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  • What is the point of PPPoE?

    - by aaa90210
    I am trying to expand my knowledge of networking beyond the basics. I have started reading about PPP, and how it is used in DSL modems with PPPoE and PPPoA. My first impression of PPP was "well that seems pretty similar to Ethernet". They are both data link layer protocols. They both have fields to identify the encapsulated protocol (e.g. IP). They both have related protocols to assign IP addresses (DHCP and NCP). So my first question was "so what's the point of PPP, why not just use Ethernet?". The answer to that was fairly straightforward - Ethernet is not supported over a wide range of media like serial lines, and is a fairly specific technology to LAN's using CAT5 or similar. HOWEVER - then I was reading about PPPoE, and the obvious thought was "well if we are doing something over Ethernet, then Ethernet must be available and in use, so why not just use it?". In other words, PPPoE seems to be encapsulating one data-link layer protocol in another very similar protocol. Why do IP-inside-PPP-inside-Ethernet when we could just be doing IP-inside-Ethernet, and use DHCP rather than NCP to assign the IP address to the home router? Thanks

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  • How can I access the scanner functionality of my Samsung CLX 3175N over the network?

    - by Roger De Backer
    I have a Samsung CLX 3175N network capable color laser printer/scanner which was sold as being Linux compatible. Whereas the printer undeed works in the network. It has been impossible up to now to get the scanner working under Ubuntu (safe for using Windows XP running in Virtualbox on the Ubuntu client), but that is not my understanding of Linux compatibility. Is there anybody who knows a method to access a network Scanner in Ubuntu?

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  • Can two users both control a third machine simultaneously using Synergy?

    - by Reason
    I've been a Synergy user for some time now, as I use a PC on the left side of my Mac. My girlfriend and I both have our desks on each side of the other, and we'd like to know if it were possible for the both of us to control the PC in the middle, with our own separate mouse & keyboards. Here's a crude drawing of our setup (1) her pc (2) my pc (3) my mac Currently, 3 is running a synergy server, and 2 is running the client. But like I said, I'm wondering if there's a way for 1 & 3 to both control 2 with their own mouse and keyboard. I'd ~love~ to have it set up where we could go even farther, and have both of our mice & keyboards able to control all 3 computers at the same time, for moments when we need to click or press keys for each other. But that seems a little too much to ask! Any thoughts?

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  • Unable to access Windows 7 shared folder with Windows 98

    - by PabloG
    I'm unable to access a Windows 7 (Windows 7 Pro 64-bit) shared folder from an old Windows 98 box: I tried with: Turning on file and printer sharing Turning on public folder sharing Turning off password protected sharing Sharing the folder with read permissions to Everyone Lowering the encryption to 40-56 bits. The shared folder works fine using it from Windows XP, and even from Linux with CIFS / Samba, but when I try to use it from Win98 with: NET USE X: \\SERVER\SHARE an user / password dialog pops up. I entered the administrator's user / password from my Windows 7 box, but it doesn't work (incorrect password). The same Win98 machine works fine accessing a Windows XP shared folder, so it looks like a Windows 7 networking issue. Any ideas?

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  • Does Gigabit degrade all ports to 100 megabit if there is a 100 megabit device attached?

    - by hjoelr
    Our company is buying some HP Procurve managed gigabit switches to replace some of our core switches. However, we aren't able to upgrade all of our switches from 100Mb to Gigabit switches. I think I know the answer but I'm not exactly sure. If we plug those 100Mb switches (or even a 100Mb device) into those Gigabit switches, will the performance of the entire switch drop to 100Mb or will just that one port work at 100Mb?

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  • How to throttle your own internet connection?

    - by darkAsPitch
    I am writing a website and want to test it's speed on slower internet connections. I have the unfortunate first world problem of downloading at 100mbps, how can I throttle my own computer's internet connection to 56kbps or 5mbps to give myself an idea of how my users might be downloading my website? EDIT: I am using Windows primarily but also have an ubuntu laptop if the answer is linux oriented.

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  • Problem with ping/DNS

    - by bublegumm
    When I am pinging non-existing host like 'zzz' or 'qwerty' I am getting the following result Pinging zzz.kanisa.com [209.62.20.200] with 32 bytes of data: Reply from 209.62.20.200: bytes=32 time=60ms TTL=46 Reply from 209.62.20.200: bytes=32 time=66ms TTL=46 It looks like a virus to me. But I was unable to find a solution on web. Any ideas how to fix it?

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  • Unlimited online backup space for fixed price using rsync/FTP/other simple protocol

    - by barrycarter
    Many companies offer unlimited online backup space for a fixed price (mozy.com, twitter.com/allmydata, onlinestoragesolution.com, etc), but they either use proprietary non-Linux-friendly software and/or have gone out of business and/or don't actually work. Who offers reliable unlimited online backup space for a fixed price that's compatible with rsync, FTP, or other generic/open source file transfer protocols? Or, has anyone written software that lets me treat Mozy's/etc space as though it were regular file space (eg, "mozyfs"?)

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  • RAID across SAS controller ports

    - by BlueGene
    Hi, I'm managing a HP DL360 G5 machine. It has a SAS controller with two ports. Port 1 is attached to 4 drive bays and Port 2 has 2 bays. The machine currently has 3 drives connected to Port 1 with RAID 5 configuration. I'm trying to max out the bays by adding 1 disk in port 1 and 2 in port 2. Can I group those three disks(1 disk-port, 2 disks-port 2) in a RAID 5 configuration?

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  • Throughput = BS * IOPS?

    - by Marvin
    I've seen in many places that throughput = bs * iops should be true. For example writing at 128k block size to a SAS disk that can support 190 IOPS should give a throughput of ~23 MBps - 23.75(MBs) = 128(BS)*190(SAS-15 IOPS)/1024. Now when I tested it in a VM against a monster NetApp filer I got theses results: # dd if=/dev/zero of=/tmp/dd.out bs=4k count=2097152 8589934592 bytes (8.6 GB) copied, 61.5996 seconds, 139 MB/s To view the IO rate of the VM I used iostat and esxtop, and they both showed around 250 IOPS. So to my understanding the throughput was supposed to be ~1000k: 1000(KBs) = 4(BS)*250(IOPS). dd of 8GB is twice the size of RAM of course, so no page caching here. What am I missing? Thanks!

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  • Test server on a local network with XAMPP

    - by hopscotch1978
    Hi, I'm not very proficient with networks and could use some help. I've got a Win 7 desktop with XAMPP which acts as my local dev machine. I've configured a virtual host on the desktop which I'm able to access fine. If I'm understanding things correctly, the virtual host uses port 80 (<VirtualHost 127.0.0.1:80>). I've just tried to configure a separate Win XP laptop on the local wireless network to connect to the main desktop for testing purposes. I've added the IP address and virtual host name to my Hosts file on the laptop. My virtual host is imaginatively named "virtualhost1". When I type this into my laptop browser, it connects correctly to the main desktop and I get the XAMPP welcome screen. But I can't seem to get to the actual site, just the XAMPP welcome screen. It kind of jumps the browser to http://virtualhost1/xampp/. I think it's a port issue of some sort but I have no idea how to resolve it. I would get the same XAMPP welcome screen on my desktop if I omitted ":80" from the virtual host declaration. On my main desktop, typing "virtualhost1" to the browser address bar gives me the site correctly, not the XAMPP welcome screen. Help would be appreciated. Thank you.

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  • Can you set CIFS permisions from EMC Command Line?

    - by TJ.
    I am in the process of migrating file shares from my EMC NS-20 to my new VNXe 3100. I am using a RoboCopy script to move the files but am getting errors on some files and folders. I have Domain Admin privileges but when I go to view the security permissions on the folders it says I don't have permissions. I have tried taking ownership to get around the permissions issue but that fails too. So as a last resort can I set permissions on this folder from the EMC console or Web management console?

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  • Ubuntu + latest samba version, symlinks no longer work on share mounted in windows

    - by Roy Rico
    I just apt-getted (apt-got?) the latest software for my Ubuntu 9.10 linux box, and I noticed that samba was the included in the update. After the install, the symlinks in my home directory no longer work when mounted as a drive in my linux box. They worked literally seconds before I did the update. All my normal directories work just fine. Viewing the directory listing on the command line, all the files, dirs & links have the exact same permissions, yet this is the error I get: Location is not available L:\LinkDir is not accessible. Access is denied. I looked on the forums, and i saw this option for the smb.conf follow symlinks = yes wide symlinks = yes unix extensions = no I put those in, but they had no effect. Has anyone had this problem yet?

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  • Monitoring multiple sites on a single server using OpsView

    - by Kev
    We have several web servers. On each of these servers there can be ~250 web sites. I need to add a HTTP check for each site on each server. Each site has a reserved host header that we know can always be resolved in the format of: w10000.hostchecks.mycompany.com w10020.hostchecks.mycompany.com w11992.hostchecks.mycompany.com ..and so on.. What I want is for there to be a master ping check on the web server's main IP address and then separate HTTP checks for each of the sites on the server. If the master ping test fails then I want the HTTP tests to cease until the master ping check goes OK. I had a stab at this and tried do the following: Create a parent host that does a ping check on the server's main ip address (e.g. server is named WEB0001). For each of the sites that reside on WEB0001: Create a separate Host with a Primary Hostname of wXXXXX.hostchecks.mycompany.com Make WEB0001 the parent host Add a monitor (HTTP check to a special url that is mapped into each site using a virtual directory: H- $HOSTADDRESS$ -u /__hostcheck/IsAlive.aspx -w 5 -c 10 -p 80 However I find that if I down the parent server (WEB0001) the http checks seem to continue. Am I going about this completely the wrong way?

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  • Ubuntu Studio 9.10 wireless doesn't work [closed]

    - by eric
    I just bought a brand new laptop. At first I was using Windows 7 and decided to switch to Ubuntu Studio 9.10 on my Studio Dell. My ethernet card is a Netlink. I do not have any connection at all to the internet, only when I plug the wire to my computer. I've tried a lot of stuff; nothing works. Can you help me please?

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  • Please recommend a good wifi to ethernet device.

    - by Fantomas
    I need that because I am running a free version of iESX server and there is very little that I can configure in the OS itself. The server is sitting rather far from my router and I want to get rid of that cable. Now, I have seen a device which is allows to cut a cable with a transmitter and a receiver. Ideally I just want a receiver because my router is already transmitting stuff. If you have successfully used a wifi to ethernet adapter / bridge, then please recommend it here. Thank you.

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  • Windows 7 File shares randomly not accessible from OSx

    - by Zen_Silence
    Hello Everyone!, My setup is I have a windows 7 computer acting as a file server. All my computers can connect to it fine including my mac. The problem is that randomly the mac will get kicked off the file share (even when i am in the middle of using it) and will not be allowed to reconnect to it until i reboot the windows 7 machine. (Rebooting the mac doesn't help) Does anyone know what could be causing this to happen?

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  • samba share not on network after upgrading to Ubuntu 12.04LTS.

    - by Sylvain Huard
    I just upgraded an old Ubuntu box to 12.04LTS (machine named A-Ubuntu). This is an upgrade not a format re-install. All the accounts and config were preserved. The basic setup is a local network with 2 Ubuntu machines (let say A-Ubuntu, B-Ubuntu) and a MAC (C-MAC). Before the upgrade, all of them could see each other by their names not only the IP address. The local network has a D-Link Router where everybody is connected with RJ-45 wired etherenet (not wi-fi). Since the A-Ubuntu upgrade, we can't see this machine name on the Network and its name is not on machine list in the D-Link router anymore. We can see it's IP address only. I can't access A-Ubuntu from the other two by its name but I can ping it with its address (192.168.0.109). From A-Ubuntu, I can connect and see the shared samba folders on B-Ubuntu and C-MAC. But from B-Ubuntu and C-MAc, I can't connect to A-Ubuntu. Correct me if I'm wrong but this tells me that Samba should be fine and the real problem is that A-Ubuntu does not advertise its name on the Network so the D-Link does not have it in its table so nobody else finds it. After a lot of googling, I see that it is the job of avahi and mdns to do so. Those packages are running, I checked multiple config files for samba, avahi, mdns to see as if it is like the examples on the WEB and also similar to what I find on the working B-Ubuntu machine. This is the same. I did multiple service restart with samba, avahi, remove the firewall to make sure it does not block the hostname broadcast. I rebooted multiple time to make sure the update I was making were effective. Still, Can't see the A-Ubuntu name on the network. Any idea what it can be?, Where to look next?

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  • Can I mount a volume at /Users on OS X?

    - by bshacklett
    I'm considering purchasing a SSD for my Macbook Pro. Unfortunately, I can't afford a large one, so I'm thinking of moving the current hard drive to the optical bay. On a Linux system, I would mount the second drive at /home. Given that OS X is Unix, I'm thinking it should be possible to do the same thing. Has anyone done this before? Edit: I should mention I'm running Snow Leopard.

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  • DriveImage XML fails with a Windows Volume Shadow Service Error

    - by ssvarc
    I'm trying to image a SATA laptop hard drive, using DriveImageXML, that is attached to my computer via a USB adapter. I'm running Win7 Ultimate 64 bit. DriveXML is returning: Could not initialize Windows Volume Shadow Service (VSS). ERROR C:\Program Files (x86)\Runtime Software\Drivelmage XML\vss64.exe failed to start. ERROR TIMEOUT Make sure VSSVC.EXE is running in your task manager. Click Help for more information. VSSVC.EXE is running in Task Manager, as is VSS64.exe. Looking at the FAQ on the Runtime webpage this turned up: Please verify in Settings-Control Panel-Administrative Tools-Services that the following services are enabled: MS Software Shadow Copy Provider Volume Shadow Copy Also make sure you are able to stop and start these services. Possible reasons for VSS failures: For VSS to work, at least one volume in your computer must be NTFS. If you use only FAT drives, VSS will not function. The required NTFS volume does not need to be identical with the volume you want to image. You should make sure that VSSVC.EXE is running in your task manager. If the problems persist, registering "oleaut.dll" and "oleaut32.dll" using "regsvr32" might help. Both of those services are running and can be started and stopped without issue. Using "regsvr32" to register ""oleaut32.dll" returns successful, but "oleaut.dll" returns: The module "oleaut.dll" failed to load. Make sure the binary is stored at the specified path or debug it to check for problems with the binary or dependent .DLL files. The specified module could not be found. Some other information that might be relevant. Browsing to the drive is successful, but accessing certain folders returns an "access" error. Windows runs a permissions adder that adds the current user profile to the NFTS permissions. Could this be the cause of the issue? DriveImage XML is running as Administrator. Thoughts?

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  • Is there a way to do something like LVM over NFS?

    - by warren
    I realize that since NFS is not block-level, LVM can't be used directly. However: is there a way to combine multiple NFS exports (from, say, 3 servers) into one mount point on a different server? Specifically, I'd like to be able to do this on RHEL 4 (or 5, and re-export the combined mount to my RHEL 4 server). expansion The reason I pegged lvm is that I want a bunch of exported mounts (servera:/mnt/export, serverb:/mnt/export, serverc:/mnt/export, etc) to all mount at /mnt/space so that my /mnt/space on this server (serverx) as one large filesystem. Yes, I know that re-exporting is generally a Bad Thing™ but thought it might work, if there was a way to accomplish this on a newer release as opposed to an older one From reading the unionfs docs, it appears that I can't use it over a remote connection - have I misread it? More accurately, since Union FS merges the contents of multiple branches, but makes them appear as one, it doesn't seem to go in reverse: I'm trying to mount a bunch of NFS points in a merged fashion, then write to them - not caring where data goes, a la LVM .

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