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• Audio and video streaming using Network Simulator in Linux

  - by Parth_90

  I am working on a project which is to show the simulation of streaming of audio and video data in wireless networks. I want to show the simulation that involves a base station, with few wireless stations. The base station should start sending data once it computes a certain value . On receiving the data, each wireless must begin communicating with the base station. I have gone through basic NS-2 tutorials from over here but I am not getting how to go about integrating it with my project. Can anyone tell me how to do it using NS2 or any other network simulator?

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• why do i get an SPF Softfail?

  - by johnlai2004

  I installed SPF on my LAMP server with postfix. But for some reason, I get this error Received-SPF: softfail (mta1070.mail.re4.yahoo.com: domain of transitioning [email protected] does not designate 1.1.1.1 as permitted sender) I have two questions: 1) how do I trouble shoot this error 2) I've been looking through my configuration files in an attempt to change [email protected] to [email protected] because anotherurl.com has the correct SPF TXT records. Where do i go to change this? I tried editing myhostname under /etc/postfix/main.cf, but it didn't do anything.

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• redundant/multi-site terminal server

  - by Adam

  Hi We have a Hyper-V cluster running 5 virtual terminal servers using HA. We need to be able make this system redundant and so if this site was to fail our users could log into the backup system at another location and access their data via the terminal servers. Any ideas? We were thinking of maybe using a NAS which replicated the data to the other location in real-time(pass-through disks)? and having a similar Hyper-V cluster setup in the backup location. However we would need to create the users in both location and create a virtual mirror without the data ie applications, directories, settings etc. Is this the best way to achieve this? We have read that using Hyper-v pass through disks is a big performance de-grade.

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• Beginners advice on Small business network disk(s)

  - by Rob

  We are having 10 PCs used by various user and presently use one network disk (a LaCie NAS) for all our data. Everything is Windows Vista and our collective IT hardware knowledge is minimal. This worked well generally. However, recently the disk freqently loses connection from the network (2-3 times per week) and the only way back seems to be the "turn it off and back on" trick. This obviously cant be any good for the disk. I understand that there are various more sophisticated ways of storing data and was wondering what people would recommend. One of the worries is obviously disk failure (either in part or as a whole) and the lack of continued availability due to network issues. I would guess that a disk which replicates data wouldnt work as a sole solution due to the network connection, but dont know what hardware (and/or software) would/could work in our case. In terms of size, we are looking at very small amounts, ie. less than 500 GB in total.

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• What does this WinImage Error Mean?

  - by Kryten

  Hi, I am using WinImage (version 8.0) on Windows XP SP3 to create a VHD File from my Hard Drive, however, everytime I try to, everytime it says: "I/O error in reading data on position 000000007cd40000:00010000. Error 23: Data Error (cyclic redundancy check)." with the options "Abort", "Retry", "Skip" & "Skip All". Everytime I try "Retry" the message comes, if I click skip another message comes up (same as above, except the data position). I have run "CHKDSK /F /R" several times, but the error always appears. What is wrong? Can I safely skip the Errors? Is there anything I can do to fix the error?

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• why udp client work when wirshark capture?

  - by herzl shemuelian

  I have two machine A,B windows 7 os .I connect them end to end and try run a performance test by using tcpreplay. step 1) I check conectivity between to point by netcat In A i run nc -lvup 5432 when I run on B nc -u 1.2.3.4 5432 I can send data from B to A step 2) when in I run tcpreplay in B tcpreplay -i %0 myudp.pcap in A I don't recevice any data . when I open wireshark in A then my nc can read data why? I check dst mac and dst ip in pcap file they are correct. is importan udp src mac or src ip for udp how that I open udp server ?

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• Solution to time shifting requirement in Active Directory

  - by MikeR

  Hi, I currently have an active directory that has several child domains (consisting of nothing other than a DC and bespoke application servers) set-up for testing our CRM software, as some of it is date/time sensitive these have been set to dates in the future at some point in the past, which is causing replication errors. I'm working on getting rid of these child domains, but still have a requirement for our testers to be able to time shift. Does anyone know of any solutions that would allow our test environments to have their time changed (always forward), without affecting the production active directory? Is it as simple as creating a separate Forest on the same LAN or would that interfere with my production Forest? Thanks for any advice.

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• Can someone correct me about Windows 2008 DFS implementation

  - by cwheeler33

  I have 2 two Windows 2003 file servers using DoubleTake at the moment. They are in an 2003 AD domain. And each server has it's own disk set. It is time to replace the servers... I want to use Windows 2008 64bit Ent. I was thinking of using DFS-R to replace DoubleTake. The part I'm not sure about is clustering. Do I need to have shared storage if each server has a copy of the data? I want to have the data available to the same share name, so maybe I don't fully understand how DFS is set up. I currently have about 6TB of data. I expect to grow by 3TB a year on these file servers. Any resources/books that could teach me would be good to know as well.

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• Snow Leopard, PHP, and MySQL

  - by Peter

  I have just installed Snow Leopard and now my PHP/MySQL program ends in a "Segmentation fault". I have been searching the web for a solution, I realize that there are some issues with SL/PHP/MySQL, but I have not found anything that works yet. I downloaded the binary MySQL package mysql-5.1.42-osx10.6-x86_64. I have updated the php.ini file as suggested at various posts. When I run PHP and connect to the MySQL server the behavior is a bit random. In many cases it works fine to connect and read data. In my specific case the PHP program constructs a LOAD DATA LOCAL INFILE ... statement to load data from a text file. It should do several such queries after each other in a loop. It works one time but the halts in a "Segmentation fault". The program worked fine in Leopard, but not now. My versions are: OS 10.6.2, PHP 5.3.0, MySQL 5.1.42

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• Can I upgrade a Windows 2000 domain to 2008 and demote the 2000 server without clients attached?

  - by techie007

  Hi all, We're planning to replace a Windows 2000 domain controller with a new 2008 DC (new hardware). We've elected to take the route of getting the 2000 domain schema up-to-snuff, join the 2008 server, upgrade it to a DC, and after replication demote the 2000 server (eventually to be taken off-line). The goal being to not have to visit all the workstations, and limited domain down-time. :) We want bring the old server here and do all the backups, Domain prep, migration and role transfers here, and then (hopefully) just plop the new 2008 back in place after it's done, and join the 2000 server back as a member server (so we can then do folder migrations, etc.). Can this server work be done off-site, without the workstations attached? If we do this will anything need to be done to the clients, once the new DC is physically in place, so they contact the new 2008 DC; or will they just 'know' and continue on using the existing domain settings/user profiles, etc.? Thanks in advance! :)

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• Excel graph: turn stacked bar chart into part bullet chart

  - by Mike

  I've a simple data file that has one column of actuals and another of target against categories. I would like to turn the TARGET figure into a 'Bullet marker'. I've seen it done on other graphs but I'm struggling with the category column being overwritten with the xy axis values. Or if I get close to doing it then the xy markers are not central. I've checked out Peltier but his examples are based on even more comlicated data than mine, so the steps required didn't seem to match up. Help greatly appreciated. Thanks Mike. Example Data: Cat Actual target A 10 15 B 10 12 C 20 17

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• Convert Public Folders to a PST

  - by TrueDuality

  Alrighty so I've got a tricky one. I currently have a public folder database (edb & stm) residing on an Exchange 2003 folder. I need to export them into a pst file or otherwise make it so that I can manually get the data in it to end-users. I can not use the export feature built into Outlook as some of the folder refer to another server which doen't have the data. Trying only results in the Outlook Client hanging for close to an hour before giving an error about not finding the data. So this will need to be a server side export. There are a few tools out there that seem to be available for converting edb & stm files to psts but they are quite expensive. Does anybody have any ideas?

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• Is Family Tree Maker 2011 the right upgrade?

  - by bill weaver

  My father has used Family Tree Maker for years, but hasn't upgraded since version 11. It is difficult to tell from reviews at Amazon and other places whether upgrading to FTM 2011 is a good choice. File incompatibilities and upgrade woes sound like customer service is lacking, and i've read reports of it uploading your data to their database but then trying to sell you a download of data. Looking at the ancestry.com site makes me think it's solely about selling add-ons and upgrades. On the other hand, the feature set seems fairly rich and the software has a pretty strong following. I was able to get Gramps working on my system, but that's not going to work for my dad. Any advice on a good upgrade path? Doesn't necessarily have to be FTM. The only requirement is a way to import his existing data.

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• *.example.com wildcard domain can be parsed from a single page?

  - by Sean Kean

  For a domain 'example.com' - what is the easiest way to set up a wildcard dns (*.example.com), hosting, and htaccess/httpd.conf/virtualhost, and script on a page so that: how.do.i.setup.a.site.with.wildcards.like.this.example.com or anything.that.is.given.as.a.subdomain.for.example.com is rendered by a page at example.com/index.html - yet keeps the wildcard subdomain in the URL bar and passes the full URL as a parameter for rendering tags in HTML? An example tag is a Facebook comment: { div class="fb-comments" data-href="http://how.do.i.setup.a.site.with.wildcards.like.this.example.com" data-num-posts="2" data-width="500" } I just opened a hosting account with spry.com and have a VPS running Ubuntu 11.04-x86-LAMP - Essentially, what is the most straightforward way of doing this? Thanks so much. (I originally posted this over on stackoverflow but realize its more of a serverfault question)

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• Concurrent modification during backup: rsync vs dump vs tar vs ?

  - by pehrs

  I have a Linux log server where multiple applications write data. Data is written in bursts, and in a lot of different files. I need to make a backup of this mess, preferably preserving as much coherence between the file versions as possible and avoiding getting truncated files. Total amount of data on the server is about 100Gb. What I really would want (but can't) is to shut-down, backup the system cold and then start it up again. What kind of guarantees against concurrent modification does the various backup tools give? When do they "freeze" the file versions? I am looking at rsync, dump and tar at the moment, but I am open for other (open source) alternatives. Changing the application or blocking writing for backups is sadly not an option. System is not running LVM (yet), but I have considered that for rebuilding the system and then snapshots.

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• Appropriate Network switch for small server cluster

  - by Chris Dutrow

  Need to build a small business server cluster for the purpose of crunching data. It will not host a web site that needs to be available 24/7. It does need to support servers that host Redis, a Cassandra database cluster, and a Python web server. Operating system will most likely be Centos 6.4 Other servers in the cluster should be able to communicate very fast with each other, especially the Redis server. This will probably require the use of internal IP addresses. We will need to use multi-data center replication to synchronize the Cassandra cluster with the one that we currently have hosted on the cloud Was looking into network switches and we are unsure of the appropriate specifications that we should be looking for. Does the switch need to be "managed" or can it be "unmanged"? Does the switch need to support IPv6 or just IPv4? Do we need an enterprise level Cisco switch, or can we go with something like a $200 DLink managed (or unmanaged) small business switch? Thanks so much!

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• As a small business about to overhaul infrastructure and go virtual, how can we take advantage of all the features of the QNAP TS-439 Pro II+?

  - by Sally

  Specifically, how can we benefit from these current list of features? We're very new to this and I want to be able to talk intelligently to our IT consultant. VMware Ready Citrix Ready Built-in iSCSI target service Virtual Disk Drive (via iSCSI Initiator) Remote Replication Multi-LUN per Target LUN Mapping & LUN Masking Support SPC-3 Persistent Reservation Support What other products should we compare this QNAP to? I appreciate how informative the site is, but they only seem to sell their products through a small number of channels. Is QNAP well known? TIA!

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• Is there an encrypted write-only file system for Linux?

  - by Grumbel

  I am searching for an encrypted filesystem for Linux that can be mounted in a write-only mode, by that I mean you should be able to mount it without supplying a password, yet still be able to write/append files, but neither should you be able to read the files you have written nor read the files already on the filesystem. Access to the files should only be given when the filesystem is mounted via the password. The purpose of this is to write log files or similar data that is only written, but never modified, without having the files themselves be exposed. File permissions don't help here as I want the data to be inaccessible even when the system is fully compromised. Does such a thing exist on Linux? Or if not, what would be the best alternative to create encrypted log files? My current workaround consists of simply piping the data through gpg --encrypt, which works, but is very cumbersome, as you can't easily get access to the filesystem as a whole, you have to pipe each file through gpg --decrypt manually.

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• List/remove files, with filenames containing string that's "more than a month ago"?

  - by Martin Tóth

  I store some data in files which follow this naming convention: /interesting/data/filename-YYYY-MM-DD-HH-MM How do I look for the ones with date in file name < now - 1 month and delete them? Files may have changed since they were created, so searching according to last modification date is not good. What I'm doing now, is filter-ing them in python: prefix = '/interesting/data/filename-' import commands names = commands.getoutput('ls {0}*'.format(prefix)).splitlines() from datetime import datetime, timedelta all_files = map(lambda name: { 'name': name, 'date': datetime.strptime(name, '{0}%Y-%m-%d-%H-%M'.format(prefix)) }, names) month = datetime.now() - timedelta(days = 30) to_delete = filter(lambda item: item['date'] < month, all_files) import os map(os.remove, to_delete) Is there a (oneliner) bash solution for this?

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• Speed up file access on home network

  - by kurasa

  I have 2 PCs (Windows 7 Ultimate) and a Mac running Windows 7 using vmware fusion on my home network tied together using WRN1000 NETGEAR Router On one of the PC's I have a set of file (MYOB .myo). These use a data source to access the data in the files. Operations (reading,writing) to the .myo on the PC which hosts the files is fine but the other 2 it is painfully slow/unreliable and I am wondering what I can do to speed this up. Some ideas I have are 1. Turn off the Windows firewall on all the windows installations on the home network 2. Buy another router. Specifically a router which I can connect a USB flash drive on the back where I can put the .myo files and all the PC can access the files from the USB flash drive on the router (does this speed things up?) Any advice greatly appreciated on how I can speed up this access to data

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• USB Flash drive corrupt files - Help needed

  - by Michael

  I have a 16gb usb flash drive with 8gb worth of data that I can't afford to lose. When I inserted it into my pc, inside the folder that I was storing the data I saw unintelligible characters and nothing in there would open. I ran, windows scandisk and the files (unfortunately) disappeared. I can see that the drive's space still appears to be taken up with data, about 8gb. What should I do to recover it? Is it possible? Thanks in advance... Michael

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• What are best monitoring tool customizable for cluster / distributed system?

  - by Adil

  I am working on a system having multiple servers. I am interested in monitoring some server specific data like CPU/memory usage, disk/filesystem usage, network traffic, system load etc. and some other my process specific data. What are available open source that can serve my purpose? If it provides to customize the parameter to be monitored and monitor your own data by creating plugin / agent. Any suggestions? I heard of Nagios, Zabbix and Pandora but not sure if they provide such interface.

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• Best practice for scaling a single application source to multiple nodes

  - by Andrew Waters

  I have an application which needs to scale horizontally to cover web and service nodes (at the moment they're all on one) but interact with the same set of databases and source files (both application code and custom assets). Database is no problem, it's handled already with replication in MongoDB. Also, the configuration of the servers are the same (100% linux). This question is literally about sharing a filesystem between machines so that its content is always correct, regardless of the node accessing it. My two thoughts have so far been NFS and SAN - SAN being prohibitively expensive and NFS seeing some performance issues on the second node with regards to glob()ing in PHP. Does anyone have recommended strategies or other techniques that don't involved sharding data across nodes or any potential gotchas in NFS that may cause slow disk seek times? To give you an idea of the scale, the main node initialises it's application modules in ~ 0.01 seconds. The secondary is taking ~2.2 seconds. They're VM's inside a local virtual network in ESXi and ping time between them is ~0.3ms

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• Linux Live CD for old computer

  - by Joel Coehoorn

  I have a pentium II (that's right, pentium II) with a scant 200MB of ram. This was a high-end workstation in it's day. The machine currently runs dos on a raid array, and I need to pull some data from it. I figure my best chance at this is to use a linux live cd to copy the data to one of our active directory network shares (there is a network card in the machine). Unfortunately, my linux skills are abysmal, so I'm not sure where to get started: Where should I look to find a linux cd that will run well on such an old system Since I'm likely gonna need to be command-line only, what do I need to do to configure the network card and mount the network share via the command line? Bonus points: exact syntax needed to copy and convert the entire volume for use in VMware server 2.0, but really just copying all the data should be enough.

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• How do you passthrough native SATA drives to a guest on ESXi?

  - by John

  I have ESXi 4.0 running on an Intel DX58S0 Mothboardboard with an Intel Core i7 930 processor. VT-d is also enabled. I have three drives in the system, drive 0 is used for ESXi. Drive 1 and 2 contain data from an older machine and show up under the "Storage Adapters" section in configuration. I would like to allow a guest machine to access the data on these drives (as nativly as possible). I have enabled passthrough of the motherboard's built in SATA controller (Intel/Marvell 88SE6121 ). This controller shows up in my guest OS, but the guest shows no drives aside from the normal virtual drive. I have tried a Linux guest and Windows7. I have also configured the host machine to try IDE/RAID/ACHI modes for the SATA controller. Any ideas how I can configure one of my guests to get at the raw data on these drives?

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