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  • need help upgrading small business wifi network

    - by Henry Jackson
    Our small business currently has 3 wireless access points around the building, each with their own SSID. Security is done with WEP (ick) and MAC address filtering (double ick). We are trying to reconfigure the setup, with these goals: wifi roaming between the access points user-based authentication that isn't as annoying as MAC address filtering. 1) The entire building is hardwired with ethernet, so I assume it should be easy to set up the routers to act as one big network, but I can't figure out how. Can someone point me in the right direction? The routers are consumer-grade linksys routers, is it possible to do this without getting new hardware? 2) For security, we will probably upgrade to WPA2, and I'm thinking of using the Enterprise version so that users can log in with a username, instead of having a single key (so if an employee leaves or something, their access can be removed). We have several on-site Windows servers, can one of them be set up as a RADIUS server, or is that best left to a dedicated machine (again, using existing hardware is good).

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  • need help upgrading small business wifi network

    - by Henry Jackson
    Our small business currently has 3 wireless access points around the building, each with their own SSID. Security is done with WEP (ick) and MAC address filtering (double ick). We are trying to reconfigure the setup, with these goals: wifi roaming between the access points user-based authentication that isn't as annoying as MAC address filtering. 1) The entire building is hardwired with ethernet, so I assume it should be easy to set up the routers to act as one big network, but I can't figure out how. Can someone point me in the right direction? The routers are consumer-grade linksys routers, is it possible to do this without getting new hardware? 2) For security, we will probably upgrade to WPA2, and I'm thinking of using the Enterprise version so that users can log in with a username, instead of having a single key (so if an employee leaves or something, their access can be removed). We have several on-site Windows servers, can one of them be set up as a RADIUS server, or is that best left to a dedicated machine (again, using existing hardware is good).

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  • Network monitoring solution

    - by Hellfrost
    Hello Serverfault ! I have a big distributed system I need to monitor. Background: My system is comprised of two servers, concentrating and controlling the system. Each server is connected to a set of devices (some custom kind of RF controllers, doesnt matter to my question), each device connects to a network switch, and eventually all devices talk to the servers, the protocol between the servers and the devices is UDP, usually the packets are very small, but there are really a LOT of packets. the network is also somewhat complex, and is deployed on a large area physically. i'll have 150-300 of these devices, each generating up to 100+ packets per second, and several network switches, perhaps on 2 different subnets. Question I'm looking for some solution that will allow me to monitor all this mess, how many packets are sent, where, how do they move through the network, bandwidth utilization, throughput, stuff like that. what would you recommend to achieve this? BTW Playing nice with windows is a requirement.

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  • Unable to Boot from USB External Hard Drive

    - by Josh Stodola
    I recently upgraded my main development machine to Windows 7. This involved wiping out my primary boot drive (Windows XP 64-bit) and starting clean. Before I wiped it, I did a direct disk-to-disk copy to a big external hard drive I have. While I have been able to migrate most of the necessary files without any problems, I was wanting to boot from it today to check a few settings. I plugged in the hard drive, rebooted, changed the BIOS to boot from USB-HDD first. But, no mattter what I do, it always boots from my primary drive to Windows 7. I do not see any kind of error message or anything. How can I boot to Windows XP 64-bit on this external hard drive?

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  • IIS site hacked with ww.robint.us malware

    - by sucuri
    A bunch of IIS sites got hacked with a javascript malware pointing to ww.robint.us/u.js. Google cache says more than 1,000,000 different pages got affected: http://www.google.com/#hl=en&source=hp&q=http%3A%2F%2Fww.robint.us%2Fu.js http://blog.sucuri.net/2010/06/mass-infection-of-iisasp-sites-robint-us.html My question is: Did anyone here got hacked with that and still have any logs (or network dump) available for analysis? If you do, have you spotted anything interesting in there? Sites as big as wsj.com got hacked and some people are saying that maybe a zero-day on IIS/ASP.net is in the wild...

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  • Solaris TCP/IP performance tuning

    - by Andy Faibishenko
    I am trying to tune a high message traffic system running on Solaris. The architecture is a large number (600) of clients which connect via TCP to a big Solaris server and then send/receive relatively small messages (.5 to 1K payload) at high rates. The goal is to minimize the latency of each message processed. I suspect that the TCP stack of the server is getting overwhelmed by all the traffic. What are some commands/metrics that I can use to confirm this, and in case this is true, what is the best way to alleviate this bottleneck? PS I posted this on StackOverflow originally. One person suggested snoop and dtrace. dtrace seems pretty general - are there any additional pointers on how to use it to diagnose TCP issues?

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  • Change popup format for Kopete in Gnome (Ubuntu 10.04)

    - by HorusKol
    After trialling Empathy which was included with Gnome/Ubuntu 10.04 I decided to go back to Kopete since I was losing chat messages. However, for some reason, Kopete is now displaying all popups in a big, ugly window with four options (ok, cancel, view, ignore, or something like that) that actually all seem to do nothing. I tried looking for options in Kopete to change the popup style to the nicer Gnome style one which goes up in the top-right of my desktop, but it doesn't seem to be possible with this release. So I had to resort to removing all popup messages from Kopete to prevent my screen being taking over by a popup requiring action for every incoming chat message. Unfortunately, this now means that I do not get any notifications when people message me - and so I can go a couple of hours without realising that they did. Anyone know how to get the nice, unobtrusive popups working in this version?

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  • Change popup format for Kopete in Gnome (Ubuntu 10.04)

    - by HorusKol
    After trialling Empathy which was included with Gnome/Ubuntu 10.04 I decided to go back to Kopete since I was losing chat messages. However, for some reason, Kopete is now displaying all popups in a big, ugly window with four options (ok, cancel, view, ignore, or something like that) that actually all seem to do nothing. I tried looking for options in Kopete to change the popup style to the nicer Gnome style one which goes up in the top-right of my desktop, but it doesn't seem to be possible with this release. So I had to resort to removing all popup messages from Kopete to prevent my screen being taking over by a popup requiring action for every incoming chat message. Unfortunately, this now means that I do not get any notifications when people message me - and so I can go a couple of hours without realising that they did. Anyone know how to get the nice, unobtrusive popups working in this version?

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  • In Excel, given a worksheet "A", how do you create a sheet "B" that has a subset of the rows in "A"?

    - by user32706
    In Excel 2007, I have a sheet full of data "A". One of the columns in sheet "B" is called "Valid" and has either "yes" or "no". I've created a second sheet "B". It's easy to make each row in "A" appear in "B" if the row is valid using an 'if' statement in each cell. But if it's invalid, there's a blank row. I need "B" to show only the rows from "A" that are valid. TWO BIG CAVEATS: - No macros - No filtering (for long and complicated reasons). I feel like it might be possible with vlookup used cleverly, but so far, I'm stumped.

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  • Mac OS X Finder - Creating New Folder with Right-Click in List View

    - by JT.WK
    I am aware that when using Finder in List view, I can create a new folder by right-clicking on an empty row, and pressing 'New Folder'. However, when I happen to be browsing a folder with quite a lot of files (or just enough to invoke a scrollbar), there are no blank rows, and hence nowhere that I can right-click to create a new folder. This is not a big problem, I am just a whinger who likes consistency and find this frustrating. Yes, I am aware that I can press Shift + Cmd + N, or can simply change the Finder view. BUT, is there a way to do this within list view? Am I missing something obvious? Edit: oh, and I'm using Snow Leopard (version 10.6) :)

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  • Add 802.11n to existing 802.11g environment

    - by Andrew Robinson
    I have a small home network that is currently running 802.11g. Two computers that are capable of 802.11n and two devices (a BlackBerry and a Skype phone) that are limited to 802.11g. I have a few neighbors running 802.11g but their signals are very weak. How big an impact will the two G devices have on N speeds? Will they pull the whole network back down to G? These two devices are hardly ever used where as the other N devices are heavily used. If I add an N router to the network (instead of replacing the G) and set my existing G router to use channel 1 with 20MHz bandwidth and then set the N router to use 6 & 11 for 40MHz will I eliminate the overlap and allow for full speed on both networks?

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  • How to erase a SSD to restore factory performance in Linux?

    - by Andy B
    Due to big performance issues with an mdraid-1 array I'd like to pull down from the array one of the devices (Samsung 840 Pro), erase it to restore factory performance and re-add it to the array. The reason I want to do this to one of the SSDs is because the poor performance seems to be related to one specific SSD out of the two (although they are the same brand, model and firmware ver). But how do I erase a SSD from Linux? I mention that hdparm indicates that both drives are frozen at this time. Maybe because they are part of an md array? Thanks in advance!

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  • AirPlay over unicast DNS-SD. Anyone got it working?

    - by Moduspwnens
    We set up AirPrint using unicast DNS-SD on our campus about a year ago and it turned out to be a big success, so we're looking at trying to get AirPlay working so our faculty and students can wirelessly show content on our classroom projectors. There are still a couple of other things preventing an ideal implementation (username and password authentication, for starters), but I've been trying to set up a working demo nonetheless. Getting AirPrint working was basically just a matter of advertising the same records over a DNS-SD domain instead of the multicast (.local) one, but doing the same thing for AirPlay doesn't seem to cut it. The devices don't recognize the DNS-SD AirPlay servers as available. I've uploaded a screenshot of my DNS-SD configuration with the original (from AirServer, which works normally for multicast) here. I realize this is still a fairly new feature and documentation is lacking, but has anyone been able to get AirPlay working via DNS-SD? If it simply only works over multicast, I can accept that, but its potential is so appealing for us that I thought it'd be worth asking if anyone else has figured it out.

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  • Strip X Window System from OpenRD (Fedora core 8)

    - by disown
    I just got myself an OpenRD Client embedded box with an old Fedora 8 on it. Runs like a charm, only problem is that the default install has X on it, which I would like to remove in order to free up some space. I found a similar post here on the same topic, but yum groupremove doesn't work in my case, yum grouplist returns nothing, so I presume that no groups are defined. I don't know if this is because fedora 8 didn't have any groups, or because the OpenRD build is special in some way. In any case, I would like some tips on which package(s) to remove in order to remove an as big chunk of X as possible. Thanks in advance.

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  • Windows 7 can't copy file - Error 0x800700DF: The file size exceeds the limit allowed and cannot be saved

    - by JJGroover
    Any attempt to copy files larger than about 40 MB from a network share (a SAN running open filer / Samba) to my local machine running Windows 7 always results in the following error and the copy fails: Error 0x800700DF: The file size exceeds the limit allowed and cannot be saved. I've tried copying to my C: drive and a USB drive with the same results. Smaller files copy just fine. Clearly 40 MB is not that big of a file so I'm assuming it is some buggy interaction between windows 7 and Samba perhaps. Google has so far turned up nothing. Can anyone point me in the right direction?

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  • LED Display control software

    - by user978733
    My university bought new big led display from chinese manufacturers. What I want to do is, show some visualizations (like Windows Media Player, Winamp, Itunes ... does) with music. I'd just drag the application window to show on screen But main problem is,The software that controls it (called "Led Vision") doesn't support showing applications' windows: It shows limited types of the files, such as, powerpoint presentation, video files, picture files.. etc. Now the question is, where I can find the visualization video files? something that created in After Effects, looks like that:

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  • Dynamic dns client stops updating when login off Windows

    - by Sami-L
    Running a dynamic dns updater software on Windows server 2008 R2, when I log off the software stops updating, I concluded that I have to look for a dynamic dns client running as service, I found this task a bit heavy since there is a big variety on the net, it needs a long time to make the right choice as many details are to pay attention to, free, masked fees, fees, installed on machine, configured on router, trusted, not trusted, compliant with OS, not, ... That's why I am here to ask for help on this matter, I would like to be advised by skilled people, to find a trusted free dns updater (client) for Windows which can run as service, and maybe which can send email when update fails.

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  • Disabling the command enter shortcut on Mac Entourage.

    - by Bruce
    It seems like disabling a shortcut should not be such a big deal, but I cannot seem to be able to do it for any shortcuts and specifically not for the combination that I keep hitting by mistake, every single day. The smaller space bar makes it very easy to hit the command key by mistake, and the return is a commonly used key when typing. I keep sending important e-mails before I am done typing, or worse, before I am done editing. I do not necessarily want to disable all the shortcuts, but that one for sure. The choices for changing anything in Entourage seem very limited. [Entourage for Mac 2008. Version 12.2.8. (101117) ESD] It is easy enough just to hit "send." This short cut causes a lot more trouble than it saves. Help.

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  • How can I create multiple identical AWS EC2 server instances with large amounts of persistent data?

    - by mojones
    I have a CPU-intensive data-processing application that I want to run across many (~100,000) input files. The application needs a large (~20GB) data file in order to run. What I would like to do is create an EC2 machine image that has my application and associated data files installed boot up a large number (e.g. 100) of instances of this image split my input files up into 100 batches and send one batch to be processed on each instance I am having trouble figuring out the best way to ensure that each instance has access to the large data file. The data file is too big to fit on the root filesystem of an AMI. I could use Block Storage, but a given Block Storage volume can only be attached to a single instance, so I would need 100 clones. Is there some way to create a custom image that has more space on the root filsystem so that I can include my large data file? Or is there a better way to tackle this problem?

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  • Disk space profiling in Unix

    - by user1677770
    I'm looking for a tool to summarize how disk space is being used on very large partitions. Our file system is around 950TB, mostly broken up into 20TB partitions. There are some really nice graphical tools for visualising these file spaces: http://www.disksavvy.com/disksavvy_screenshots.html http://methylblue.com/filelight/ But I'm really not sure how well they will scale. Does anybody have any experience of these tools and can make any recommendations? Even something that parses and summarises a really big du output would be a good start.

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  • Limit disk I/O one program creates?

    - by Posipiet
    Hardware: one virtualization server. Dual Nehalem, 24GB RAM, 2 TB mirrored HD. Software: Debian, KVM, virt-manager on the server with several virtual machines that use Linux too. 2 TB Disk is a big LVM, each VM gets a logical volume and makes its own partitions in that. Problem: One of the programs that runs on one of the VMs creates huge disk load. This never was an issue, because the program never ran on such a powerful hardware. Now the CPUs are fast, and lots of I/O is the result. We cant do much against that at the moment, because the tool is a black box. On the other hand, the speedy computation is welcome. The program creates about 5 GB of temp files which get overwritten during the next iteration. Question: How can we limit the disk I/O for the process?

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  • Unix: Sync directory with FTP or SFTP directory

    - by Svish
    I have a website on my local computer running Mac OS X. I am wondering if there is any built-in command that I can run in the Terminal that will upload that website to my webserver either through FTP or, if possible, SFTP. Installing new commands through MacPorts is also a possibility. A big bonus would be that it only uploaded the files that needs to be updated and not everything else. It would also be nice if I can tell it to delete the files on the server that no longer exists locally once in a while. Any good tips?

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  • Adjusting color on one monitor in Nvidia Surround

    - by Chris Stauffer
    I'm currently running three 2560x1440 screens using Nvidia Surround. Two monitors are Yamakasi Catleaps (cheap Korean jobs) and the third is the Achievia Shimian (also Korean). The Catleaps have great color reproduction, however the Shimian is exceptionally blue tinted. With normal monitors the required correction would require minimal effort to accomplish. But these Korean monitors do not have hardware controls to do it. For those who are unfamiliar, Nvidia Surround basically takes all three monitors and makes one big "monitor" out of all of them (Xinerama for GNU/Linux folk), at a resolution of 7680x1440 in my situation. Therefore, adjusting the color profile in the Nvidia control panel changes the settings for ALL of the monitors simultaneously. Thus, I am looking for some software to adjust the Shimian (perhaps by just selecting the pixels that that monitor encompasses). Does anyone know of such a program?

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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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  • Revo 3610 not doing hdmi handshake

    - by DoomStone
    I am having a problem with my Revo 3610 witch is connected to my tv via hdmi. For some reason will it not do the hdmi handshake with the tv, so my tv does not think that there are anything in the hdmi port. I have tested the tv and it works find, with my laptop and dvd. It dose work some times, but this time have it failed for 2 days in a row, and i have tried rebooting, turning the tv off and on, and so on nothing helps. I can trick the TV to listen to the HDMI with connecting with my laptop and then change the hdmi back to my revo, this on the other hand results in the image going thoug nicely but there are a big fat "Check signal cable." on the screen. I have also tryed changing the resolution in the revo but this dose not help ether. Have any one had this problem before, and if so how did you fix it? Example: http://i.imgur.com/gguZ4.jpg

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