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  • /etc/apt/apt.conf gets cleared every time I change proxy settings under settings->network->Network proxy

    - by Muriuki David
    I use a proxy server settings at work but when i get home, my network connection uses no proxy settings. every time i get home and use the proxy settings under settings-networks-Network Proxy to set to "none", the file /etc/apt/apt.conf gets cleared and the following day in the morning i have to edit the file and type in the command again, or at least copy paste from a backup file. How can i avoid this situation, its tiring, how can i make the proxy settings gui write to this file for apt-get and software center to work when i set proxy under network settings?

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  • Configure application priority to access the network

    - by Mario
    I noticed that when I am running applications such BitTorrent all the other applications have trouble accessing the network. I am sure it would be possible to limit BitTorrent's network usage but what I really want is to be able to set priorities to applications (or protocols) accessing the network. For example, let's say I put max priority for the browser (or http) and then, no matter how much bandwidth was using at the time, the http packets would always go through. Is this possible? Is there an application for Ubuntu to do this or a way to configure this on Ubuntu directly?

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  • upgrade from 11.10 to 12.04 killed my network connectivity

    - by Daniel
    I have a wired network connection that worked fine in version 11.10. I upgraded to 12.04 and immediately after the upgrade was completed, the OS reported my "cable unplugged". It is not unplugged and it is not defective. I have a D-link DFE-530TXS 10/100 ethernet NIC and I see what seems to be the generic 10050 driver loaded. Is there any way to just flush anything and everything to do with the network configuration and have Ubuntu reset/find everything again? If not...is there any way I can get it to realize that my network cable is not unplugged? (considering it worked mere minutes before). Thanks.

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  • Static IP breaks Network connection

    - by Pasquale Tedesco
    I am somewhat new to Linux. I am setting up a Web server and installed Ubuntu server 14.04 on an vSphere ESXi 5.5 host. I am connecting perfectly fine to the internet when using DHCP but when I apply my Static settings I loose the ability to connect to websites. Whats weird is I can Ping google.com but if I try wget gooogl.com it hangs at connecting to google.com (google.com):173.194.43.32:80 and I get "failed: connection refused" But if I am set to DHCP the connection resolves perfectly. Thanks # 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 auto lo iface lo inet loopback # The primary network interface auto eth0 #iface eth0 inet dhcp iface eth0 inet static address 10.1.2.25 gateway 10.1.2.2 netmask 255.255.255.0 search tsig.com dns-nameservers 10.1.2.13 10.1.2.30

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  • Can't connect to wireless network in Lubuntu

    - by mike
    I have a CISCO 802.11b WIFI Mini PCI LAN card in my IBM ThinkPad T30 laptop. Is this wireless card compatible with Lubuntu? I ran it off a Live CD and it showed the network I want to connect to – but it just won't connect. I tried installing Lubuntu and during installation it also tried to connect to the same network and still nothing. I know that the wireless network is working correctly because I can connect to it with all my other devices and it works on this very same laptop when I am running Windows.

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  • Network disabled on some wake-ups on saucy laptop

    - by Arild
    Since I upgraded to Saucy Salamander 13.10, with every third suspend or so, the network is disabled and I'm unable to re-enable it. I've had to reboot to make it run again. The network menu will have the option Enable network but clicking it will only produce a tick in the menu item, nothing else changes. How can I make it enable automatically after suspend? In the meantime, is there a workaround to at least manually re-enable it? The PC is a Lenovo IdeaPad S205 using drivers r8169 and rt2800pci.

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  • Transfer a ssh session between the same physical devices from one network to another

    - by Vivek V K
    My server has 2 IP addresses via two networks. Due to some restrictions,my client will be able to access only one of the network at a time. Hence, I want a way to transfer a live ssh session with all the open applications seamlessly from one network to another. The physical devices (client and the server) are the same. What changes is the network through which it connects. can this be done? Thanks!

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  • How to setup complete file access and control on a network

    - by user96270
    I have a media server running ubuntu 12.04 and I want it setup so that any PC on the network (windows etc) has complete access to all files, folders etc with read, write, edit, copy to, copy from permissions. No need for security (IE no password or user name, just select it on the network and start editing). I have samba installed and personal file sharing is enabled but my windows PC cannot see it on the network. I already set up another server as I described but unfortunately I can't remember how or where I found the guides for it. Any on know of a guide that covers what I want?

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  • How much network overhead does TLS add compared to a non-encrypted connection?

    - by Daniel Sterling
    (Approximately) how many more bits of data must be transferred over the network during an encrypted connection compared to an unencrypted connection? IIUC, once the TLS handshake has completed, the number of bits transferred is equal to those transferred during an unencrypted connection. Is this accurate? As a follow up, is transferring a large file over https significantly slower than transferring that file over http, given fast processors and the same (ideal) network conditions?

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  • On a local network, are you able to password protect certain folders and how (in windows xp)?

    - by Derek
    I have a local network set up for my small office which consists of me, the manager, my wife, the secretary, and a few sales people/others. I would like to share passwords over the network and other such things privately to my wife, the secretary, but would not like the sales people and others to have access to it, yet I need the others to have access to other folders/documents that I'd like to share. How would I go about doing this if not by password? Thanks in advance

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  • Linux network programming. What can I start with?

    - by Negai
    Hi everyone! I've recently got interested in Linux network programming and read quite a bit (Beej's Guide to Network Programming). But now I'm confused. I would like to write something to have some practice, but I don't know what exactly. Could please recommend me a couple of projects to start with? Thanks.

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  • Best available technology for layered disk cache in linux

    - by SpliFF
    I've just bought a 6-core Phenom with 16G of RAM. I use it primarily for compiling and video encoding (and occassional web/db). I'm finding all activities get disk-bound and I just can't keep all 6 cores fed. I'm buying an SSD raid to sit between the HDD and tmpfs. I want to setup a "layered" filesystem where reads are cached on tmpfs but writes safely go through to the SSD. I want files (or blocks) that haven't been read lately on the SSD to then be written back to a HDD using a compressed FS or block layer. So basically reads: - Check tmpfs - Check SSD - Check HD And writes: - Straight to SSD (for safety), then tmpfs (for speed) And periodically, or when space gets low: - Move least frequently accessed files down one layer. I've seen a few projects of interest. CacheFS, cachefsd, bcache seem pretty close but I'm having trouble determining which are practical. bcache seems a little risky (early adoption), cachefs seems tied to specific network filesystems. There are "union" projects unionfs and aufs that let you mount filesystems over each other (USB device over a DVD usually) but both are distributed as a patch and I get the impression this sort of "transparent" mounting was going to become a kernel feature rather than a FS. I know the kernel has a built-in disk cache but it doesn't seem to work well with compiling. I see a 20x speed improvement when I move my source files to tmpfs. I think it's because the standard buffers are dedicated to a specific process and compiling creates and destroys thousands of processes during a build (just guessing there). It looks like I really want those files precached. I've read tmpfs can use virtual memory. In that case is it practical to create a giant tmpfs with swap on the SSD? I don't need to boot off the resulting layered filesystem. I can load grub, kernel and initrd from elsewhere if needed. So that's the background. The question has several components I guess: Recommended FS and/or block layer for the SSD and compressed HDD. Recommended mkfs parameters (block size, options etc...) Recommended cache/mount technology to bind the layers transparently Required mount parameters Required kernel options / patches, etc..

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  • Windows 7 system drive says it is raw, but System Recovery starts without issues

    - by iulianchira
    I have been running Windows 7 RC1 since it was available a couple of months ago and had no issues whatsoever until today. When I start my laptop, Windows does not boot but instead Windows System Recovery starts. I've used diskpart to list the partitions on the drive and my system partition (c:) has a RAW filesystem. I really need to save all data on the disk as fast as I cant and I would really like not to have to reinstall my system.

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  • Integration tests in Continuous Integration environment: Database and filesystem state

    - by dario_ramos
    I'm trying to implement automated integration tests for my application. It's a very complex monster. You could say that its database and part of the filesystem are part of its state, because it saves image files in the hard drive, and references to those in the DB. The software needs all those, in a coherent state, to work properly. Back to writing tests: To run any relevant test, I need some image files in the filesystem, and certain records filled in the database. I thought of putting all of these in a separate folder called TestEnvironmentData in the repository, and retrieving them from the Continuous Integration Server (Team City), but a colleague said the repo is quite full as it is, and that I should set up a special directory, and databases, only in the Continuous Integration server. I don't like that because the tests success depend on me manually mantaining stuff in the server, and restoring initial state before every test becomes cumbersome. What do you guys do when you need to write integration tests for an app like this? The main goal is having an automated test harness to approach a large scale refactoring. There's lots of spaghetti code and the app's current architecture is hardly unit testable, that's why I decided on integration tests first. Any alternative approach is welcome.

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  • Setting up quotas on 64-bit RHEL6 OS with ext4 filesystem

    - by Rob Mangiafico
    Setting up a new 64 bit RHEL 6 server with ext4 FS. Have only worked with ext3 and 32bit RHEL5 before. No matter what I try, I cannot get it to work. Current settings for mount (from "mount" command): /dev/sda7 on / type ext4 (rw,noatime) proc on /proc type proc (rw) sysfs on /sys type sysfs (rw) devpts on /dev/pts type devpts (rw,gid=5,mode=620) tmpfs on /dev/shm type tmpfs (rw,noexec,nosuid) /dev/sdb1 on /backup type ext4 (rw) /dev/sda1 on /boot type ext4 (rw,noatime) /dev/sda8 on /home type ext4 (rw,noatime,usrjquota=aquota.user,grpjquota=aquota.group,jqfmt=vfsv0) /dev/sda2 on /tmp type ext4 (rw,noexec,noatime) /dev/sda6 on /usr type ext4 (rw,noatime) /dev/sda5 on /var type ext4 (rw,noatime,usrjquota=aquota.user,jqfmt=vfsv0) none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw) Essentially trying to get user/group quotas on /home, and user quotas on /var. Created the aquota.user and aquota.group files on /home and /var: -rw-r--r-- 1 root root 0 Nov 17 13:37 /home/aquota.group -rw-r--r-- 1 root root 0 Nov 17 13:37 /home/aquota.user -rw------- 1 root root 0 Nov 17 11:43 /var/aquota.user When I run quoatcheck I get: quotacheck -vguma quotacheck: WARNING - Quotafile /home/aquota.user was probably truncated. Cannot save quota settings... quotacheck: WARNING - Quotafile /home/aquota.group was probably truncated. Cannot save quota settings... quotacheck: WARNING - Quotafile /var/aquota.user was probably truncated. Cannot save quota settings... Then I attempt quotaon and get: quotaon -av quotaon: Cannot find quota file on /home [/dev/sda8] to turn quotas on/off. quotaon: Cannot find quota file on /home [/dev/sda8] to turn quotas on/off. quotaon: Cannot find quota file on /var [/dev/sda5] to turn quotas on/off. quota rpms installed: rpm -qa|grep -i quota quota-3.17-16.el6.x86_64 quota-devel-3.17-16.el6.x86_64 Any ideas what I'm doing wrong or what I should adjust to get quotas to work as they do in ext3/32bit?

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  • Group policy waited for the network subsystem

    - by the-wabbit
    In an AD domain with Windows Server 2008 R2 DCs users are complaining about delays in the bootup process of the clients. The group policy log reveals that the client is waiting ~ 20-50 seconds for "the network subsystem": Event 5322, GroupPolicy Group policy waited for 29687 milliseconds for the network subsystem at computer boot. This appears to be domain-specific as machines joining a different domain from the same network do not experience any delays and Event 5322 reports <1000 ms wait times at startup. It happens on virtual and physical machines alike, so it does not look like a hardware- or driver-related issue. Further investigation has shown that the client is taking its time before issuing DHCP requests. In the network traces, I can see IPv6 router solicitations and multicast DNS name registrations as soon as the network driver is loaded and the network connection is reported "up" in the event log (e1cexpress/36). Yet, the DHCPv4 client service seems to take another 15-50 seconds to start (Dhcp-Client/50036), so the IPv4 address remains unconfigured for a while. The DHCP client's messages in the event log are succeeding the service start of the "Sophos Anti-Virus" service (Sophos AV 10.3 package), which I suspect to be the culprit - the DHCP client service dependencies include the TDI Support driver which might be what Sophos is using to intercept network traffic: Network Location Awareness seems to break at startup as a side-effect, I see that off-site DCs are contacted due to what seems like a race condition between the GP client and the DHCP client / NLA service startup. I could set the Group Policy Client service to depend on NLA, yet this still would not eliminate the delay. Also, I am not all that sure that this is a good idea. Is there a known resolution which would eliminate the startup delay?

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  • What is the best/easiest way to use scripts to analyze network traffic?

    - by yungin
    I'm looking to analyze packets via scripts. I'd like to use something high level. I'm in a mac/linux environment. I'm currently looking at different python+libpcap libraries. Perhaps lua+wireshark too. Maybe tcpdump+bash (but not sure that has a lot of info i can use). I also heard good things about scapy. Not sure. I'm wondering if you have any recommendations? There's quite a few of them out there. What have you found that works best? I'd definitely want something scriptable not something that I need to compile (like c/c++, etc)

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  • FAT filesystem analysis tool

    - by Andy
    I have a dump a FAT file system. Is there a windows tool I can use to analyse it, including: Provide basic information (sector size etc.) Validate the file system, basic corruption checking Allow the files and directory structure to be viewed and possibly edited (i.e mounting as a windows partition) Thanks, Andy

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  • Better filesystem for ZODB and Plone.app.blob

    - by h2o
    I am interested to know which Linux file system is best for hosting Zope's Object Database (Data.fs) and Plone.app.blob (blobstorage). Various reviews from the Internet suggests that XFS is good for hosting both. XFS is fast and works well with large files. Anyone using XFS for Zope or Plone? What optimization flags, if any, do you use for XFS? Note that this is a repost. I originally asked this on StackOverflow and was given a suggestion to post on Severfault instead.

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  • Linux's best filesystem to work with 10000's of files without overloading the system I/O

    - by mhambra
    Hi all. It is known that certain AMD64 Linuxes are subject of being unresponsive under heavy disk I/O (see Gentoo forums: AMD64 system slow/unresponsive during disk access (Part 2)), unfortunately have such one. I want to put /var/tmp/portage and /usr/portage trees to a separate partition, but what FS to choose for it? Requirements: * for journaling, performance is preffered over safe data read/write operations * optimized to read/write 10000 of small files Candidates: * ext2 without any journaling * BtrFS In Phoronix tests, BtrFS had demonstrated a good random access performance (fat better than XFS thereby it may be less CPU-aggressive). However, unpacking operation seems to be faster with XFS there, but it was tested that unpacking kernel tree to XFS makes my system to react slower for 51% disregard of any renice'd processes and/or schedulers. Why no ReiserFS? Google'd this (q: reiserfs ext2 cpu): 1 Apr 2006 ... Surprisingly, the ReiserFS and the XFS used significantly more CPU to remove file tree (86% and 65%) when other FS used about 15% (Ext3 and ... Is it same now?

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