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• pptpd-logwtmp.so config wrong ip address

  - by rgc

  i have setup a pptp vpn on ubuntu 10.04, and i config local ip address , remote ip address as following: local IP address 10.0.30.100 remote IP address 192.168.13.100 after i use windows to connect to vpn server in windows , i only could send packets, can not receive any packets. i also check the pptp log in ubuntu server, and find this strange thing rcvd [IPCP ConfAck id=0x1 <compress VJ 0f 01> <addr 10.0.30.100>] rcvd [IPCP ConfReq id=0x2 <compress VJ 0f 01> <addr 192.168.13.100> <ms-dns1 202.119.32.6> <ms-dns2 202.119.32.12>] sent [IPCP ConfAck id=0x2 <compress VJ 0f 01> <addr 192.168.13.100> <ms-dns1 202.119.32.6> <ms-dns2 202.119.32.12>] Cannot determine ethernet address for proxy ARP local IP address 10.0.30.100 remote IP address 192.168.13.100 pptpd-logwtmp.so ip-up ppp0 **172.25.146.174** i did not set 172.25.146.174, it should be 192.168.13.100, can anyone tell me what should i do to fix this problem?

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• Karmic iptables missing kernel moduyles on OpenVZ container

  - by luison

  After an unsuccessful p2v migration of my Ubuntu server to an OpenVZ container which I am stack with I thought I would give a try to a reinstall based on a clean OpenVZ template for Ubuntu 9.10 (from the OpenVZ wiki) When I try to load my iptables rules on the VM machine I've been getting errors which I believe are related to kernel modules not being loaded on the VM from the /vz/XXX.conf template model. I've been testing with a few post I've found but I was stack with the error: WARNING: Deprecated config file /etc/modprobe.conf, all config files belong into /etc/modprobe.d/. FATAL: Could not load /lib/modules/2.6.24-10-pve/modules.dep: No such file or directory iptables-restore v1.4.4: iptables-restore: unable to initialize table 'raw' Error occurred at line: 2 Try `iptables-restore -h' or 'iptables-restore --help' for more information. I read about the template not loading all iptables modules so I added modules to the XXX.conf of the VZ virtual machine like this: IPTABLES="ip_tables iptable_filter iptable_mangle ipt_limit ipt_multiport ipt_tos ipt_TOS ipt_REJECT ipt_TCPMSS ipt_tcpmss ipt_ttl ipt_LOG ipt_length ip_conntrack ip_conntrack_ftp ip_conntrack_irc ipt_conntrack ipt_state ipt_helper iptable_nat ip_nat_ftp ip_nat_irc" As the error remained I read that I should build dependencies again on the virtual machine: depmod -a but this returned an error: WARNING: Couldn't open directory /lib/modules/2.6.24-10-pve: No such file or directory FATAL: Could not open /lib/modules/2.6.24-10-pve/modules.dep.temp for writing: No such file or directory So I read again about creating the directory empty and redoing "depmod -a" it. I now don't get the dependancies error but get this and I don't have a clue how to proceed: WARNING: Deprecated config file /etc/modprobe.conf, all config files belong into /etc/modprobe.d/. FATAL: Module ip_tables not found. iptables-restore v1.4.4: iptables-restore: unable to initialize table 'raw' Error occurred at line: 2 Try `iptables-restore -h' or 'iptables-restore --help' for more information. I understand that iptables rules have to be different on the VM machine and perhaps some of the rules we are trying to apply (from our physical server) are not compatible but these are just source IP and destination port checks that I would like to be able to have available . I've heard that on the CentOS template there are no issues with this, so I understand is to do with VM config. Any help would be greatly appreciated.

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• Libvirt / QEmu Machine Fails and Refuses Restart Because of Memory Allocation Errors

  - by Elmar Weber

  I'm having a problem with libvirt. On a system restart all virtual machines (VMs) are started without a problem and keep running. Then at some point in time a set of machines shuts down according to their log. When I try to restart the machine, I'm getting an error that the memory allocation failed, although more than enough memory is free. server ~ # free total used free shared buffers cached Mem: 16176648 16025476 151172 0 285432 950300 -/+ buffers/cache: 14789744 1386904 Swap: 0 0 0 server ~ # virsh start zimbra error: Failed to start domain zimbra error: Unable to read from monitor: Connection reset by peer server ~ # tail -n 4 /var/log/libvirt/qemu/zimbra.log LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/sbin:/sbin:/bin QEMU_AUDIO_DRV=none /usr/bin/kvm -S -M pc-0.12 -enable-kvm -m 3072 -smp 2,sockets=2,cores=1,threads=1 -name zimbra -uuid d05ddb7a-83c4-a77b-d8bc-a322648520cf -nodefconfig -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/zimbra.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -drive file=/var/lib/libvirt/images/zimbra.img,if=none,id=drive-ide0-0-0,format=raw -device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0,bootindex=1 -netdev tap,fd=19,id=hostnet0 -device rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:21:a9:ad,bus=pci.0,addr=0x3 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -usb -vnc 192.168.1.2:25 -k de -vga cirrus -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4 char device redirected to /dev/pts/2 Failed to allocate 3221225472 B: Cannot allocate memory 2012-07-06 08:42:56.076+0000: shutting down server ~ # uname -a Linux server 3.2.0-26-generic #41-Ubuntu SMP Thu Jun 14 17:49:24 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux The system is a Ubuntu 12.04 server. The problem seems to occurs since the last restart, which was due to a number of package upgrades and a kernel upgrade. I tried booting with the previous kernel, the problem persists. I was not able to pinpoint an exact event when the machines fail, they do it at nearly the same time. The last time a duplicity job was running, this was not always the case however. Any suggestions on how to debug this? Best regards, elm

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• Why won't my service start, and why doesn't upstart output any errors?

  - by Alex Waters

  I am trying to 'start gunicorn' as a service via upstart as user ale. I'm using gunicorn/flask on ubuntu 12.04 w/ init (upstart 1.5) Here is my /etc/init/gunicorn.conf setuid btw setgid flask script export HOME=/home/btw export WORKON_HOME=$HOME/.virtualenvs . $HOME/.virtualenvs/default/bin/activate cd $HOME/flask workon default gunicorn -c gunicorn.py bw:app end script It doesn't output anything other than gunicorn start/running, process 12992. If i then do 'status gunicorn' I get stop/waiting. any ideas on how to debug this? I tried following http://upstart.ubuntu.com/wiki/Debugging but it didn't help. If I do the following as user ale in the app's directory: 1. workon default 2. gunicorn -c gunicorn.py bw:app then Gunicorn runs fine. Here is ~/flask/gunicorn.py: bind = "0.0.0.0:8080" workers = 3 backlog = 2048 worker_class = "gevent" debug = True daemon = False pidfile ="/tmp/gunicorn.pid" log_level = "debug" accesslog = "/var/log/gunicorn/access.log" errorlog = "/var/log/gunicorn/error.log" user = "btw" group = "flask" Also, /var/log/error.log doesn't show anything new when I try to start the Gunicorn service. If I start it manually, it shows that the workers have been loaded, etc. Thanks for any help / suggestions!

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• publickey authentication only works with existing ssh session

  - by aaron

  publickey authentication only works for me if I've already got one ssh session open. I am trying to log into a host running Ubuntu 10.10 desktop with publickey authentication, and it fails when I first log in: [me@my-laptop:~]$ ssh -vv host ... debug1: Next authentication method: publickey debug1: Offering public key: /Users/me/.ssh/id_rsa ... debug2: we did not send a packet, disable method debug1: Next authentication method: password me@hosts's password: And the /var/log/auth.log output: Jan 16 09:57:11 host sshd[1957]: reverse mapping checking getaddrinfo for cpe-70-114-155-20.austin.res.rr.com [70.114.155.20] failed - POSSIBLE BREAK-IN ATTEMPT! Jan 16 09:57:13 host sshd[1957]: pam_sm_authenticate: Called Jan 16 09:57:13 host sshd[1957]: pam_sm_authenticate: username = [astacy] Jan 16 09:57:13 host sshd[1959]: Passphrase file wrapped Jan 16 09:57:15 host sshd[1959]: Error attempting to add filename encryption key to user session keyring; rc = [1] Jan 16 09:57:15 host sshd[1957]: Accepted password for astacy from 70.114.155.20 port 42481 ssh2 Jan 16 09:57:15 host sshd[1957]: pam_unix(sshd:session): session opened for user astacy by (uid=0) Jan 16 09:57:20 host sudo: astacy : TTY=pts/0 ; PWD=/home/astacy ; USER=root ; COMMAND=/usr/bin/tail -f /var/log/auth.log The strange thing is that once I've got this first login session, I run the exact same ssh command, and publickey authentication works: [me@my-laptop:~]$ ssh -vv host ... debug1: Server accepts key: pkalg ssh-rsa blen 277 ... [me@host:~]$ And the /var/log/auth.log output is: Jan 16 09:59:11 host sshd[2061]: reverse mapping checking getaddrinfo for cpe-70-114-155-20.austin.res.rr.com [70.114.155.20] failed - POSSIBLE BREAK-IN ATTEMPT! Jan 16 09:59:11 host sshd[2061]: Accepted publickey for astacy from 70.114.155.20 port 39982 ssh2 Jan 16 09:59:11 host sshd[2061]: pam_unix(sshd:session): session opened for user astacy by (uid=0) What do I need to do to make publickey authentication work on the first login? NOTE: When I installed Ubuntu 10.10, I checked the 'encrypt home folder' option. I'm wondering if this has something to do with the log message "Error attempting to add filename encryption key to user session keyring"

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• Securing SSH/SFTP and best practices on security

  - by MultiformeIngegno

  I'm on a fresh VPS with Ubuntu Server 12.04. I wanted to ask you the good practices to apply to enhance security over a stock Ubuntu-server. This is what I did up to now: I added Google Authenticator to SSH, then I created a new user (whom I'll use instead of 'root' for SSH & SFTP access) which I added to my /etc/sudoers list below 'root', so now it's: # User privilege specification root ALL=(ALL:ALL) ALL new_user ALL=(ALL:ALL) ALL Then I edited sshd_config and set PermitRootLogin to 'no'. Then restarted the ssh service. Is this ok? There are a few things I'd like to ask you though: 1) What's the sense of adding a new (sudoer) user whilst the root user still exist (ok it can't access with root privilege but it's still there..)? 2) System files are owned by 'root'.. I want to use my new_user to access via SFTP but with it I can't edit those files!! Should I mass-CHMOD 'em so that new_user has write perms too? What's the good practice on this? Thanks in advance, I hope you'll tell me if I did something wrong and/or other ways to secure the system. :)

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• wget is working only when used with sudo

  - by Yusuf

  I'm having quite a strange behavior with wget since yesterday. I can download files by using sudo wget, but when I try the same file with only wget, I can get this error: yusufh@ubuntu-yuh:~$ wget http://www.kegel.com/wine/winetricks --2010-12-17 09:34:11-- http://www.kegel.com/wine/winetricks Resolving www.kegel.com... failed: Name or service not known. wget: unable to resolve host address `www.kegel.com' and with sudo wget: yusufh@ubuntu-yuh:~$ sudo wget http://www.kegel.com/wine/winetricks --2010-12-17 09:35:37-- http://www.kegel.com/wine/winetricks Connecting to 127.0.0.1:5865... connected. Proxy request sent, awaiting response... 200 OK Length: 190672 (186K) [text/plain] Saving to: `winetricks' 100%[==================================================================================================>] 190,672 --.-K/s in 0.03s 2010-12-17 09:35:37 (6.92 MB/s) - `winetricks' saved [190672/190672] After the comments below, here is an update: I can use Google Chrome or Firefox perfectly without running it as root. I use ntlmaps to connect to the office proxy. So I need to use 127.0.0.1:5865 as the proxy for clients. Result for env | grep -i proxy: NO_PROXY=localhost,127.0.0.0/8,*.local, http_proxy=127.0.0.1:5865 ftp_proxy=127.0.0.1:5865 all_proxy=socks://127.0.0.1:5865/ ALL_PROXY=socks://127.0.0.1:5865/ https_proxy=127.0.0.1:5865 no_proxy=localhost,127.0.0.0/8,*.local while sudo env | grep -i proxy is empty! HELP!

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• PHP sessions currupt

  - by Baversjo

  Using symfony framework 1.4 I have created a website. I'm using sfguard for authentication. Now, this is working great on WAMP (windows). I can login to several accounts on different browsers and use the website. I have ubuntu server 9.10 running apache (everything up to date and default configuration). On my server, when I login to the website in one browser it works great. When I on my other computer login with another user account on the public website, the login is successful. But when I refresh/go to another page the first user is shown as logged in instead! Also, when I press logout, It's not showing that I'm logged out after page load. When I press f5 again I'm logged out. As mentioned, all this works as expected on my local installation. I'm thinking there something wrong with my PHP session configuration on my ubuntu server, but I've never touched it.. Please help me. This is a school project and I'm presenting it today :(

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• RAM being displayed is lesser than the actual in my Windows 7

  - by Prateek Somani

  I am using Windows 7 and Ubuntu on the same machine. Earlier I had 3 GB of RAM,but now the Windows is displaying just 1 GB of RAM. Please also find the output of the free command in my Ubuntu : total used free shared buffers cached Mem: 1008208 904808 103400 5736 13516 239596 -/+ buffers/cache: 651696 356512 Swap: 3127292 10252 3117040 Has the swap memory consumed my 2 GB of RAM? Will I be able to use the whole of 3GB of the RAM in my Windows? Regards, Prateek Update : I tried to run the lshw command and I got the following output : *-memory description: System Memory physical id: 1b slot: System board or motherboard size: 1GiB *-bank:0 description: SODIMM DDR3 Synchronous 1067 MHz (0.9 ns) product: HMT112S6BFR6C-H9 vendor: Hynix physical id: 0 serial: 2C71D069 slot: Bottom - Slot 1 size: 1GiB width: 64 bits clock: 1067MHz (0.9ns) *-bank:1 description: SODIMM DDR3 Synchronous 1067 MHz (0.9 ns) [empty] product: 16JSF25664HZ-1G4F1 vendor: Micron physical id: 1 serial: FD421821 slot: Bottom - Slot 2 width: 64 bits clock: 1067MHz (0.9ns) Why it is able to detect the vendor/product name of the bank-1 RAM, why can't it detect the RAM size and other details ? Has my RAM got faulty?

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• SSH freeze when UFW is enabled

  - by Cristian Vrabie

  I have a small Ubuntu 10.10 server and i recently noticed a weird behavior (not sure if it was happening before). If I have ufw enabled (with default deny all in, allow all out, allow all http, allow all on a random port i use for ssh) when i perform some actions in a ssh sesion, the ssh console completely freezes. The server continues to work and if i close the console i can start another ssh session. This happens no matter from where I log in (tried from another ubuntu and a mac). The actions are fairly reproducible, for example vim some config files (though vim-ing other files works), cat some other file, etc. The freeze never happens if ufw is disabled. Any idea what's going on? Thanks! Cristian Addition: if you're wondering, yes, I have TcpKeepAlive on yes and I doubt is related (it would happen with ufw disabled too) As requested: my ufw conf below. Also, i don't know if it has something to do but the server has 2 ips. On one is configured the ssh domain, and on one to serve hhtp (via apache2) Status: active Logging: on (low) Default: deny (incoming), allow (outgoing) New profiles: skip To Action From -- ------ ---- 19922/tcp ALLOW IN Anywhere 9418/tcp ALLOW IN Anywhere 80/tcp ALLOW IN Anywhere 443/tcp ALLOW IN Anywhere

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• Install a KVM guest with LVM partitioning on an LVM partitioned host using virt-install fails, volume group already exists

  - by Rilik84

  our setup consists of a ubuntu 10.04 kvm host server with LVM, on top of which we install the ubuntu 10.04 virtual machines via virt-install and preseed. Each VM has a dedicated logical volume which we pass to virt-install via the "--disk path=/dev/sysvg/vm-name" parameter. The virtual machines themselves are using LVM as well. Virt-install seems to have a few issues with this setup. Say we want to install two virtual machines in parallel. The first vm installs correctly while the second halts during the partitioning, complaining with this error: "volume group name already in use". I tried removing the logical volumes, recreated them, rebooted the kvm host to clear any leftovers but the issue perists. The preseed is telling the vms to create a volume group named "sysvg", which is the same name used by the volume group of the kvm host. Considering this I did another test: I got rid of the preseed part taking care of the partitioning/lvm creation and started the creation of two vms in parallel. If, when prompted, I instruct the vms' installer to do a guided partitioning of the disk with LVM, it will still fail giving this different error on both the vms: Physical Volume /dev/sda5 is already in volume group sysvg. As I wrote, sysvg is the volume group used by the KVM host. So I thought the name clashing was the issue. By removing the preseed part I skipped the volume group naming. I can't understand how the virtual machines would be aware of the presence of that volume group since they're supposed to be isolated from it, especially after I removed and recreated the logical volumes dedicated to them. That detail should not be exposed at all to them! Thanks for the help. I'm clueless.

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• Postfix mail forwarder

  - by Andrew

  Hello, I just bought a dedicated server and I'm trying to install a webserver on it. The server is Ubuntu 10.04. I installed ftp, nginx, php, mysql, bind and now I have to install mail server. For the mail server I'm using Postfix, because it's recomended on ubuntu. I installed Postfix with apt-get install postfix but mail() function from php wasn't working. After a little debug I found the way to solve this : I created an empty file /etc/postfix/main.cf and it worked good. I do have a mx record like this mail 5M IN A xxx.xxx.xxx.xxx example.com. 5M IN MX 1 mail.example.com. After that I wanted to forward all e-mails to my GMail address. So I googled for it and I found in the official docs Virtual Domain Host Forwarding I added these lines in main.cf virtual_alias_domains = example.com virtual_alias_maps = hash:/etc/postfix/virtual I created map file and I placed this line in it @example.com [email protected] I run in terminal postmap /etc/postfix/virtual postfix reload The result: I can send e-mail from php with mail() function, but when I send an email to [email protected] that e-mail isn't forwarded to my Gmail. How to solve this? -Andrew I also tried this but not working http://rackerhacker.com/2006/12/26/postfix-virtual-mailboxes-forwarding-externally/ It works now! But I don't know what the problem was. I just installed "Mail Server" from Tasksel and after that it worked fine. Can anyone tell me what Tasksel installed or that it changed ?

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• Cannot start Postgres daemon after installing with Yum

  - by Sean the Bean

  I was trying to install Postgres 9.1.4 on Fedora 17 using Yum. If I do: sudo yum install postgres-libs sudo yum install postgres sudo yum install postgis All the installs appear to complete successfully (i.e., no errors), but I cannot start the Postgres daemon using: service postgresql initdb Like the official Postgres download guide says to do (http://www.postgresql.org/download/linux/redhat/). The error says Unknown operation initdb. RPM tells me that it installed psql to /usr/bin/, which I confirmed. It turns out that only a few components installed correctly (psql, pg_dump, pg_configure, and a few others), but most are missing (e.g., pg_ctl and postgres). I've tried several different configurations and had several of my coworkers (with more linux experience than me) look at it, but so far nothing has worked. Two of them have also run into similar issues installing Postgres using apt-get on Ubuntu, which makes me think the rpm isn't doing its job. It seems the only solution to build it from source, which is more robust anyway, but of course it takes longer. I'm wondering, though, if anyone else has run into this issue and/or has successfully installed Postgres on either Fedora or Ubuntu using a package manager like yum or apt-get? Is the rpm broken?

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• Access Existing Linux Installation from Windows Bootloader - Linux Installed and Then Windows 7

  - by nicorellius

  My hard drive is failing. I installed a new drive, and the installed Ubuntu 12.04 to try to rescue data. Realized that I wanted to install Windows and just access drives without transferring data (there are loads of it). I then installed Windows 7. Now my drive only boots to Windows 7. How do I access Linux and make Windows boot-loader load Linux? I originally thought I would just not use the Ubuntu installation but now I think I want it to be a dual boot system. What are good boot-loaders to install for this kind of dual boot situation? Can I accomplish this with BCDEdit? If I would have done this the other way (Windows first, then Linux) everything would be fine, but I didn't and now I'm trying to fix this. The problem I have is that I don't really know how to boot into Linux to retrieve any files I need. I guess using the disc would work, but I'm not sure how to go about this.

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• Does the same lame settings (--alt-preset standard) have differrent names?

  - by erikric

  I've always used windows, and therefore EAC to rip my CDs, but since I've started using Ubuntu more often, I decided to try to rip some albums there. I ended up using k3b (since I found it in the Ubuntu Software center. Tried to install RubyRipper first, but when 'sudo apt-get install ' or UDC fails, a Windows user like me is lost) The real question here is about the settings for the lame encoder. I'm used to just writing --alt-preset standard, and everything works like a charm, but the default in k3b look like this: lame -r --bitwidth 16 --little-endian -s 44.1 -h --tt %t --ta %a --tl %m --ty %y --tc %c --tn %n - %f I assume these are some sensible lame settings, and not a malicious perl script (although it looks like it). It seems to me like some of these ought to be there, and that I can not overwrite the whole thing with my good ol' --alt-preset. So, the question is do I need to replace anything, or is -h the same as old --alt-preset? Is it a difference between '--preset standard' and '--alt-preset standard'? And are those the same as -V 2?

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• Linux on HP Envy

  - by Oscar Godson

  OK, the Ubuntu forums aren't helping and I thought maybe you guys here could help. First off, does anyone know the best flavor of Linux to use on an HP Envy? what has the best support out of the box? If not, does anyone know how the hell to get the following to work on Ubuntu 10.04: The touchpad to work at all? Right now, right clicking doesnt work at at all, and left clicks dont work while you have another finger on the pad at all. It jumps all over. ALSO, the multi-touch isn't clickable, but it's for sure a multi-touch touchpad. Works in W7 and can do things like a MBP in W7 The computer feels like it's on fire... i think im missing some driver. Seems odd that the random meta keys like calc, email, brightness, right click, etc work, but not the touchpad? The video card seems fine, but i haven't tested compiz fully yet... Thanks so much to anyone who helps. i want to get back to linux after a couple years on Mac. :)

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• Windows 7 won't boot from any bootloader except for Windows Boot Manager after partition resize

  - by user2468327

  I have a triple boot system on a single SSD: OSX, Windows 7, and Ubuntu. I use Chimera (basically another version of Chameleon) as my bootloader. Usually I can boot all 3 OSs without any issue, but after using GParted to make my Ubuntu partition 2 Gigs larger, Windows 7 throws me an error when trying to boot to it from either Chimera or Grub. The error is consistently: `0xc000000e can't find \Boot\BCD" (slightly paraphrased). However, I can still get into Windows by selecting Windows Boot Manager from the boot options in my BIOS. I've already tried several known fixes for similar issues, including bootrec /rebuildbcd (and variations), and BootRec.exe/fixMBR + BootRec.exe/fixBoot. I've also tried Chkdsk. At best this has made it so Windows 7 boots on its own by default (making me have to reinstall Chimera and change back my boot settings in the BIOS). At worst this made it so Windows won't boot period. Now I'm back full circle where I started. A detail that might be useful is that bootrec /rebuildbcd says that the number of found Windows installations is 0. I'm fairly certain that I don't have a hybrid MBR. Mainly because I have a UEFI BIOS, and with that, it appears each OS can support a GPT. So it would kind of pointless to have and deal with. I may be wrong though, I couldn't find any way of finding out for sure online. However, I know for sure that the version of Windows I have installed is the UEFI version, as well as every partition tool I've used to look at my boot drive tells me it's GPT. How do I get it back so I can boot Windows 7 through another bootloader so I don't have to manually select it in the BIOS? Preferably without a reinstall.

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• How important is dual-gigabit lan for a super user's home NAS?

  - by Andrew

  Long story short: I'm building my own home server based on Ubuntu with 4 drives in RAID 10. Its primary purpose will be NAS and backup. Would I be making a terrible mistake by building a NAS Server with a single Gigabit NIC? Long story long: I know the absolute max I can get out of a single Gigabit port is 125MB/s, and I want this NAS to be able to handle up to 6 computers accessing files simultaneously, with up to two of them streaming video. With Ubuntu NIC-bonding and the performance of RAID 10, I can theoretically double my throughput and achieve 250MB/s (ok, not really, but it would be faster). The drives have an average read throughput of 83.87MB/s according to Tom's Hardware. The unit itself will be based on the Chenbro ES34069-BK-180 case. With my current hardware choices, it'll have this motherboard with a Core i3 CPU and 8GB of RAM. Overkill, I know, but this server will be doing other things as well (like transcoding video). Unfortunately, the only Mini-ITX boards I can find with dual-gigabit and 6 SATA ports are Intel Atom-based, and I need more processing power than an Atom has to offer. I would love to find a board with 6 SATA ports and two Gigabit LAN ports that supports a Core i3 CPU. So far, my search has come up empty. Thus, my dilemma. Should I hold out for such a board, go with an Atom-based solution, or stick with my current single-gigabit configuration? I know there are consumer NAS units with just one gigabit interface (probably most of them), but I think I will demand a lot more from my server than the average home user. Any advice is appreciated. Thanks.

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• VMware, Ubuntu emulator on Mac: strage "free space" information

  - by Patrick

  hi, I'm using Ubuntu emulator (VMware) on a Macbook. My mac says 3gb free, while my Ubuntu emulator says 16gb free. How was wondering if my Ubuntu installation is "reserving" those 16gb, or it is just a wrong parameter. thanks

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• Synergy Key Mapping

  - by Tauren

  I'm running a Synergy server on Ubuntu and a Synergy+ client on OSX. The server has a standard windows keyboard with shift, ctrl, windows, and alt keys. My MacBookPro has shift, fn, control, alt/option, and command keys. When I press ctrl-c, ctrl-v, etc, the appropriate copy/paste action doesn't happen on the Mac, but it does in Ubuntu. If I'm controlling the mac, and press alt-c, alt-v, then I get the copy/paste action. So I played around with key mapping in synergy.conf and found that the following allows me to do copy/paste with ctrl-c/ctrl-v: section: screens godzilla: mbp.local: ctrl = alt alt = ctrl end Is this all that I need to do? Or are there other mappings that will help as well? The synergy configuration page refers to the following key mappings. What are the equivalent keys for each of these on the Windows keyboard and Mac keyboard? What is a meta or super key? shift = {shift|ctrl|alt|meta|super|none} ctrl = {shift|ctrl|alt|meta|super|none} alt = {shift|ctrl|alt|meta|super|none} meta = {shift|ctrl|alt|meta|super|none} super = {shift|ctrl|alt|meta|super|none} Thanks!

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• How to access Windows Azure management portal from Linux/Ubuntu

  - by Zaar Hai

  Good day everyone! I have only Ubuntu/Debian machines in my office. I've registered for Windows Azure platform and try to enter their management portal (https://windows.azure.com/default.aspx), but it requires Microsoft Silverlight. I've tried installing latest Moonlight plugin availabing for Ubuntu 11.04, but without any success - after login I see blank page and nothing more (tried both firefox 7.0.1 and chromium-14). Does anyone know how to enter Microsoft Azure management portal from Ubuntu 11.04 or any other linux? Thank you, Zaar

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• libvirt's dnsmasq does not respond to dns queries or provide dhcp

  - by Jeremy

  This is on Ubuntu 10.04 server, using KVM to run Ubuntu guests. This system has been working for a long time and I have not changed anything (other than applying security updates), but today I found dnsmasq no longer responds to requests. I cannot say how long this has been broken for me because I don't frequently use the NAT'd guests. So it could have started just after the last updates or some other event and I just now found it. I can connect to port 53 with telnet at 192.168.122.1. I've flushed ip-tables to be sure it wasn't firewall rules and that is not the problem. dnsmasq is running, virsh reports default network as stared. I can't find ANY information on troubleshooting libvirt dnsmasq except that it won't play well with other instances of dnsmasq, which is not the problem. I cannot even find where log entries might be for this service. Any ideas on where to look for more information? edit to add: I added another network and that one works fine. I guess I have a workaround but would still like to figure out how to troubleshoot this problem.

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• Virtualbox port forwarding with iptables

  - by jverdeyen

  I'm using a virtualmachine (virtualbox) as mailserver. The host is an Ubuntu 12.04 and the guest is an Ubuntu 10.04 system. At first I forwarded port 25 to 2550 on the host and added a port forward rule in VirtualBox from 2550 to 25 on the guest. This works for all ports needed for the mailserver. The guest has a host only connection and a NAT (with the port-forwarding). My mailserver was receiving and sending mail properly. But all connections are comming from the virtualbox internal ip, so every host connection is allowed, and that's not what I want. So.. I'm trying to skip the VirtualBox forwarding part and just forward port 25 to my host only ip of the guest system. I used these rules: iptables -F iptables -P INPUT ACCEPT iptables -P OUTPUT ACCEPT iptables -P FORWARD ACCEPT iptables -t nat -P PREROUTING ACCEPT iptables -t nat -P POSTROUTING ACCEPT iptables -A INPUT --protocol tcp --dport 25 -j ACCEPT iptables -A INPUT -i lo -j ACCEPT iptables -A INPUT -s 192.168.99.0/24 -i vboxnet0 -j ACCEPT echo 1 > /proc/sys/net/ipv4/ip_forward iptables -t nat -A PREROUTING -p tcp -i eth0 -d xxx.host.ip.xxx --dport 25 -j DNAT --to 192.168.99.105:25 iptables -A FORWARD -s 192.168.99.0/24 -i vboxnet0 -p tcp --dport 25 -j ACCEPT iptables -t nat -A POSTROUTING -s 192.168.99.0 -o eth0 -j MASQUERADE iptables -L -n But after these changes I still can't connect with a simple telnet. (Which was possible with my first solution). The guest machine doesn't have any firewall. I only have one network interface on the host (eth0) and a host interface (vboxnet0). Any suggestions? Or should I go back to my old solution (which I don't really like). Edit: bridge mode isn't an option, I have only on IP available for the moment. Thanks!

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• Linux server: Dropped packets

  - by Lars

  I see dropped packets using ifconfig on my eth0 interface: eth0 Link encap:Ethernet HWaddr 00:15:17:0d:03:ca inet addr:10.0.1.2 Bcast:10.0.1.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:9000 Metric:1 RX packets:30268348 errors:0 dropped:70721 overruns:0 frame:0 TX packets:133076885 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:8699434077 (8.6 GB) TX bytes:194937313025 (194.9 GB) Interrupt:16 Memory:feae0000-feb00000 When i use ethtool -S i dont see anything wrong: NIC statistics: rx_packets: 30267138 tx_packets: 133074510 rx_bytes: 8699356158 tx_bytes: 194934147340 rx_broadcast: 35296 tx_broadcast: 5435 rx_multicast: 0 tx_multicast: 0 rx_errors: 0 tx_errors: 0 tx_dropped: 0 multicast: 0 collisions: 0 rx_length_errors: 0 rx_over_errors: 0 rx_crc_errors: 0 rx_frame_errors: 0 rx_no_buffer_count: 0 rx_missed_errors: 0 tx_aborted_errors: 0 tx_carrier_errors: 0 tx_fifo_errors: 0 tx_heartbeat_errors: 0 tx_window_errors: 0 tx_abort_late_coll: 0 tx_deferred_ok: 0 tx_single_coll_ok: 0 tx_multi_coll_ok: 0 tx_timeout_count: 0 tx_restart_queue: 0 rx_long_length_errors: 0 rx_short_length_errors: 0 rx_align_errors: 0 tx_tcp_seg_good: 5757001 tx_tcp_seg_failed: 0 rx_flow_control_xon: 8649 rx_flow_control_xoff: 62072 tx_flow_control_xon: 0 tx_flow_control_xoff: 0 rx_long_byte_count: 8699356158 rx_csum_offload_good: 30212111 rx_csum_offload_errors: 0 rx_header_split: 10857552 alloc_rx_buff_failed: 0 tx_smbus: 0 rx_smbus: 0 dropped_smbus: 0 rx_dma_failed: 0 tx_dma_failed: 0 I am running Ubuntu 12.04 with kernel 3.2.0-30-generic #48-Ubuntu SMP I have pinged every device on my internal network for about 24 hours, without packet loss. Also checked my router and my interface to the WAN, also no errors there. Does anyone have any clue?

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• Authentication required by wireless network

  - by Roman

  I would like to use a wireless network from Ubuntu. In the network drop-down menu I select a network (this is a University network I have an account there). Then I get a windows with the following fields: Wireless Security: [WPA&WPA2 Enterprise] Authentication: [Tunneled TLS] Anonymous Identity: [] CA Certificate: [(None)] Inner Authentication: [some letters] User Name: [] Password: [] I put there my user name and password and do not change default value and leave "Anonymous Identity"blank. As a result of that I get "Authentication required by wireless network". How can I solve this problem? I think it is important to notice that our system administrator tried to find some files (which are probably needed to be used as "CA Certificate"). He said that he does not know where this file is located on Ubuntu (he support only Windows). So, probably this is direction I need to go. I need to find this file. But may be I am wrong. May be something else needs to be done. Could you pleas help me with that?

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