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• Latency in TCP/IP-over-Ethernet networks

  - by aix

  What resources (books, Web pages etc) would you recommend that: explain the causes of latency in TCP/IP-over-Ethernet networks; mention tools for looking out for things that cause latency (e.g. certain entries in netstat -s); suggest ways to tweak the Linux TCP stack to reduce TCP latency (Nagle, socket buffers etc). The closest I am aware of is this document, but it's rather brief. Alternatively, you're welcome to answer the above questions directly. edit To be clear, the question isn't just about "abnormal" latency, but about latency in general. Additionally, it is specifically about TCP/IP-over-Ethernet and not about other protocols (even if they have better latency characteristics.)

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• Macro to manage sport ranking and calendar?

  - by Ale

  I need to write a macro to manage ranking and calendar for curling turnament. The event will follow the Shenkel system first match determined by general draw after that every team has played one match is possible to determine the first ranking second match determined by the rule: 1st vs. 2nd - 3rd vs. 4th - 5th vs. 6th and so on after that every team has played two matches is possible to determine the second ranking and so on until the end (3 to 5 matches normally). Another rule is that from the second match is not possible to play against a team that I played before! I was thinking to use MS-excel but also Calc (both LibreOffice/OpenOffice) should be fine. Thanks in advanced

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• video streaming infrastructure advice

  - by Alchemical

  We would like to set-up a live video-chat web site and are looking for basic recomendations for software and hardware set-up. Most streams will be broadcast live from a single person with a web cam, etc., and viewed by typically 1-10 people, although there could be up to 100+ viewers on the high side. Audio and video do not have to be super-high quality, but do need to be "good enough". The main point is to convey the basic info in the video (and audio). If occasionally the frame-rate drops low and then goes back to normal fairly soon, we could live with that. Budget is an issue, so we are in general looking for a lower cost solution that will give us most of what we need in temers of performance and quality. We are looking at Peer1 for co-lo. The rest of our web site will be .Net / Windows platform. We are open to looking at any platform for the best streaming solution, although our technical expertise is currently more on the Windows side.

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• A minimal Linux distribution for my ASUS EEE PC

  - by Andrioid

  I recently bought myself a ASUS EEE 1000HE and I intend to use it for note-taking and light browsing at the University. The machine has a 10" screen so the interface needs to be very compact. I've already tried: EEEbuntu: Very nice driver support and out of the box experience. But I feel that it is too slow booting and the general experience is too heavy in my opinion. Moblin 2: Looks very cool, boots just fine but is way too unstable to use. Also find it annoying that I can't find hotkey documentation anywhere. Any Netbook OS recommendation welcome (although those specific to my model would be great). There is an entire jungle of distributions out there, so if you've been on a safari, please share your experience.

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• How to build a small network/server at home, basics

  - by Moe

  I'm one class away from my BA IT, I took several classes in general IT. Out of all the books I found just two to be really beneficial. I'm trying to get the hands on experience so my question is.... I want to build a small network in my home, wireless and also wired; printer, laptop, desktop, server (I have 4 1TB external drives of movies/music I want to be available to all computers) Where would I start from building a server with my hard drives, good modem, router, switch port, firewall internet speed/connection etc. This is my first project I want to try.

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• Which e-reader for O'Reilly books?

  - by Tim

  Most of my programming books are from O'Reilly. Several of them need to be updated, and I'm thinking of going for an e-reader this time. O'Reilly sell their e-books as a multi-format bundle (PDF, EPUB and Mobipocket (Kindle)). Has anyone done a comparison of the formats as for suitability on a small e-reader screen? In Europe, the Kindle DX is not (yet?) available, so I'm not sure whether a Kindle or a Sony (or some other reader) is best suited for these books. Disregarding other advantages/disadvantages of the different readers for now, which one in your opinion gives the best experience with O'Reilly books in particular (or programming books in general)?

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• acessing a subnetwork from within a vm

  - by yan bellavance

  I have a pc running windows 7. I have vmwareplayer running RHEL5 I have 1 physical ethernet connection. this ethernet connection is wired to a hub. there is another device on that hub that needs to be in a certain subnetwork (192.168.0.xxx)(lets call him device X) but the general network is 192.168.1.xxx How can I configure the network adapters so that I can ping device X from RHEL5 in the vm. Originally I could ping google from both windows and rhel (I was in the .1 network) but not device X since he is on a different subnetwork address. Now that I have put it on the .0 I can ping device X from windows but not from rhel5 and cannot access the web. I did this by manually setting the IP address.

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• Troubleshooting a high SQL Server Compilation/Batch-Ratio

  - by Sleepless

  I have a SQL Server (quad core x86, 4GB RAM) that constantly has almost the same values for "SQLServer:SQL Statistics: SQL compilations/sec" and "SQLServer:SQL Statistics: SQL batches/sec". This could be interpreted as a server running 100% ad hoc queries, each one of which has to be recompiled, but this is not the case here. The sys.dm_exec_query_stats DMV lists hundreds of query plans with an execution_count much larger than 1. Does anybody have any idea how to interpret / troubleshoot this phenomenon? BTW, the server's general performance counters (CPU,I/O,RAM) all show very modest utilization.

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• Worth it to move /var to physical disk vs logical?

  - by Tammer Ibrahim

  Brief question about partition layout. I use an SSD for /, /boot, /usr, & /home partitions. I'd like to move /var to a mechanical disk to minimize writes to the SSD. I'm mainly concerned about maximizing drive life rather than maximizing performance (although I obviously wouldn't want to cripple my server). My mechanical disks consist of two drives sharing LVM, and a third used for nightly rsync backups. I also have a bunch of old 2.5in hard disks lying around. My question is, should I simply create a new LVM volume '/var' on my primary data store, or would it be worth the increased energy consumption (in terms of maximizing the lifetime of the LVMed drives) to install a low volume 2.5in disk to use just for /var? On a more general level my question is about the trade offs of placing OS mounts on the same physical volumes as my data. Thanks for any help!

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• Run shell script on a command

  - by LinuxPenseur

  Hi, I want to run a shell script when date -s <string> command is used. For example i want to log the command to the file /tmp/user.log by executing the following command in the shell script logger -p user.notice "date -s command executed" -f /tmp/user.log How can run a shell script when date -s <string> is executed on the shell? To make it more general, I want to run my shell script when someone else issues a particular linux command on my system. How to do this?

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• Give apache write access to DocumentRoot on dev server

  - by Abhi Beckert

  I've got apache running on my mac workstation (OS X 10.7, with the pre-installed copy of apache), and our web applications require write access to certain sections of the filesystem to run (usually just a tmp dir, but sometimes more than that). We have (literally) thousands of clients, and I want to be able to quickly grab a copy of any website's code, and have it "just work", however I always need to manually modify the unix permissions of specific directories after pulling a client's website out of source control (the list of directories varies from one client to another, as it has changed over the years). Since it's a dev server, firewalled off from the general internet, I would like to give apache/php write access to the entire DocumentRoot. How can I do this? I tried chmod 777 on the DocumentRoot, but if I create a directory inside it, the permissions are still 755 (owner: me, group: wheel). I think there should be a way to force all files created inside DocumentRoot to be 777 or perhaps 775, with the _www user added to the wheel group?

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• Thinking about buying a LG 30" monitor

  - by evan

  I'd love to get http://www.newegg.com/Product/Product.aspx?Item=N82E16824005115 but I'm wondering if I should hold out until more LED monitors are on the market. I love really like the brightness of the 27" imac monitor and the above monitor is only rated at 5 cd/m2 less than that monitor, but wouldn't a back lit monitor appear to be much brighter than an LCD monitor? Does anyone know how the above monitor compares to the 27" imac monitor? Why are Apple monitors in general so much more expensive than other monitors - just the brand name? I must be confused about how to read the specs? Thanks in advance for your input!

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• baffling stat pauses - (reiserfs)

  - by Twirrim

  I've got a SuSE server with reiserfs formatted partitions, all on a RAID1 mirror. I'm noticing odd spikes in iowait, but generally all seems okay. iostat claims not even 3% iowait in general: avg-cpu: %user %nice %system %iowait %steal %idle 6.53 0.03 1.45 2.92 0.00 89.07 After tracking down some odd behaviour when ls'ing, it appears "stat" (ls is aliased to include color which does a stat process on each file) randomly takes 5 seconds on a file in the directory. ReiserFS does a file system sync every 5 seconds, but that's interval between not length of time taken to sync. Out of curiosity I did remount using noatime to see if that would help though as it would reduce sync's workload, but no joy. Anyone got any thoughts what might be causing this pause? Disks appear healthy, RAID controller believes the RAID is healthy, and io stats show the disks aren't working very hard at all.

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• Recommended website performance monitoring services? [closed]

  - by Dennis G.

  I'm looking for a good performance monitoring service for websites. I know about some of the available general monitoring services that check for uptime and notify you about unavailable services. But I'm specifically looking for a service with an emphasis on performance. I.e., I would like to see reports with detailed performance statistics from multiple locations world-wide, with a break-down on how long it took to fetch the different website resources, including third-party scripts such as Google Analytics and so on (the report should contain similar details such as the FireBug Net tab). Are there any such services and if so, which one is the best?

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• Distributing entropy to virtual machines.

  - by Louis

  Dear All, I'm interested in generating secret keys for SSL on virtual machines using true randomness. By true randomness I mean the same level of entropy that can be generated by UNIX's dev/random and entropy gathering daemon (EGD). Is there a "general knowledge" recipe to route entropy from the physical layer to the virtual machines via the hypervisor regardless of the Hypervisor/Guest OS combination? Example: suppose one "hypervises" with VMware VSphere and instantiates Windows Guest OS. Can this hypervisor collect entropy from its peripherals (like dev/random/ would) and distribute it to these guest Windows OS? When considering the big vendors (VMware, Hyper-V, Citrix, etc), do they have entropy pools that gather entropy that can easily be pushed to their respective virtual machines? Louis

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• Can Microsoft Security Essentials Signature Update Notifications be Avoided?

  - by Goto10

  I have my Windows Automatic Updates set to "Notify me but don't automatically download or install them.". However, if I install Microsoft Security Essentials, can I have the daily virus signatures downloaded and applied without being prompted each time by Windows Update? I like to have the control of installing general Windows Updates, but prefer not to have to accept the signature definitions that I expect to have applied every day (would get a bit tedious). Using XP Home SP 3. Just wanted to check this over before deciding whether or not to go for Microsoft Security Essentials.

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• Windows authentication through IE - specify the domain

  - by Chris W

  This question really relates to allowing to logon to a SharePoint installation from home but I guess it's a general IIS security question. When the login box pops up to collect the windows credentials the user can just type in their user name on Safari/Chrome/FF and they can login correctly. On IE authentication fails as it seems to pass their local machine name by default and the user needs to replace this with domain\user. Not a big problem in some cases but we'd prefer it if the users didn't have to enter the domain name portion. Is this simply a feature of IE that we can't control or is their something we can do with IIS/AD etc that will allow us to provide a default domain if one isn't specified?

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• hardware for pushing buttons

  - by Elazar Leibovich

  Many times I want my computer to interface old hardware. Such as radio, light switch, etc. This mostly involves pushing pressing and moving various buttons and switches. I don't want to buy new hardware I want my computer to interface the old hardware I already have. I thought about it and reached to the conclusion that what I need is a general purpose button-pusher hardware. I need a simple device I can interface by a computer and would be able to push most of the buttons we have in daily accessories, without damaging the button. Is there any such accessory availible?

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• HTTP 401 Challenge and HTTP 302 Login/Redirect won't work together in IIS7

  - by RandomBen

  I am developing a website using .NET 3.5 that allow users to visit the site and create logins using the standard Microsoft login controls. However, users do not need to login to do general things like view products. Now I need to setup the site so some of our Traveling Sales people are able to access it but not allow anyone else to access it. The easiest way I know how to do this is to turn on Windows Authentication for the Site in IIS7. When I do that I get all sorts of errors due to also having Forms Authentication turned on. If I turn Forms Auth then I get a different kind of error. Does anyone know how to make Forms Auth and Windows Auth play nice on a single site in IIS7 or some other way to create a required login without having me kill Forms Auth?

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• IT Audit checklist

  - by PHLiGHT

  I recently have taken on the position of a one man show for a company that is going to have an audit. The network isn't anywhere close to prepared and I have been looking for a general audit checklist since one hasn't been provided by the auditors and haven't found much good information out there. Does anyone have a nice template that will give me a good starting point. I know that this will be highly customized to the company but a starting point will be helpful to outline to management just how much work is needed. Thanks,

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• Websphere SSL handshake with active directory cluster

  - by ring bearer

  We have a WebSphere based application that uses Active Directory(AD) based security configurations. Under WebSphere "Global security" we have configured the active directory server and connection parameters. Active directory server is actually a cluster of four servers, say, serverdc01, serverdc02,serverdc03 and serverdc04. Each of these servers have their own root certificate with CN=serverdc01, CN=serverdc02 ..so on. So to set up SSL communication, I need to retrieve certificate of active directory and save it in WebSphere's trust store. When I retrieve certificate by putting AD server name, port and retrieve certificate I randomly get certificate of one of the serverdc01,serverdc02 ... Then I save that certificate to trust store. Question is : Do I have to save certificate from each of the serverdc01,serverdc02 ...in cluster to WebSphere's trust store? What are general strategies so that each server in the cluster does not require its own root certificate?

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• EloTouch touchscreen suspends correctly but does not come out of standby on Ubuntu 10.04

  - by Ton van den Heuvel

  I am using an EloTouch touchscreen on a minimal Ubuntu 10.04 installation. I have a bare Xserver running without any desktop environment, just an xterm. The touchscreen is working great, but there is still one small problem. As soon as the touchscreen goes to standby, it is not coming out of standby when touching the screen. Using a keyboard or mouse does get it out of standby though. I am looking for any hints or directions to a cause of this problem. Is this an x.org configuration problem? A driver problem? Is this a known problem with touchscreens in general? Any pointers are welcome. The driver I am using is an unreleased EloTouch driver (3.5.0). I received it through a reseller who can not give me any technical information unfortunately.

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• What are the advantages and disadvantages of having a hosted firewall?

  - by Roy

  Would you rather have your firewall hosted or in house if you've got the skills to manage it? We currently have 6 remote offices and 2 different ISP's, one private network and our firewall (Watchguard, licenses are due to expire) is also our main gateway. I don't see how a hosted firewall (in this case Fortinet) is going to work for us especially when it's cheaper to buy our own firewall and the transition from one ISP to a new provider will take some time because our current contracts aren't due to expire soon. What are to pros and cons of having a firewall hosted by your ISP in general?

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• Streaming Flash Video - getting my feet wet

  - by Travis

  I'm working on a project that will involve having a couple thousand short videos online. I haven't done anything with online video before and this is all a bit new to me, so I am looking for some general advice... I would like to use Flowplayer, and I would like to encode the videos as H264s. I am enamoured with Flowplayer's slow motion feature, which if I understand correctly, is only available using a Wowza server. I'm wondering: Is it advisable to use a delivery network of some sort? (Flowplayer seems to have a partnership with HDDN, and recommends them. http://www.hddn.com/) Or would I be better off purchasing Wowza and installing it on our own server? (At first glance, it looks as though signing up with a network like HDDN is much simpler, but perhaps there are problems that come along with this...?) Any tips / warnings of imminent peril would be much appreciated. Thanks in advance.

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• Virtual box - How to add disks and move var, opt and home to them?

  - by Jarrod Roberson

  I created a CentOS 5.6 Guest OS Virtual Machine. I made the first disk 10GB, I am rapidly outgrowing it. It was suggested that I make disks for my /var, /opt and /home directories and move them so I can better manage the disks for backing up and what not. This sounds like a good idea. I know how to create the disks in Virtual Box. I have dug around Google and the internet in general and all my attempts at doing this have failed. Snapshots are awesome! I can get the drives fdisked, and I have had limited success mounting them to /mnt/var, /mnt/home and /mnt/opt, but even in single user mode ( init 1 ) I can't get the entire contents of the directories to move over, and then the machine won't reboot correctly. cd /var cp * -ax /mnt/var The /var directory in particular is not wanting to move everything to the new location. How do I format, mount and move the /var, /opt and /home to my new disks?

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