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• Two subnets on one switch with no VLAN and possible problems

  - by casey_miller

  As far as I know in order to use two subnets on one physical cable VLAN's are recommended. However, is it possible to achieve this (i.e: two subnets on one physical network) like 192.168.1.0/24 and 10.0.0.0/8 networks. What kind of problems or hidden rocks this way contains? With VLAN's it's possible to better isolate so users wouldn't easly sniff the other network. But in my environment it's okay if user on one subnet could listen to the traffic on another network. Is it the only problem?

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• Free Google Docs alternative compatible with Opera

  - by f4k3

  Well gDocs isn't working ok, too many bugs and it's pretty slow (especially when saving documents). I have tried several alternatives: - Zoho - they say it's not compatible with Opera and it;s true - you even can't CTRL+V text - Buzzword - it's really slow, and some functions don't work properly (on all browsers) for example "increase indent" increases a random text indent - Etherpad - was taken over by google and is shut down - Peepel - it's a cool thing, almost a free virtual desktop in a browser but it's buggy - a saved a document, tried to open it end an error occured. the document was lost - OpenGoo - went commercial At the moment I'm testing ThinkFree Online - it'a a bit slow (Java :P) and some minor things don't work (like drag a toolbar) but it has cool functionalities (almost like OpenOffice! which I use at home), it actually works with opera (create, save, edit document). Maybe I'll try Scribd but is it a office/share platform? any other worth trying??

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• Can't find netbooted for Kerrighed pxe boot with Ubuntu Lucid Server

  - by Pengin

  I'm following installation guides for pxe booting and kerrighed. I can't find the package nfsbooted for Ubuntu 10.04. Where did it go? Context: At work I have access to 8 mini-ITX PCs and am trying to build a cluster. My plans include trying Condor, GridGain, Hadoop, and recently Kerrighed has caught my eye. (I reaslise these are all for different kinds of things, I'm just evaluating). Ideally, I'd like to have all the nodes network boot from a single server, since that seems so much easier to manage, plus I can 'borrow' additional PCs for a while without touching their HD. I've been getting on great with Ubuntu Lucid Server (10.04), trying to follow the only guides I can find to get pxe booting (and ultimately kerrighed) to work. This guide is for Ubuntu 8.04 and this one is for Debian. They both refer to a package I can't seem to find, nfsbooted. Has this package been replaced? Am I doing something daft?

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• ZFS and SAN -- best practices?

  - by chris

  Most discussions of ZFS suggest that the hardware RAID be turned off and that ZFS should directly talk to the disks and manage the RAID on the host (instead of the RAID controller). This makes sense on a computer with 2-16 or even more local disks, but what about in an environment with a large SAN? For example, the enterprise I work for has what I would consider to be a modest sized SAN with 2 full racks of disks, which is something like 400 spindles. I've seen SAN shelves that are way more dense than ours, and SAN deployments way larger than ours. Do people expose 100 disks directly to big ZFS servers? 300 disks? 3000 disks? Do the SAN management tools facilitate automated management of this sort of thing?

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• How to add/remove codecs in linux

  - by agg

  Friends, I'm new to Linux, I need to work on Linux. I have ported Linux to AT91SAM9261-EK board. Now i need to work on Codecs. I just know the definition of codec from wikipedia, Now i need add my own codec to the board. I want to know, Where codec will be preset in 1)File System, 2)Kernel or 3)Player And how to add codec while building entire source, please tell me the steps i need follow. And also how to remove the codec. How to play the video files from pendrive in console, now i can play audio by command 'mplayer "filename" '. Don't know how to play video. Please help me, How to do this. Regards AGG

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• How to make ssh/rsync/etc use a VLAN network interface?

  - by Annan

  A company I work for has a number of virtual servers with ElasticHosts. They are setup in such a way that eth1 is on a private VLAN connecting them to each other. This is so backups sent between servers are not charged at the same rate as external data transfer. My understanding of how VLANs and network interfaces work is sketchy at best. How can I make ssh, rsync, etc. transfer data through the VLAN? My final solution: I spent a while trying to figure this out, For all servers involved, edit /etc/sysconfig/network-scripts/ifcfg-eth1 DEVICE=eth1 BOOTPROTO=static ONBOOT=yes HWADDR=YOUR_MAC_ADDR IPADDR=192.168.0.100 NETMASK=255.255.255.0 Where HWADDR should already be set and the last octate of IPADDR should be different from each other. Then run, on all servers /etc/init.d/network restart After this the IP addresses specified by IPADDR can be used directly as any other IP address.

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• FTP error 424 failed to establish connection

  - by cKK

  Getting "ftp error 425 failed to establish connection" when trying to connect to ftp server. Tried 2 ftp clients on 3 machines on same network and none work. However FTP works from home / mobile broadband. No ip blocks on ftp sever. Other ftp servers(differrent ip/hosts) work okay. firewall setup correct, no ports blocked. Is it possible to use a proxy for ftp a i think it's something with the ISP but taking too long to fix?

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• Accessing localhost via IIS 7.5 on Windows 7 very slow

  - by Ian Devlin

  (I've asked this over on stackoverflow already, but thought I'd ask here as well) I'm currently running an ASP.NET application on IIS 7.5 on Windows 7. When I access this application on Internet Explorer (either 6, 7 or 8) it is incredible slow and often fails to load at all. There are messages at the bottom saying: Waiting for http://localhost/....... or sometimes waiting for about:blank (I've read that this can be a virus, but I've run all the usual checks and it's not). constantly, but it returns with the usual: "Internet Explorer cannot display the webpage" I've also tried this by using 127.0.0.1 and the machine name, with the same results. I've tried the same application on the latest Firefox, Safari, Chrome and Opera and they all work fine. I've also installed the same application on a Windows Server 2003 machine, and it all works fine via Internet Explorer. I've also turned off the IPv6 setting on the LAN connection. Soes anyone have any ideas why this doesn't work with Internet Explorer and yet does with other browsers?

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• Using WebSphere CloudBurst with PowerVM to AIX virtualization over a cloud

  - by ADD Geek

  hi there we are studying the virtualization option to reduce our datacenter cost, and this research was assigned to me. we looked into alternatives and we almost reached a conclusion that PowerVM is the only option to virtualize pSeries servers. we found no signs of cloud support explicitly mentioned in any document, however there was the mention of CloudBurst. from the videos we watched and the documents we read, it seems that CloudBurst is more oriented towards Application Servers (WebSphere Software). but our environment is not relying only on WebSphere. we have some banking applications, Oracle Databases and MQ/Broaker. the question is: 1- can we virtualize the existing applications (all running AIX) on a cloud running on top of some of the existing servers? (given that we do the sizing properly) 2- is PowerVM to run on top of CloudBurst? 3- if the above solution is applicable, is this some sort of HA solution (since the VM will run on top of multiple physical boxes, while the same physical box will run multiple live images) thanks for your help

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• How do I connect via FTP to XAMPP?

  - by Doug

  Can I use WinSCP to connect to xampp? How does this work?

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• Why does Windows 7 need hardware virtualization to run XP mode?

  - by Ken Pespisa

  I have a MacBook Pro and I've run VMware Fusion's unity mode and Parallels' cohesion mode along side the Mac OS X, and both work pretty seamlessly. I figured XP Mode in Windows 7 would be something similar, but I then learned my machine requires hardware virtualization support, which it does not have. My machine is an HP dc7800. That's a dual core 2.2GHz machine with 4GBs of RAM. Certainly it has the horsepower to run a virtual environment alongside the primary OS. I'm wondering: 1) Why Microsoft decided to make hardware virtualization a requirement and 2) What am I missing? Is the experience similar to Parallel's cohesion mode / Fusion's unity mode? Thanks!

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• Cannot import video from a DV camcorder over FireWire

  - by qbeuek

  I have a JVC GR-D320 miniDV camcorder that has a FireWire interface. I recently upgraded to Windows 7 RTM (64 bit, fresh installation). When I connect my camcorder through FireWire, I can see it in Device Manager without any warnings or problems, but I cannot capture videos from my miniDV tapes. After connecting, AutoPlay displays "Import Video could not find a compatible digital video device. Verify that the digital video device is properly connected and turned on." When using Windows Live Photo Gallery after selecting the import option, my camera is not listed. The camera used to work perfectly on the same hardware before upgrading to Windows 7 RTM 64 bit (it used to work fine on Windows XP SP3 32 bit). Googleing revealed that people had the exact same problems in Vista, but no solution was provided. Any help?

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• Cannot run java as regular linux user.

  - by Roger

  I am having problems trying to run java as a normal user on linux. It runs fine as root user but not as a regular user. Any help would be apreciated. Thanks root@pro1 [~]# which java /usr/local/jdk/bin/java root@pro1 [~]# java -version java version "1.6.0_22" Java(TM) SE Runtime Environment (build 1.6.0_22-b04) Java HotSpot(TM) 64-Bit Server VM (build 17.1-b03, mixed mode) root@pro1 [~]# su istream istream@xxxxxxxxx [/root]# which java /usr/local/jdk/bin/java istream@xxxxxxxxx [/root]# java -version Error occurred during initialization of VM Could not reserve enough space for object heap Could not create the Java virtual machine. istream@xxxxxxxxx [/root]#

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• Improving server security [closed]

  - by Vicenç Gascó

  I've been developing webapps for a while ... and I always had a sysadmin which made the environment perfect to run my apps with no worries. But now I am starting a project on myself, and I need to set up a server, knowing near to nothing about it. All I need to do is just have a Linux, with a webserver (I usually used Apache), PHP and MySQL. I'll also need SSH, SSL to run https:// and FTP to transfer files. I know how to install almost everything (need advice about SSL) with Ubuntu Server, but I am concerned about the security topic ... say: firewall, open/closed ports, php security, etc ... Where can I found a good guide covering this topics? Everything else in the server... I don't need it, and I wanna know how to remove it, to avoid resources consumption. Final note: I'll be running the webapp at amazon-ec2 or rackspace cloud servers. Thanks in advance!!

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• Create Virtual Image of Laptop before Formatting

  - by Simon Mark Smith

  I have a 3 year old laptop running Windows XP that I used for business. Although I have not used the laptop in over a year, I now want to re-commission it with Windows 7 and a fresh install. Before I do the fresh install I want to create a Virtual Image of the laptop that I can keep and potentially run on my desktop machine should I ever need to access any of the old files/projects that it contains currently. I know that most people will say just copy the files over to your desktop, but my concern is the configuration of the laptop. I used to use it for development and it has older versions of Visual Studio, SQL Server, Active X controls etc, etc than I currently use so I really want to preserve the environment not just the files. So really I am asking what is the best tool-set/method to achieve this? I understand there are free VM tools available but I have never done this before and would appreciate any help.

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• Bacula vs. BackupPC [closed]

  - by ujjain

  I have been googling about the differences between them. Bacula has lots of roles BackupPC is easier to configure Bacula works with agent, not rsync (great for Windows backups) It seems that Bacula is most often compared to Amanda though, while BackupPC seems a perfectly lovely and popular backup distribution to. I currently backup my servers with rsnapshot, but I am looking for a professional scalable solution that could also back-up 50 hosts without problems. Preferably a solution that can offer bare metal restores for my Linux servers. I am not looking to reinstall the exact same version of Plesk, the software, etc... Update: I see this ranks high in Google, I found a good article: http://www.serverfocus.org/backuppc-vs-bacula-vs-amanda. I personally think that BackupPC is good for smaller environment, but Bacula, despite the high learning curve, is better for environments that requilre scaling.

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• XP shared folders not accessible after BIOS changed

  - by stijn

  Here's what worked for over a year: PC A runs Windows 7, PC B runs Windows XP. Both are on the same subnet behind a router. A uses user account X, but logs in to PC B using the Administrator account. PC B is a Dell Precision 470. A known problem with these is that sometimes when plugging in their power cable they somehow loses all BIOS settings. This happened yesterday. After this happens Windows won't boot, because the default BIOS setting is 'RAID ON' while there is no RAID configured. No problem though, changing the BIOS settings to 'RAID OFF' makes it boot without problems. Note that in the meantime, nothing config-related was changed on machine A. It wasn't even on. Indeed after doing this, everything is fine. Everything includes all normal operations, remote desktop from PC A to PC B, running Synergy between A and B, accessing shared folders from B to A. But accessing the shared folders on B from A does not work any more. I tried pretty much everything I found via Google (fiddling with policies/registry kes/...) but no avail. > ping -a 192.168.2.2 Pinging A [192.168.2.2] with 32 bytes of data: Reply from 192.168.2.2: bytes=32 time<1ms TTL=128 > net view \\192.168.2.2 System error 5 has occurred. Access is denied. > net use /persistent:no K: \\A\myshare /user:A\USERNAME PASSWORD > net use /persistent:no K: \\192.168.2.2\myshare /user:192.168.2.2\USERNAME PASSWORD > net use /persistent:no K: \\192.168.2.2\myshare /user:USERNAME PASSWORD System error 86 has occurred. The specified network password is not correct. A solution to this would be great: I haven't been able to do any work since yesterday ;] update after taking the hard drive out of B and putting it in another Precision 470 with almost exactly the same hardware (at first sight, only the video card differs) the shared folders work.. Putting the disk back into A, same problem remains. Why does this depend on hardware, and more important, on which hardware?

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• Ubuntu 11.04 and OpenLDAP - where is the config?

  - by Tom SKelley

  I've been asked to setup a multimaster LDAP environment on Ubuntu 11.04 - instead of a single master server. I cloned the master server and recreated it into two VMs. I am trying to follow the instructions on the OpenLDAP documentation here: http://www.openldap.org/doc/admin24/replication.html and it talks about modifying the cn=config tree within LDAP. The subdirectory tree appears to be there at: /etc/ldap/slapd.d/ and a slapcat -b cn=config drops out a load of config information. When I try to connect using a browser and the admin bind credentials: ldapsearch -D '<adminDN>' -w <password> -b 'cn=config' I get: # extended LDIF # # LDAPv3 # base <> (default) with scope subtree # filter: (objectclass=*) # requesting: ALL # # search result search: 2 result: 32 No such object I don't see the config context when I connect via an LDAP browser either. I'm sure I'm missing something, but I can't see what it is!

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• Virtualization deployment for datacenter

  - by bogha

  Hi, my company is going to deploy an IT Infrastructure on a virtual platform, can you please help me with the following: 1- which one do you recommend, Cisco Unified computing system ( cisco + emc + vmware )or HP Blades( virtualization solution + HP Storage )? 2- i Need to install a DNS Server, Web server, cpanel for managing hosting packages and Microsoft layer of product for usingg in the corporate infrastructur ( active directory, Local DNS, Exchange server, DHCP, Global catalog ) what is the minimum requirments for these servers ( in terms of CPU and Memory ) . 3- what is the best way to implement a redundant solution in a virtual environment. thank you

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• Keyboard layout for mathematical/Greek symbols

  - by David

  I've been wondering about this for a long time but never thought to ask: I do a lot of scientific work so there are many times it would be really handy to be able to type mathematical symbols or Greek letters which, for the most part, aren't part of the ASCII character set. Like "8 µ ? s t ? ? … v ? = = ±" and so on. Is there a keyboard layout (for Linux) that maps simple key combinations to these kinds of characters? (Assuming all the encoding and font issues are worked out properly) I know I could create one myself but it'd be a lot easier if someone's already done the work, or at least if there's a partial solution I could modify.

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• Squid/Kerberos authentication with only Linux

  - by user28362

  Hi, I would like to know if it possible to let a Windows Xp machine authenticate to Squid (Linux) using Kerberos without the need of an Active Directory domain. I only want to create a Kerberos ticket on the client side, which should give the client access to squid (using I.E.). I only found tutorials about configuring A.D./Squid, not an environment with only Linux servers. Thanks Update: The kerberos setup is correctly done, the proxy and client can get tickets. As for the browser (FF/IE), I get: ERROR Cache Access Denied While trying to retrieve the URL: http://www.google.com/ The following error was encountered: * Cache Access Denied. Sorry, you are not currently allowed to request: http://www.google.com/ from this cache until you have authenticated yourself. In kerberos, I get: squid_kerb_auth: Got 'YR ElRNTVMTUABBAABAB4IIogAAAAAAAAAAAAAAAAAAAAAFASgDAAAADw==' from squid (length: 59). squid_kerb_auth: parseNegTokenInit failed with rc=101 squid_kerb_auth: received type 1 NTLM token This message is strange, as I didn't configure NTLM. It looks like the browser uses the wrong authentication methode.

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• Configure TCP/IP to use DHCP and a Static IP Address at the Same Time

  - by Tiago

  My computer is configured to obtain a IP address automatically using DHCP. It only has one network adapter. How to configure an additional static IP address? I found a tutorial for Windows XP, but the procedure didn't work for Windows 7. Is it possible to configure two IP addresses on Windows 7, one being static e another being dynamic? How? The dynamic address I got now is 10.17.11.162. The static IP is 10.17.30.19. The network mask is the same: 255.255.224.0. Both work independently, but I don't know how to use both at the same time.

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• Better to develop Ruby project on server or buy a faster desktop computer? B/c laptop too slow.

  - by user33184

  I have a Linux laptop (Vostro V13) running a Celeron M chip. This is a fine laptop, but running unit tests especially for Rails applications is slow. I want a faster development environment but I don't want to spend too much money. So the choice I have is between $390 for a Linux desktop machine with a Pentium Dual Core Processor E5400 and just paying between $30 and $40 a month to Linode and trying to do development remotely on that server. Can anyone with experience developing server applications using both methods offer any advice?

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• Apache 2.4.2 with PHP 5.4.4 crashes as soon as phpinfo() script is opened

  - by Gremo

  As soon as i open a phpinfo() script called version.php apache stops working. Here is the error.log file. My configuration (my local development machine): Windows 7 Home Premium x64 SP1 with latest updates Apache 2.4.2 win32 from Apache Lounge PHP 5.4.4 VC9 x86 TS from PHP For Windows php5apache2_4.dll (PHP 5.4.4) taken from Apache Lounge php5apache2_4.dll-php-5.4-win32.zip PATH environment variable is PATH=C:\WAMP\Apache\bin;C:\WAMP\PHP and installation folders (unzipping) are: C:/WAMP/Apache C:/WAMP/PHP Microsoft Visual C++ 2010 SP1 x86/x64 installed and updated. So everything looks fine to me. PHP integration in httpd.conf is: # Integrazione PHP LoadModule php5_module "C:/WAMP/PHP/php5apache2_4.dll" PhpIniDir "C:/WAMP/PHP" AddType application/x-httpd-php .php <IfModule dir_module> DirectoryIndex index.html index.php </IfModule>

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• What is the correct cipher name for RC4 in Chrome?

  - by qbi

  I want to remove RC4 from Google Chrome and found the commandline option --cipher-suite-blacklist. However I wasn't able to figure out what the correct notation for RC4 is. Whatever I tried so far only brought the message: ERROR:ssl_config_service_manager_pref.cc(55)] Ignoring unrecognized or \ unparsable cipher suite: Even the names listed in ssl_cipher_suite_names.cc don't work. What should I enter to remove RC4 as a cipher for SSL/TLS? I'm working with some different versions of GNU/Linux and sometimes also with Windows. So it would be nice if the command-line argument would work under all OSes. I used the following command: chrome --cipher-suite-blacklist=TLS_RSA_WITH_RC4_128_MD5 --ssl-version-min=tls1.1 chrome --cipher-suite-blacklist=RC4 --ssl-version-min=tls1.1 chrome --cipher-suite-blacklist=0xXYZ,0xUVW --ssl-version-min=tls1.1 # XYZ and UVW are some hexadecimal numbers

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