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• How do I force a specific MTU for only certain TCP ports?

  - by Dave S.

  Background I have a set of embedded hardware deployed in the field. These remote machines connect back to my servers at AWS running Ubuntu and I use the iptables mangle chain to lower the MTU to 500 so these devices are happy. For reference, this is the iptables rule I am using: -A POSTROUTING -p tcp --sport 12345 --tcp-flags SYN,RST SYN -o eth0 -j TCPMSS --set-mss 500 Current Problem I'm trying to spin up some servers on the Joyent Cloud using SmartOS, but I can't find any information on selectively changing the MTU like I can on Linux (e.g. all info I've found is on changing it globally, which is not what I want). How would I do it so that all connections on TCP port 12345 get the MTU I want?

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• How do you test a new email filtering system?

  - by Zoredache

  What method do you use to test or evaluate potential new email filtering systems before you set it up on your production network? I am particularly interested in methods that are appropriate for small/medium sized organizations with a single mail server without the resources to build a duplicate of their email system.

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• What is the optimum number of admins to server?

  - by monocasa

  Hello all. I'm starting a business, and I'd like to know what you guys think the optimum number of admins to server ratio is for financial modeling reasons. Or if there's a better metric to use? I come from an embedded programming background so this is an area that I'm pretty squishy on knowledge-wise. : \ Additional Info: There will be a lot of servers. Mainly Linux boxes, with about 10% Windows boxes. Thanks in advance!

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• Looking for event management application

  - by taudep

  Hello, I'm looking for a web-based event management application for managing events (or activities) on certain days that I setup. And then I want people to be able to sign up for them. I'm looking for something that can then be embedded in my website, similar to a Google Calendar. Then for a given event's day, I can click on it, see who's attending. Ideally, I wouldn't have to invite people to the event, but they can just sign up for it. I'm not looking to use something like Evite. This application is going to be used to manage a schedule of bike races, and who from my club will sign up for them. Thanks for any suggestions.

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• How to have 2 windows machines on the same network with the same IP address

  - by Stu

  I have a custom made ADC device that is spitting out data by addressed UDP packets. I have that device plugged into a 4 port switch. I have one windows embedded standard 7 machine which is the normal recipient of that data. To be able to receive the data (Using LabVIEW) the windows network adapter IPv4 settings must have a static IP address that corresponds to the UDP packet destination. I would like to add a second windows machine (This one is just regular Win 7 Pro) to simultaneously catch the data, however with all devices connected to the switch, the Win 7 Pro machine recognizes an IP address conflict and will not take the setting for the required static IP address. (The network adaptor settings show that the correct value has been entered but ipconfig shows that it is not actually set.) Neither windows machine needs to transmit network data, they only need to be able to receive the UDP data from the ADC device. Is there any way to disable this IP address conflict detection 'feature' of windows networking?

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• Windows 7 - Virtual PC or Workstation 7.1 - Not working 4 me

  - by George

  I have a Windows 7 Ultimate - 64 bit Operating System When I'm trying to create virtual machine Windows Server 2008 64 bit I'm getting the same error neither with Virtual PC or Workstation 7.1 Error: 64 bit guest operating systems are not supported by this host and will not run and Status: 0xc000035a info: Attempting to load a 64 bit application however this CPU is not compatible with 64 bit mode. Is it any settings I'm missing or can you give me a suggestion about workaround, or what do I need to make it work.

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• Where should I plug in my monitor -- Motherboard or Graphics card?

  - by Jeremy White

  Assuming I am using the following equipment... motherboard with HDMI/DVI & no embedded graphics discrete graphics card (nVidia or ATI) on PCI-E slot Intel CPU with integrated graphics ...where should I plug my monitor into the computer? Presumably, I'll get the fastest speed on games connected directly to the graphics card. But there is also power savings when connecting to the motherboard and accessing the Intel on-board graphics. I've read that some motherboards can switch automatically between the Intel graphics and discrete graphics. Is that something that works well, and where do I connect the monitor to enable that?

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• Is there a LocalAppData Environement Variable in Windows 2003?

  - by brendan

  Per this question I need to call via code the following paths: Windows 2003: C:\Documents and Settings\Administrator\Local Settings\Application Data\Google\Chrome\Application\chrome.exe Windows 2008: C:\Users\Administrator\AppData\Local\Google\Chrome\Application\chrome.exe Ideally I could use the environment variable %localdata%\Google\Chrome\Application\chrome.exe but this does not work for me in Windows 2003. Should it? How can I refer to this path in both systems using environment variables?

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• Forcing Acrobat Reader font

  - by Jack

  Hello, I have a netbook with Linpus Linux and I'm trying to open automatically generated documents with Acrobat Reader that use Verdana but without having it embedded inside the PDF file. Linpus doesn't come natively with any Verdana font so I had to install them inside /usr/share/fonts/by doing mkfontdirand fc-cacheto force a recache of the fonts. Then I've been able to select it inside other programs (eg. OpenOffice) but I'm still unable to open these PDFs. It seems that Acrobat is unable to find the font anyway. Since I have no control on how these PDFs are generated, is there a way to force Acrobat to use a specific font is the one it needs is unfound? Or maybe Acrobat needs a different kind of font configuration on Linux? Thanks in advance

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• On Solaris, how do you mount a second zfs system disk for diagnostics?

  - by Matt Ball

  (Cross posted from Stack Overflow 1) I've got two hard disks in my computer, and have installed Solaris 10u8 on the first and Opensolaris 2010.3 (dev onnv_134) on the second. Both systems uses ZFS and were independently created with a zpool name of 'rpool'. While running Solaris 10u8 on the first disk, how do I mount the second ZFS hard disk (at /dev/dsk/c1d1s0) on an arbitrary mount point (like /a) for diagnostics?

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• SQL Clustering on Hyper V - is a cluster within a cluster a benefit.

  - by Chris W

  This is a re-hash of a question I asked a while back - after a consultant has come in firing ideas in to other teams in the department the whole issue has been raised again hence I'm looking for more detailed answers. We're intending to set-up a multi-instance SQL Cluster across a number of physical blades which will run a variety of different systems across each SQL instance. In general use there will be one virtual SQL instance running on each VM host. Again, in general operation each VM host will run on a dedicated underlying blade. The set-up should give us lots of flexibility for maintenance of any individual VM or underlying blade with all the SQL instances able to fail over as required. My original plan had been to do the following: Install 2008 R2 on each blade Add Hyper V to each blade Install a 2008 R2 VM to each blade Within the VMs - create a failover cluster and then install SQL Server clustering. The consultant has suggested that we instead do the following: Install 2008 R2 on each blade Add Hyper V to each blade Install a 2008 R2 VM to each blade Create a cluster on the HOST machines which will host all the VMs. Within the VMs - create a failover cluster and then install SQL Server clustering. The big difference is the addition of step 4 whereby we cluster all of the guest VMs as well. The argument is that it improves maintenance further since we have no ties at all between the SQL cluster and physical hardware. We can in theory live migrate the guest VMs around the hosts without affecting the SQL cluster at all so we for routine maintenance physical blades we move the SQL cluster around without interruption and without needing to failover. It sounds like a nice idea but I've not come across anything on the internet where people say they've done this and it works OK. Can I actually do the live migrations of the guests without the SQL Cluster hosted within them getting upset? Does anyone have any experience of this set up, good or bad? Are there some pros and cons that I've not considered? I appreciate that mirroring is also a valuable option to consider - in this case we're favouring clustering since it will do the whole of each instance and we have a good number of databases. Some DBs are for lumbering 3rd party systems that may not even work kindly with mirroring (and my understanding of clustering is that fail overs are completely transparent to the clients). Thanks.

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• Is it really necessary to call /bin/sync twice before an unmanaged power-off?

  - by Jeremy Friesner

  Hi all, My company sells an "embedded device" which is implemented as a headless Linux box with ext4 on an internal SSD. Some of our users have a habit of doing a "save current settings" on this box, and then cutting power to the unit as soon as the unit reports that the save completed (ie two seconds later). This was causing occasional corruption of the saved files, as the data wouldn't always get flushed to the SSD before the power went out. So I tweaked my software to run /bin/sync immediately after writing the file (after closing the file handle but before notifying the user that the save completed). This appears to fix the issue, but my coworker says that one call to /bin/sync isn't sufficient, and that to be really safe I ought to run /bin/sync twice in a row. That sounds like paranoia to me... Perhaps a habit from earlier versions of Linux or unix whose sync utility didn't work reliably. Does his advice have merit, or should one call to /bin/sync suffice?

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• Win 2003 STD network adapter always showing DHCP when in static IP configuration, + it loses the DNS

  - by Darragh

  Hi, I have a server that after the first configuration it was DHCP, now I have added it to our domain and in a static IP, however after a few moments it returns to DHCP but with only some of the IPv4 setting staying the same, It loses DNS for example. I'm not sure what is causing the problem but all I know is this started to happen after I added it to the domain, Would it be a domain policy? or the NIC drivers Spec; Dell M605 Blade server Windows 2003 STD SP1 Intel Xeon Quad core NIC: Dual embedded Broadcom NetXtreme IITM 5708 Gigabit Ethernet NIC w/ TOE

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• software to auto-backup MYSQL + images etc on Server to Network HD in my house?

  - by haroldo

  While i'm sure i can write a CRON to do this and some how open the ports on a network hd in my house, to be honest i'd rather spend a bit of money on some good software with a nice visual interface.. are there any such all-in-one server backup systems? nightly backups of the MYSQL db weekly backups of entire site (images etc) my server is a VPS hosted by https://www.memset.com

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• Recommendations for stable, reliable flash drives

  - by Josh Kelley

  We're looking to purchase some flash drives for use in some embedded devices. Most of our requirements aren't too different the generic "good, fast" flash drive: reliability is very important, speed is good, and so that the drive will fit, the case shouldn't be too large (so no OCZ Throttles). Consistency is also a major priority; we'd like to be able to buy more or less the same product a year or two from now without having to worry about the manufacturer swapping drive components with less reliable or slower parts. (We've been burned already by our previous manufacturer doing this.) Any recommendations, especially regarding consistency? I can read Ars Technica to get an overview of current models, but what are consistently good models?

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• Get tortoisesvn to give me filenames with build number in the filename

  - by EricJLN

  I am on a Windows 7 box, and I have tortoisesvn on my machine. After getting a little familiar with svn and tortoisesvn on a code repository, I set up a local repository to manage revisions of some word and powerpoint documents. I want to figure out some scripted way to output a set of files with the build/revision number embedded in the filename. I will then email the files to some business people to review. For example, say I have a group of files in my working directory: PresentA.pptx PresentA-notes.docx PresentB.pptx and TortoiseSVN repo browser tells me that I am currently at revision 21 for PresentA.pptx and PresentA-notes.docx but at revision 25 for PresentB.pptx, I would like some way to get 3 files with the following names: PresentA-r21.pptx PresentA-notes-r21.docx PresentB-r25.pptx Alternatively, if revision 25 is the current value for the repository, having all the names appended with -r25 would work, too.

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• Braces (syntax) highlighting in OpenOffice Math formula text editor

  - by Oleksandr Bolotov

  When you use OpenOffice Math, in upper part you see formula and formula text editor in lower part. Almost like this: %sigma = 2 %mu %epsilon + %lambda Tr(%epsilon)I So my questions are: How to replace OpenOffice Math's formula text editor with own text editor? ... or how to enable braces (syntax) highlighting in embedded editor? ... are there any extensions for anything like this? I need this because sometimes it's too much braces and stuff and it's hard to distinguish which braces match each other. Please do not suggest me to use MathType Mathematica (or anything) instead of OpenOffice Math (because I'm almost happy with it:)

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• Local admin password recovery: Windows Vista

  - by Jim Dennis

  I am faced with an unsettling situation. A friend of my father's has rather suddenly become a widower. Naturally they've taken care of the bank accounts and all the normal mundane things that people have been doing for a century or so. However, she was the computer user of the household. He was aware that they had some online banking stuff and bill paying stuff ... and that she spent lots of time on FaceBook and stuff like that. However, he doesn't know what her local passwords were (actually only vaguely aware that her couple of desktop and couple of laptop system even had passwords). He's never heard of "admin" passwords so that's no good either. In the past I've used KNOPPIX and the old LinuxCare "bootable business card" to recover NT passwords. I've never done this with MS Windows Vista. So, I'm looking for the best advice on how to do this. Naturally I do have physical access to the systems (the two laptops are charging across the room from me; and her old desktop systems are, naturally, still back at his place). Getting it right is much more important than fast or easy (I don't want to mess up those filesystems and possibly lose some photos or other stuff that he or his kids or grandkids will want). (BTW: if anyone things this is some social engineering hack to play upon the sympathies of the community to get the information I'm asking for ... think about it for a minute. I know about IRC and the "warez" boards. I know I can find this stuff out there if I dig enough. I'm just asking here because it'll hopefully be faster and, secondarily to raise awareness. As more of us put more of our lives online ... as we get older and as places like FaceBook continue to widen the appeal of computing to a broader segment of older people ... we are, as computer nerds, going to see a lot more of this. Survivors will needs us to be careful, sensitive and ethically responsible as they try to recover those bits of legacy during their bereavement. I can now tell you, first hand, it sucks!)

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• Forcing Acrobat Reader font

  - by Jack

  I have a netbook with Linpus Linux and I'm trying to open automatically generated documents with Acrobat Reader that use Verdana but without having it embedded inside the PDF file. Linpus doesn't come natively with any Verdana font so I had to install them inside /usr/share/fonts/by doing mkfontdirand fc-cacheto force a recache of the fonts. Then I've been able to select it inside other programs (eg. OpenOffice) but I'm still unable to open these PDFs. It seems that Acrobat is unable to find the font anyway. Since I have no control on how these PDFs are generated, is there a way to force Acrobat to use a specific font is the one it needs is unfound? Or maybe Acrobat needs a different kind of font configuration on Linux? Thanks in advance

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• Start Daemonised GNU Screen from script a allow calling script to end

  - by tez

  I have a script on an embedded device that calls screen to start if a user logs in via a ssh session... #!/bin/sh SCREENRUNNING=`pgrep SCREEN` if [ -z "$SCREENRUNNING" ]; then echo "Screen not running so let's start the Master session sleep 2 screen -dmS Master sleep 2 screen -x root/Master else echo "Screen is already running let's connect to existing session" sleep 2 screen -x root/Master fi However this keeps the calling script active till the screen session exits,even if it's detached. What I want to do is have the calling script finish and exit while the screen session stays active. I've tried daemonising the screen -x lines and adding an & to the end of the screen -x lines neither of which work properly. Ideas?

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• How does BTRFS compare to ZFS?

  - by Zubair

  I am considering which OS and filesystem to use on some new servers I have and am considering either Free BSD with ZFS, or Linux with BTRFS. The programs I have run on both systems, so the only issue is reliability of the filesystems and performance, etc.

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• Making Puppet manifests/modules available to a wide audience

  - by Kyle Smith

  Our team rolled puppet out to our systems over the last six months. We're managing all sorts of resources, and some of them have sensitive data (database passwords for automated backups, license keys for proprietary software, etc.). Other teams want to get involved in the development of (or at least be able to see) our modules and manifests. What have other people done to continue to have secure data moving through Puppet, while sharing the modules and manifests with a larger audience?

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• Linux bonded Interfaces hanging periodically

  - by David

  I've several hosts that are showing problems with connectivity. When working from the command line, for example, typing is frozen for a second or so, then recovers - then it does it again. The most egregious example host would freeze (input) for 15-30 seconds, then recover and go out 5 seconds later. Switching cables didn't do anything - but removing one of the physical cables caused everything to clear up instantly (which why I think this is a network problem). Looking at the network I couldn't see any packets floating that would explain this. These ethernet interfaces (Gigabit Dell) were working normally previously, but since we moved the systems - and put them on a new set of switches - this has been a problem on multiple theoretically identically-configured hosts. The original switches were an HP Procurve 1810-24G and an HP Procurve 1800-24G connected with LLDP; the new switches are both Cisco SG 200-26, which I understand are rebranded Linksys switches. Is this caused by a problem with the switches? Is it the switch configurations? Are the Cisco switches incapable of handling this? I don't see where the configuration is located; I searched the usual /etc/sysconfig/network/devices but there's nothing in there about options (like mii polling) and nothing about the method of balancing the two. Searching scripts, I can't find anything in /etc/init.d/network either. The hosts are almost all Red Hat Enterprise Linux 5.x systems (5.6, 5.7) but some are Ubuntu Server 10.04.3 Lucid Lynx. I need help with both if it comes to that. UPDATE: We're also seeing some problems with servers on the original switches. The HP switches and the Cisco switches are also interconnected (temporarily); there is a cable run from one switch to the next. Pings on any of these hosts show about one ICMP packet out of every 5-6 getting dropped (timed out). Could there be an interaction between the two switches? Oh, and the hosts are using bonding with Balance-RR as the method.

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• I want a hyperlink to open a browser tab, then all subsequent link clicks go to the same tab

  - by rossmcm

  I suspect I'm out of luck on this one, but here goes... Say I have a CHM help file that has http:// hyperlinks embedded in the help pages. When the user clicks on a hyperlink of the style: <a href="http://www.example.com" target="_blank">click here!</a> a browser window is opened and the target web page is displayed. If a browser is already open a new tab is created and the target displayed in that. If the user clicks on another link (or the same link) another browser window/tab opens, and so on. Is there any way I can force all clicks of the links to go to the same tab/browser window?

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• How do I publish a Power Point Presentation that is High Quality and no lag on the Web?

  - by Luke Hutton

  I have a ~22MB Power Point Presentation (2007) that I need to be presented on a website for viewing. The file contains audio over several slides and some embedded images. What is the best practices or best way to present the presentation so it gets delivered the quickest and best quality to users? Some ideas I've thought of are: Somehow compress the file (.wav audio files, images) into a smaller presentation and save it as a Power Point Show (pps) so users can download it and use the free Power Point viewer? Convert it to video format (.avi) or something and stream it off the web? (Hopefully freeware) Save it as a web page? (but then it's only viewable in IE I believe)

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