed an educational software to keep track of the teams (one student and one teacher) but the teacher software is not any student team, as I have indicated in the product support should be enabled for proper telnet performance but despite being able to telnet between computers not get it to work. I wonder which options should be active in ubuntu for this type of software to operate smoothly. Thank you.

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  • Trouble with printer canon lbp2900-Ubuntu 14.04

    - by user288922
    I use Ubuntu 14.04. I installed the printer Canon LBP2900 following the guide and did all steps and now the printer works. I added CCPD in Startup Application (with command: sudo /etc/init.d/ccpd start). But after I log out or restart my pc, the printer can't print until I have to open terminal and run sudo /etc/init.d/ccpd restart && sudo /etc/init.d/cups restart. Once more, after restarting my pc I’ve just only printed 1 job (of course it can't print), and I run sudo /etc/init.d/ccpd restart && sudo /etc/init.d/cups restart, the printer will work but it prints the same job three times.

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  • Issues with Verizon's "Network Extender" device talking on my home network.

    - by Logan
    I recently switched my phone service to Verizon from ATT, and I get somewhat spotty service in my house. I called them and they sent me a "network extender" device for free. Its a femtocell that connects to my home network. The directions that come with it are very dumbed down, basically just say to connect it to your router and put it near a window (so it can get a GPS signal, it has to make sure its within the correct area before operating). The problem I'm having is the network light on it stays red. The troubleshooting information that came with it tells me this means there is a bad network connection. Its connected through an ASUS router running DD-WRT. No other devices on my network have a problem with it, including a Western Digital WDLIVE device, mine and my wife's cell phones (via wifi), a Wii, and an Xbox. If I connect the device directly to my cable modem, the light goes blue (which means good) and it starts working. So this tells me that its definately a configuration issue with my router. Verizon basically washed their hands of me when I connected it to my cable modem, and told me that its a router issue and to try a different router. Because normal people just have extra routers laying around their houses... When I connect it to the router, I can watch the DHCP Clients list on the status page, and the MAC of the network extender quickly fills up the clients list, grabbing every available DHCP address. Its like it grabs an address, can't connect to the internet, releases it, grabs another, then another, then another. So in the DHCP server settings I assigned a static IP to its MAC. This made it quit doing what it was doing before, but its still not working. I found the ports I needed to open on verizon's website, and opened them in the port forwarding config on my router. This still didn't help. So, I tried setting the network extender device's IP as the DMZ IP on the router. This still did no good. I called Verizon back and got the tech to write up a report which he passed on to a "senior network tech" who I got a call back from a few hours ago. This guy told me that while an ASUS router isn't listed as a supported device, he's not really sure why its not working. He suggested restoring the firmware to stock ASUS firmware and trying again. I have a very hard time believing its DD-WRT doing this, since every other device is working just fine with it. But its also not the Network Extender, since it works just fine when connected directly to the modem. At this point I'm out of ideas, and the next step is to restore the stock firmware on my router, and then going to walmart and getting a linksys WRT-54G to try. Is there anything else I could try before going that drastic? Cliffs- -Network extender won't work behind router, works when connected directly to cable modem. -Extender goes nuts when allowed to pick its own DHCP address, I had to assign it a static IP. -Won't work when correct ports are forwarded to it -Won't work with a DMZ address.

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  • CUPS basic auth error through web interface

    - by Inaimathi
    I'm trying to configure CUPS to allow remote administration through the web interface. There's enough documentation out there that I can figure out what to change in my cupsd.conf (changing Listen localhost:631 to Port 631, and adding Allow @LOCAL to the /, /admin and /admin/conf sections). I'm now at the point where I can see the CUPS interface from another machine on the same network. The trouble is, when I try to Add Printer, I'm asked for a username and password, but my response is rejected even when I know I've gotten it right (I assume it's asking for the username and password of someone in the lpadmin group on the server machine; I've sshed in with credentials its rejecting, and the user I'm using has been added to the lpadmin group). If I disable auth outright, by changing DefaultAuthType Basic to DefaultAuthType None, I get an "Unauthorized" error instead of a password request when I try to Add Printer. What am I doing wrong? Is there a way of letting users from the local network to administer the print server through the CUPS web interface? EDIT: By request, my complete cupsd.conf (spoiler: minimally edited default config file that comes with the edition of CUPS from the Debian wheezy repos): LogLevel warn MaxLogSize 0 SystemGroup lpadmin Port 631 # Listen localhost:631 Listen /var/run/cups/cups.sock Browsing On BrowseOrder allow,deny BrowseAllow all BrowseLocalProtocols CUPS dnssd # DefaultAuthType Basic DefaultAuthType None WebInterface Yes <Location /> Order allow,deny Allow @LOCAL </Location> <Location /admin> Order allow,deny Allow @LOCAL </Location> <Location /admin/conf> AuthType Default Require user @SYSTEM Order allow,deny Allow @LOCAL </Location> # Set the default printer/job policies... <Policy default> # Job/subscription privacy... JobPrivateAccess default JobPrivateValues default SubscriptionPrivateAccess default SubscriptionPrivateValues default # Job-related operations must be done by the owner or an administrator... <Limit Create-Job Print-Job Print-URI Validate-Job> Order deny,allow </Limit> <Limit Send-Document Send-URI Hold-Job Release-Job Restart-Job Purge-Jobs Set-Job-Attributes Create-Job-Subscription Renew-Subscription Cancel-Subscription Get-Notifications Reprocess-Job Cancel-Current-Job Suspend-Current-Job Resume-Job Cancel-My-Jobs Close-Job CUPS-Move-Job CUPS-Get-Document> Require user @OWNER @SYSTEM Order deny,allow </Limit> # All administration operations require an administrator to authenticate... <Limit CUPS-Add-Modify-Printer CUPS-Delete-Printer CUPS-Add-Modify-Class CUPS-Delete-Class CUPS-Set-Default CUPS-Get-Devices> AuthType Default Require user @SYSTEM Order deny,allow </Limit> # All printer operations require a printer operator to authenticate... <Limit Pause-Printer Resume-Printer Enable-Printer Disable-Printer Pause-Printer-After-Current-Job Hold-New-Jobs Release-Held-New-Jobs Deactivate-Printer Activate-Printer Restart-Printer Shutdown-Printer Startup-Printer Promote-Job Schedule-Job-After Cancel-Jobs CUPS-Accept-Jobs CUPS-Reject-Jobs> AuthType Default Require user @SYSTEM Order deny,allow </Limit> # Only the owner or an administrator can cancel or authenticate a job... <Limit Cancel-Job CUPS-Authenticate-Job> Require user @OWNER @SYSTEM Order deny,allow </Limit> <Limit All> Order deny,allow </Limit> </Policy> # Set the authenticated printer/job policies... <Policy authenticated> # Job/subscription privacy... JobPrivateAccess default JobPrivateValues default SubscriptionPrivateAccess default SubscriptionPrivateValues default # Job-related operations must be done by the owner or an administrator... <Limit Create-Job Print-Job Print-URI Validate-Job> AuthType Default Order deny,allow </Limit> <Limit Send-Document Send-URI Hold-Job Release-Job Restart-Job Purge-Jobs Set-Job-Attributes Create-Job-Subscription Renew-Subscription Cancel-Subscription Get-Notifications Reprocess-Job Cancel-Current-Job Suspend-Current-Job Resume-Job Cancel-My-Jobs Close-Job CUPS-Move-Job CUPS-Get-Document> AuthType Default Require user @OWNER @SYSTEM Order deny,allow </Limit> # All administration operations require an administrator to authenticate... <Limit CUPS-Add-Modify-Printer CUPS-Delete-Printer CUPS-Add-Modify-Class CUPS-Delete-Class CUPS-Set-Default> AuthType Default Require user @SYSTEM Order deny,allow </Limit> # All printer operations require a printer operator to authenticate... <Limit Pause-Printer Resume-Printer Enable-Printer Disable-Printer Pause-Printer-After-Current-Job Hold-New-Jobs Release-Held-New-Jobs Deactivate-Printer Activate-Printer Restart-Printer Shutdown-Printer Startup-Printer Promote-Job Schedule-Job-After Cancel-Jobs CUPS-Accept-Jobs CUPS-Reject-Jobs> AuthType Default Require user @SYSTEM Order deny,allow </Limit> # Only the owner or an administrator can cancel or authenticate a job... <Limit Cancel-Job CUPS-Authenticate-Job> AuthType Default Require user @OWNER @SYSTEM Order deny,allow </Limit> <Limit All> Order deny,allow </Limit> </Policy>

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  • Windows 7 Can't Connect to Network Drive on Windows XP

    - by Alex Yan
    I have a Windows XP desktop and a Windows 7 laptop both connected to a TrendNET TEW-432BRP router, which is connected to the Internet. They both have static IPs. The desktop has an external hard drive connected to it. The laptop is wireless and the desktop is wired. I enabled sharing on the external hard drive about two years ago when I bought it. I mapped it as a network drive on the laptop. I think it was yesterday, the laptop just stopped recognizing any of the computers on my network (When I open network, my laptop's the only one on it). I also get an error message "An error occurred while connecting A: to \CERTIFIED-DATA\Expansion Microsoft Windows Network: The network path was not found. The connection has not been restored" when I try to connect to the network drive. Both computers run Avast, and there hasn't been any problems with it. This has happened before but I never figured out why and how to fix it. It's usually fixed when I reinstall the OS of the affected system. Edit: I can't navigate the computer using \\CERTIFIED-DATA. I get a message saying "Windows cannot access \CERTIFIED-DATA. Check the spelling of the name, Otherwise, there might be a problem with your network" I clicked diagnose on the message and it failed to find anything wrong I clicked diagnose on my wireless connection, and it just keeps trying to check if something is wrong with the connection I can ping it successfully

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  • How does one extract the Canon ip4600 drivers in inf form?

    - by Trix
    I have a x64 machine which needs "additional drivers" for x86 clients. The problem I have is I cannot get the proper .inf files so I can use them. Canon only provides an .exe file, which when extracted has other .exe files and some dll files. I believe Canon changed their drivers, because I did have them extracted at one point, but sadly did not save them :(. The drivers are available here. Hopefully I am clear in what I am trying to do. Canon provides the .exe file. The .exe file when extracted does not produce any .inf driver files. Thanks!

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  • Different approaches to share files over local network

    - by exTyn
    I know, that I can use Google to find methods to share files over local network [1]. But, I have never shared files over local network, and I want to do this in a good, professional way. Also, this could be a good community wiki, I think. Well, what I am asking for, is: what are pros and cons of different methods to sharing files ofver local network? In my case, I need to share files between Linux & Win 7, and I want it to be secure (= without access for anyone else but me & people in my room). Another question (connected with above topic) is about playing music over the local network. Let's say, I live with 2 other guys in a room, one of us have speakers and we want to collaborate in creating playlists (e.g. everyone is choosing 3 songs to be played). Is it possible? How to do this? I am asking this question on SuperUser, because it (question) is connected with hardware & software (network, connecting computers, software for managing playlists in network etc.). I think it is most accurate place for such question (I have considered SO and SF). [1] And I have already done this! But, I do not have an experience in this field (sharing files over local network), do I am asking about pros and cons.

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  • Different approaches to share files over local network & playlists "collaboration"

    - by exTyn
    I know, that I can use Google to find methods to share files over local network [1]. But, I have never shared files over local network, and I want to do this in a good, professional way. Also, this could be a good community wiki, I think. Well, what I am asking for, is: what are pros and cons of different methods to sharing files ofver local network? In my case, I need to share files between Linux & Win 7, and I want it to be secure (= without access for anyone else but me & people in my room). Another question (connected with above topic) is about playing music over the local network. Let's say, I live with 2 other guys in a room, one of us have speakers and we want to collaborate in creating playlists (e.g. everyone is choosing 3 songs to be played). Is it possible? How to do this? I am asking this question on SuperUser, because it (question) is connected with hardware & software (network, connecting computers, software for managing playlists in network etc.). I think it is most accurate place for such question (I have considered SO and SF). [1] And I have already done this! But, I do not have an experience in this field (sharing files over local network), do I am asking about pros and cons.

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  • Private staff network within public network

    - by pianohacker
    I'm the sysadmin at a small public library. Since I got here a few years ago, I've been trying to set up the network in a secure and simple way. Security is a little tricky; the staff and patron networks need to be separated, for security reasons. Even if I further isolated the public wireless, I'd still rather not trust the security of our public computers. However, the two networks also need to communicate; even if I set up enough VMs so they didn't share any servers, they need to use the same two printers at the very least. Currently, I'm solving this with some jerry-rigged commodity equipment. The patron network, linked together by switches, has a Windows server connected to it for DNS and DHCP and a DSL modem for a gateway. Also on the patron network is the WAN side of a Linksys router. This router is the "top" of the staff network, and has the same Windows server connected on a different port, providing DNS and DHCP, and another, faster DSL modem (separate connections are very useful, especially as we heavily depend on some cloud-hosted software). tl;dr: We have a public network, and a NATed staff network within it. My question is; is this really the best way to do this? The right equipment would likely make my job easier, but anything with more than four ports and even rudimentary management quickly becomes a heavy hit on our budget. (My original question was about an ungodly frustrating DHCP routing issue, but I thought I'd ask whether my network was broken rather than asking about the DHCP problem and being told my network was broken.)

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  • how to prevent other computers from seeing our network computers through vpn

    - by Disco
    We have a local office domain consisting of Windows 7 and XP machines that is running on Windows Server 2008 R2. We also have users that connect via VPN into our network. My concern is that when a remote user opens up a folder, the Network section on the left side of the folder shows the remote user all the computer names in our local network. I would like to go about renaming our computers in the local network with more descriptive computer names, but I do not want the users off-site to be able to see these computer names by simply opening up a folder. (Granted, they can already do this, but our current naming scheme does not link computer names to users.) I would like to change our computer names so we can determine which computer belongs to which user more easily IF it can be done securely. How can I ensure that our local computer names are not showing up in the Network folder for remote, VPN-connected users? My online searches have turned up results where people are advised to turn off Network Sharing and Discovery, but that seems to only ensure that the local machine doesn't see other computer names. I want to prevent OUR computer names from showing up on OTHER computers, and I can't go into the VPN-connected computers and turn off THEIR Network Discovery settings. I would think there is a group policy that would control this but I have not found one yet and I don't know how I would apply it to VPN-connected computers. Thanks! EDIT: That's true, a Group Policy wouldn't run on users only connecting via VPN, good point. What about a VPN/router policy, then?

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  • Run command before and after printing with CUPS?

    - by leto
    Hello, this is a home setup. A central printer server (Linux) manages the queue, a HP 2430DTN is attached to it via 100Mbit/sec Ethernet. The printer is hooked up to a managable power source. A shell script watches the queue on the server (lpstat -o) and turn on the printer when there is a job. If the queue is empty for 10 minutes it turns the printer off. Now this setup messes up, stops the printer etc. after a couple of weeks and is in general "not so reliable". I now know how to change the stop-printer thing, but: Is there a way to run my turn printer on script and turn printer off script directly from cups without watching the queue? That would be so cool!

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  • Windows Server doesn't connect to a network share

    - by Dmitriy N. Laykom
    Windows Server doesn't connect to a network share. Network share is working. Blockquote Pinging 109.123.146.223 with 32 bytes of data: Reply from 109.123.146.223: bytes=32 time<1ms TTL=63 Reply from 109.123.146.223: bytes=32 time<1ms TTL=63 Reply from 109.123.146.223: bytes=32 time<1ms TTL=63 Ping statistics for 109.123.146.223: Packets: Sent = 3, Received = 3, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 0ms, Maximum = 0ms, Average = 0ms net view \shareaddress Blockquote System error 53 has occurred. The network path was not found. When I connected the network share I observed this error message: Blockquote \ "Mapped disk letter" refers to a location that is unavailable. It could be on a hard drive on this computer, or on a network. Check to make sure that the disk is properly inserted, or that you are connected to the Internet or your network, and then try again. If it still cannot be located, the information might have been moved to a different location The network share was mounted via Group Policy. Perchance anyone knows how I can avoid this error? When the OS has been restored from the disk problem has been solved

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  • Windows Server don't connect to network share

    - by user104775
    Windows Server don't connect to network share. Network share is work. Ping Blockquote Pinging 109.123.146.223 with 32 bytes of data: Reply from 109.123.146.223: bytes=32 time<1ms TTL=63 Reply from 109.123.146.223: bytes=32 time<1ms TTL=63 Reply from 109.123.146.223: bytes=32 time<1ms TTL=63 Ping statistics for 109.123.146.223: Packets: Sent = 3, Received = 3, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 0ms, Maximum = 0ms, Average = 0ms net view \shareaddress Blockquote System error 53 has occurred. The network path was not found. When network share was connected, I was got a error message: Blockquote \ "Mapped disk letter" refers to a location that is unavailable. It could be on a hard drive on this computer, or on a network. Check to make sure that the disk is properly inserted, or that you are connected to the Internet or your network, and then try again. If it still cannot be located, the information might have been moved to a different location Network share mounted via Group Policy. Any ideas?

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  • Network Scanning: HP Laserjet 2840 & Windows 7 (+ Linux?)

    - by Eddie Parker
    I own a HP Laserjet 2840 multifunction printer. It's a fabulous device, but on Windows 7 it can't network scan. HP doesn't seem to support it in anything greater than Vista, and they aren't forth coming with solutions. I'm curious if anyone else has gotten work arounds to this problem. One possible avenue for me is that I have an always-on Gentoo server that is configured to see the printer as a fax and printer using hplip. I have this shared via samba and I can print just fine through samba. Is there a similar way I can do network scanning? Anyone know of where I start looking for this?

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  • Custom built accounts package running on windows vista , printer selection box not now appearing

    - by liam hester
    This package has a printer function for documents which always brought up the printer selection box from which one picked the appropiate printer. Now recently,almost certainly as a result of windows updates, when I select PRINT nothing happens. The printer is working fine, and indeed a 'direct print' option to the default printer which is a matrix printer works fine, as it does not invoke the printer selection process. Does anyone know if there is a particular setting which might be causing this to happen. It works fine still on all previous windows versions XP etc, but will not work on Vista or later versions. Or is there a program code fix that anyone could suggest. Many thanks Liam

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  • Can't add printer on Windows XP

    - by SuperFurryToad
    I've added a HP 4250 printer to about half a dozen Windows XP PCs in our office without any problems whatsoever, but for some reason I haven't been able to add it to one particular PC today. I go through the Add Printer wizard to add a local printer attached to the PC, enter the new port number as a Standard TCP/IP Port, install the driver. At the end of the wizard I get the following error message: Full error message: "windows cannot connect to the printer. either the printer name was typed incorrectly, or the specified printer has lost its connection to the server." This doesn't make any sense as I am able to ping the printer from the PC. The print spooler is running, and any firewall software on the local PC is switched off.

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  • my realtime network receiving time differs a lot, anyone can help?

    - by sguox002
    I wrote a program using tcpip sockets to send commands to a device and receive the data from the device. The data size would be around 200kB to 600KB. The computer is directly connected to the device using a 100MB network. I found that the sending packets always arrive at the computer at 100MB/s speed (I have debugging information on the unit and I also verified this using some network monitoring software), but the receiving time differs a lot from 40ms to 250ms, even if the size is the same (I have a receiving buffer about 700K and the receiving window of 8092 bytes and changing the window size does not change anything). The phenomena differs also on different computers, but on the same computer the problem is very stable. For example, receiving 300k bytes on computer a would be 40ms, but it may cost 200ms on another computer. I have disabled firewall, antivirus, all other network protocol except the TCP/IP. Any experts on this can give me some hints?

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  • Ethernet: network topology

    - by aix
    Consider a standard GigE network switch. In order to do the switching, presumably it needs to maintain a map of MAC addresses of all things that exist on the network to its (switch's) port numbers. How does it maintain such a map? What are the protocols involved? If I change the topology of one part of the network, does the entire network get notified or do things get discovered "lazily" (i.e. on first need)?

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  • Security: Managing network shares remotely on Ubuntu?

    - by Industrial
    Hi everyone, I am about to setup a home network server running Ubuntu Server and I'm currently a bit worried about how to handle network shares and permissions in a good way. After working a bit lately with Netgears ReadyNAS's units, I have become really spoiled with how easy it was to set up network shares and giving a specific user different levels of network access to a specific share (forbidden access, read, read/write). How would I accomplish the same with my Ubuntu server through SSH? Thanks a lot

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  • Network Diagramming software options?

    - by Zak
    I've used The Dude to map my network, but I can only export the network map as a graphics file. I've also used Dia and Vision to manually diagram portions of my network. Does anyone out there have a solution where I can do automatic network mapping using a tool like "The Dude", then pull that file over to a manually editable format for cleaning up and/or enhancing in Visio or Dia?

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  • Security: Managing network shares remotely on Ubuntu?

    - by Industrial
    Hi everyone, I am about to setup a home network server running Ubuntu Server and I'm currently a bit worried about how to handle network shares and permissions in a good way. After working a bit lately with Netgears ReadyNAS's units, I have become really spoiled with how easy it was to set up network shares and giving a specific user different levels of network access to a specific share (forbidden access, read, read/write). How would I accomplish the same with my Ubuntu server through SSH? Thanks a lot

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