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  • How do I enable TUN/TAP forwarding?

    - by rafal
    I have a program which writes packets (destination address 10.3.0.2) to the TUN/TAP interface. Network: host1|tun0----eth1(10.3.0.1)|-------------------host2|eth1(10.3.0.2)| Wireshark captures these packets from interface tun0 but they are not forwarded to interface eth1. Commands: sysctl -w net.ipv4.ip_forward=1 sysctl -p iptables -A INPUT -i tun+ -j ACCEPT iptables -A FORWARD -i tun+ -j ACCEPT iptables -A INPUT -i tap+ -j ACCEPT iptables -A FORWARD -i tap+ -j ACCEPT /etc/init.d/networking restart /etc/init.d/openvpn restart

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  • How to tell credentials used for a Network Mapping?

    - by shanecourtrille
    I have a networking mapping that doesn't appear to work. When I connect to the mapping I get access denied when I try to create a folder. When I created the mapping I told it to login as another account. I have verified that account has the proper rights on the server side of things. How can I verify that my local machine is connecting with the right credentials?

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  • Layman's book for understanding computer networks

    - by srid
    The good thing about books targeting a layman is that it is usually very engaging to read (not dry and boring like, say, school/university books). Charles Petzold's Code: The Hidden Language of Computer Hardware and Software does this for explaining the underlying hardware in computers. Is there a similar book for understanding computer networking?

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  • Best way to provide redundant switching/links to server

    - by Myles Gray
    We have 3x ESX hosts and 2x SANS that we wish to move to a redundant 10G networking infrastructure. We have 4x Dell PowerConnect 8024F's to provide our backbone and are configured as so (only core switches relevant to this question): So the questions are: 1) Do the interconnects between the 4x 8024F's need to be LAG'd or just STP'd 2) As the NICs on the servers are split across 2 switches, does any special configuration need to be done here or on the switches? 3) If a link or switch fails will the switches automatically find a new path to the Server/SAN?

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  • Ubuntu 10.04 LTS consomme plus d'énergie que Windows 7, la distribution Linux est-elle trop gourmand

    Ubuntu 10.04 LTS consomme plus d'énergie que Windows 7, la distribution Linux est-elle trop gourmande ? Ubuntu 10.04 LTS est une distribution Linux mobile, optimisée pour les ordinateurs portables et les netbooks. C'est du moins ainsi qu'elle est présentée. Mais les tests réalisés par des journalistes américains démontrent plutôt le contaire. La consommation électrique de deux ordinateurs portables fonctionnant sous Windows 7 et l'Ubuntu 10.04 LTS a été mesurée et comparée. Il s'agissait d'un Asus Eee PC 1201N (Intel Atom 330 et solution graphique NVIDIA GeForce 9400M) et d'un Lenovo ThinkPad T61 (Intel Core 2 Duo T9300 et une carte graphique NVIDIA Quadro NVS 140M). Les tests ont été effectués avec le pilote graphique d'origine et...

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  • Fedora 13 étend la virtualisation Linux, la distribution s'appuie sur de nouvelles fonctionnalités K

    Mise à jour du 10.05.2010 par Katleen Fedora 13 étend la virtualisation Linux, la distribution s'appuie sur de nouvelles fonctionnalités KVMM Fedora, la distribution Linux de Red Hat, s'est portée très tôt sur la virtualisation. Dès sa version 4, sortie en 2005, ces technologies ont été incluses et améliorées au sein du produit. Fedora 13, a sortir ce mois-ci, continuera dans cette lignée. Paul Frields, chef de projet Fedora, explique ainsi que la distribution à toujours été "l'avant-garde de la virtualisation" en utilisant KVM "bien avant les autres". Car Fedora, en abandonnant Xen pour KVM, a fait un pas en avant niveau performances et stabilité. Fe...

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  • Canon MG6100 series USB printer receives job but doesn't physically print

    - by Old-linux-fan
    Printer MP6150 driver installed itself upon plugging in the printer. Printer is recognized (lsusb shows it) but does not mount. If the printer is recognized, the driver must be working (or?), but something is blocking the system from mounting the printer. Tried the usual things: power of printer, restart Ubuntu etc. Listed below result of lsusb and fstab: hans@kontor-linux:~$ lsusb Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 001 Device 004: ID 04a9:174a Canon, Inc. Bus 002 Device 002: ID 1058:1001 Western Digital Technologies, Inc. External Hard Disk [Elements] Bus 004 Device 002: ID 046d:c517 Logitech, Inc. LX710 Cordless Desktop Laser hans@kontor-linux:~$ sudo cat /etc/fstab [sudo] password for hans: # /etc/fstab: static file system information. # # Use 'blkid' to print the universally unique identifier for a # device; this may be used with UUID= as a more robust way to name devices # that works even if disks are added and removed. See fstab(5). # # <file system> <mount point> <type> <options> <dump> <pass> proc /proc proc nodev,noexec,nosuid 0 0 # / was on /dev/sda6 during installation UUID=eaf3b38d-1c81-4de9-98d4-3834d674ff6e / ext4 errors=remount-ro 0 1 # swap was on /dev/sda5 during installation UUID=93a667d3-6132-45b5-ad51-1f8a46c5b437 none swap sw 0 0

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  • What is wrong with Unix/linux

    - by John Smith
    This is a genuine question motivated by Ideal Operating System When I moved from DOS to Linux in the late 90s it was an eye opener for me. Long file names, arbitrarily many extensions etc... Now I look at Linux and Unix and see all sorts of issues. Here are things I see which could be fixed. Too much depends on root, and rootly powers cannot be voluntarily delegated over several users. (I would love to give up my power to manager printers and delegate the job to another account) File permissions are very limited, and there is not much metadata to go with files. The "everything is a file" metaphor is not true, Plan 9 gets it right(er).

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  • Using Ubuntu without any knowledge of Linux

    - by Kiran Aaditya Jhonny
    Can I still install and use Ubuntu without any basic knowledge of a Linux operating system - do I need any background knowledge of Linux to use Ubuntu? If so, what will be the limits of my experience? Also, I heard from http://www.whylinuxisbetter.net/ that I don't need any drivers for hardware and peripherals. Can somebody shed some light on this statement? P.S. I don't know if these questions have been asked yet, I searched for these (maybe I didn't search hard enough), but I didn't find any.

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  • Which service should I make mine dependant on ?

    - by Retrocoder
    I want to add a dependency to my service so that it only tries to start after most of the Windows services have started. Can anyone recommend such a service that is unlikely to have been disabled for security reasons on corporate sites. As my service needs the networking services up and running I want to make sure mine starts after these. This service may also be deployed in non-corporate environments so I’m looking for a suitable service that is unlikely to have been disabled by the end user.

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  • How to Configure Source NAT (Private IP => Public IP Outbound)

    - by DavidScherer
    I'm running VMWare ESXi Free and have Zentyal SBS 3.2 running as a Gateway. I have 5 Public IPS (CIDR/29, let's call them 69.1.1.1 - 69.1.1.5) and currently Zentyal is bound to 69.1.1.1 as the Gateway, with the other 4 Public IPs set as Virtual Interfaces in Zentyal (wan2-wan5) I have machines sitting on the Private Network (10.34.251.x) that, when going Outbound (to Google for instance) should be seen by the Internet as an IP other than the Gateway (69.1.1.1), this is because our machines need to be able to communicate with 3rd party APIs that expect these requests to come from a specific IP. From what I could find, SNAT (Source NAT) in Zentyal is used to achieve this, but I'm not sure how to configure it and cannot find a specific piece of Documentation for it at Zentyal. I've tried setting this up a couple different ways, with no results and at this point I have no idea if I'm going about this completely wrong, or my lack of experience with networking and the associated terminology is preventing me from placing the correct values in the correct fields. I get the following form to set up "SNAT" rules in Zentyal: Perhaps someone can offer some guidance and definitions for the fields above? SNAT Address Is this the Public IP I want to masquerade? Outgoing Interface Should this by my External NIC (one connected to Public 'Net), or is it the "Private" interface? It sounds as though this should be the External interface as I want the traffic from the internal network sent Out over this Interface (using a different IP than normal, anyway) Source Is the the Source on the internal network (one of the private IPs?), a public IP I want to masquerade as, or something else entirely? Destination Is this a place on the Internet (eg, "Only do this for the Site Google.com"/IP) or am I allowing myself to become confused again? Service I'm assuming this allows me to restrict which services this rule will apply to, but is it for a service on the internal network or a service being accessed on the external network? If I can offer any further details or information to make what I'm trying to do more clear, I will happily do so. Honestly any kind of help here would be very appreciated. I'm not a NetOps or anything even close, I spend most of my day writing code and my entire "team" at this company consists of "me, myself, and I" so while I try to broaden my KB at every possible opportunity, I can only learn so much, so fast and I feel like with networking especially there's just so much, coupled with a learning curve for each solution that likes to (from my limited perspective) use slightly different terminology that what I'm used to (and I don't exactly have the necessary experience to cross reference this stuff with the stuff I already know in context).

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  • How Windows Server routes PTP v2 unicast messages?

    - by Bobb
    If my server is placed in PTP v2 enabled network which has grand master clock. And the switch is PTP aware. The server is W2008R2 (soon to be W2012). I also have PTP v2 software client. How does the master clock messages are getting on with Windows Server? Does it need special PTP-aware NIC or it will be treated as normal networking traffic and the software receives it through regular NIC no problem?

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  • Kostenlose Openbooks: Handbuch zu Ubuntu GNU/Linux 12.04 LTS

    - by britta wolf
    Ab sofort steht das umfassende Handbuch zu Ubuntu GNU/Linux 12.04 LTS als kostenloses Openbook auf der Website von Galileo Computing zur Verfügung. Mit diesem Standardwerk lernt man alles Wissenswerte über die Linux-Distribution Ubuntu »Precise Pangolin« kennen. Das Buch überzeugt durch seine Themenvielfalt und Vollständigkeit. Von der Installation, der Benutzeroberfläche »Unity«, der Paketverwaltung über Optimierung, Programmierung, Migration und Kernelkompilierung bis hin zur Virtualisierung und Serverkonfiguration finden die Leser alle wichtigen Fragen in diesem über 1.000 Seiten starken Buch beantwortet. Darüber hinaus profitieren sie von mehr als 300 eigens gekennzeichneten Tipps und Tricks sowie von zahlreichen Praxisworkshops. Sowohl Einsteiger, erfahrene Anwender als auch Profis profitieren von diesem Handbuch. Die HTML-Version kann bequem im Browser gelesen werden. Das gedruckte Buch ist im Buchhandel erhältlich. Link zum Openbook: http://openbook.galileocomputing.de/ubuntu/ 

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  • How do you hide a computer name on a network? (OS X 10.6)

    - by George
    I regularly plug my Macbook Pro into a network at work, but because of the way Mac networking works, my computer's name instantly becomes available to any other Mac on the network. Is there a way to hide my computer's name so that I do not appear on the network list of other people's computers? Also, can I set this up so as a network specific profile? For instance, I would like my computer's name to show up on my home network, but not my work network.

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  • Upgrade Ubuntu linux-virtual on EC2

    - by James Ward
    I have an Ubuntu 10.10 EBS boot server on EC2. There are new updates available for it: linux-image-virtual linux-virtual Is it even ok to upgrade those packages on an EC2 server? When I do try to upgrade them I get: The following packages have been kept back: linux-image-virtual linux-virtual Should I do a dist-upgrade or something to force it? Will my instance be able to be rebooted?

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  • Oracle Linux Friday Spotlight - November 8, 2013

    - by Chris Kawalek
    Happy Friday, everyone! This week, I want to highlight a really wonderful resource, the Oracle Linux Wiki on wikis.oracle.com. You can find a lot of in-depth technical information there and it’s probably worthy of a bookmark to check in on occasionally. One of my favorite types of content on the wiki is the do it yourself hands on labs. We do these at in person events like Oracle OpenWorld and also online for our Virutal SysAdmin Days, and those are great because you can get real-time assistance if you have any questions. But, if you’re eager to learn more about Oracle Linux and don’t want to wait for one of those events, you can step through these labs in your own time. All of the information you need is on the wiki. We’ll see you next week! -Chris

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