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• How does IPv6 subnetting work and how does it differ from IPv4 subnetting?

  - by Michael Hampton

  This is a Canonical Question about IPv6 Subnetting. Related: How does IPv4 Subnetting Work? I know a lot about IPv4 Subnetting, and as I prepare to (deploy|work on) an IPv6 network I need to know how much of this knowledge is transferable and what I still need to learn. IPv6 seems at first glance to be much more complex than IPv4. So I would like to know: IPv6 is 128 bits, so why is /64 the smallest recommended subnet for hosts? Related to this: Why is it recommended to use /127 for point to point links between routers, and why was it recommended against in the past? Should I change existing router links to use /127? Why would virtual machines be provisioned with subnets smaller than /64? Are there other situations in which I would use a subnet smaller than /64? Can I map directly from IPv4 subnets to IPv6 subnets? My interfaces have several IPv6 addresses. Must the subnet be the same for all of them? Why do I sometimes see a % rather than a / in an IPv6 address and what does it mean? Am I wasting too many subnets? Aren't we just going to run out again? In what other major ways is IPv6 subnetting different from IPv4 subnetting?

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• how to tune libstdc++ to the native architecture when building gcc

  - by John D

  I recently found that when I build my C++ software, I get about a 10% speedup by using the g++ march=native option. When compiling gcc and libstc++, is it possible to tune the libstdc++ library to the native architecture as well? I couldn't find any mention of this in the gcc install configuration documentation. (I'm building gcc 4.6.2 on Linux Mint 11 with an Intel Core i7 Sandy Bridge-E processor.)

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• macbook pro for developer

  - by Michael Ellick Ang

  Which of the following choices would be more beneficial to developers ? 13 inch Macbook Pro, Core 2 Duo, 4 GB Memory, 128 GB SSD - $1550 - Faster Storage 13 inch Macbook Pro, Core 2 Duo, 8 GB Memory, 250 GB HD - $1600 - More Memory 15 inch Macbook Pro, Core i5, 4 GB Memory, 320 GB HD - $1800 - Better CPU Thanks.

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• IIS Express only utilizes 13% of i7 Quad Core

  - by John Nevermore

  Since one of my scripts got incredibly complex, i was benchmarking the performance of moving some javascript processing logic to the server side in my ASP.NET MVC 4 application. According to taskmgr.exe, IIS Express only utilizes 13% of my i7. I decided to throw in 3 parallel tasks calculating the fibonacci sequence up to 50 and the IIS express still wouldn't utilize more than 13% of my cpu. Is there anything i can do, so that the application utilizes the full cpu, as it would in a real server ?

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• Moving Portable Office. Have a LAN & Phone line query?

  - by John Smith

  We are about to move a portable office that has 8 phones and 12 lan connections. They are all wired back to our main switch and Nortel bcm200 phone system which are only about 20m (65ft) away. After the move the office will be 180m (600ft) away from these. What is the maximum length of cable a digital phone line can be? I am aware that a lan connection can only be 100m (305ft) when using cat5e utp. Does this rule apply to phone connections also? If so how can I extend beyond 100m for the phones? I was going to install about three cabinets, 3 switches and 6 patch panels for the lan connections but the ideal struck me tonight that maybe I could run a fibre optic line. Would this be feasible? Any feedback on this is greatly appreciated. Thanks

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• Windows XP procedurally drop packets

  - by Michael J Mulligan

  We have a need in our office network to procedurally drop incoming packets on an XP machine acting as a server. By procedurally we mean to drop a percentage of packets incoming on the XP machine from a specific IP. Asked here because these seem like server related questions. And none of us have really any idea how to execute this. Another option is to introduce intermittent latency for an incoming IP. Thank you for your help.

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• Why did numbered list stop working after I hit Enter?

  - by Michael Leach

  I have a numbered list like: 1.0 Excel 2010 1.1 Introduction to Excel 2010 1.1.A. A general overview of Excel 2010, geared towards beginners 1.1.B. There are 3 videos in this series I put the cursor at the end of the last line on 1.1.B and hit Enter. The next line should begin with 1.1.C but nothing appears when the cursor returns to the next line. Another example, if I put the cursor at the end of 1.1.A and hit enter, I should get a new 1.1.B and the original 1.1.B should be renamed to 1.1.C. After hitting enter, a new 1.1.B doesn't appear and the previous 1.1.B drops all the way to the next page. So the next bullet number that should come up doesn't come up. I tried Microsoft Fix It to reset the Registry and that didn't work either. This is very frustrating. Does anybody know how to fix this?

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• How to change Windows admin password from guest user

  - by John Smiith

  How to gain access of admin account of Windows, I activated a guest user and I want to change the admin password from the command line. When I type: net user administrator password the response is System error 5 has occurred. Access is denied I am using winxp pro sp2 I am running this command from cdm.exe and I am running this command from guest user. I actually want to change my admin password from guest user.

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• Log and Block Website using Windows 2008 SBS

  - by John

  A client has asked me to setup Windows 2008 SBS to block and log websites from a list they will provide. As far as I know they only have standard edition which means I cannot use ISA. I was thinking of using squid authenticated against Active Directory. There is no budge for additional software. Does any one know of a different/better solution using either open source software or software that is available in Windows 2008 SBS? Thanks

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• Samba and Windows 7

  - by John Gaughan

  I built a new computer with the intention of it being primarily a home file server. Here is my setup: one desktop with Windows 7 64 HP one laptop with Windows 7 64 HP one desktop with Kubuntu 11.10 (server) The two desktops use static IPs, and I have hostnames mapped in the HOSTS files on all three systems. I have the same username/password combo on all three systems. I have been trying for a while now to set up Samba so the Windows 7 systems can see and use it. Even if I can get the server to show up, Windows is unable to log in. One of the first things I did was to enable LMv2 authentication, which this version of Samba (3.5.11) supports. The workgroup is set correctly. I can normally see the server, but cannot authenticate. Windows homegroup is turned off. Pinging between machines works fine, and the two Windows 7 systems work together flawlessly. What I am trying to do is set up Samba to use peer to peer networking using NTLM security and user-mode authentication. According to the documentation this is possible, but there are no examples that I could find. In all the googling I have done, I see a lot of people asking how to set this up but it either works for someone else and not for me (no idea what I'm missing), or it doesn't work. Has anyone gotten this to work? Is there a place I could download a smb.conf that is set up to work in this environment?

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• check_snmp with snmpv3 protocol giving "Unkown Report message" error

  - by John

  I'm trying to add a nagios command to use snmpv3 for monitoring printer status messages. When using the check_snmp command, I get the following error: External command error: snmpget: Unknown Report message Here is the command I'm typing in: ./check_snmp -P 3 -H <hostname> -L authPriv -U snmpuser -A snmppassword -X snmppassword -o 1.3.6.1.4.1.11.2.4.3.1.2.0 -C public -d "STRING:" -a MD5 These values for auth key, private key, username, etc all work when using snmpwalk. Can someone enlighten me as to what that error message really means? EDIT: It looks like check_snmp isn't taking my v3 credentials when passing over to snmpget. Here is my input with the verbose option: ./check_snmp -H <hostname> -o 1.3.6.1.2.1.2.2.1.10.1 -C public -m ALL -P 3 -L authPriv -U snmpuser -a MD5 -A snmppassword -x DES -X snmppassword -v And here is the output: /usr/bin/snmpget -t 1 -r 5 -m ALL -v 3 [authpriv] <hostname>:161 1.3.6.1.2.1.2.2.1.10.1 External command error: snmpget: Unknown Report message So I guess now my question would be: why isn't check_snmp passing all the commandline options to snmpget?

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• What is the best way to clone Win7 machines?

  - by John Hoge

  I'm looking to buy 5 new Win7 boxes and would like to ease deployment by cloning the OS. What I would like to do is install a fresh OS (Dell doesn't seem to sell machines without preinstalled crapware anymore) and then install a few apps on the first one. Once it is just right, I want to clone the OS and install the image on the other four machines and just change the machine name. Is this possible to do without any extra third party software? What I am thinking of doing is backing up the disk image of the first machine to a network share, and then booting the others to the windows install DVD and restoring the same image on each machine. Has anyone had any luck with this technique?

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• Diagnosing and debugging LAN congestion / connection issues

  - by John Weldon

  What are the top N tools / methodologies used to diagnose and repair network issues? Given a LAN, for example, where users are able to consistently ping an outside server, but any data intensive connections are flaky; how would you begin solving the network issues? I imagine issues like congestion, bandwidth constraints, throughput constraints, etc. are all factors, but I don't know how to diagnose those issues. I'm especially interested in LAN environments (rather than WAN)

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• How to deduplicate 40TB of data?

  - by Michael Stauffer

  I've inherited a research cluster with ~40TB of data across three filesystems. The data stretches back almost 15 years, and there are most likely a good amount of duplicates as researchers copy each others data for different reasons and then just hang on to the copies. I know about de-duping tools like fdupes and rmlint. I'm trying to find one that will work on such a large dataset. I don't care if it takes weeks (or maybe even months) to crawl all the data - I'll probably throttle it anyway to go easy on the filesystems. But I need to find a tool that's either somehow super efficient with RAM, or can store all the intermediary data it needs in files rather than RAM. I'm assuming that my RAM (64GB) will be exhausted if I crawl through all this data as one set. I'm experimenting with fdupes now on a 900GB tree. It's 25% of the way through and RAM usage has been slowly creeping up the whole time, now it's at 700MB. Or, is there a way to direct a process to use disk-mapped RAM so there's much more available and it doesn't use system RAM? I'm running CentOS 6.

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• Mysql Fail to start

  - by John Naegle

  I'm running a Ubuntu 12.04 LTS Virtual Machine. Last week, the VM stopped unexpectedly now mysql will not start on the VM. These two events may be related, they may not be. When I try to connect: $ mysql ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) Then: $ sudo service mysql start start: Job failed to start And $ dmesg [ 1838.218400] type=1400 audit(1374633238.253:50): apparmor="STATUS" operation="profile_replace" name="/usr/sbin/mysqld" pid=18473 comm="apparmor_parser" [ 1838.358656] init: mysql main process (18477) terminated with status 1 [ 1838.358695] init: mysql main process ended, respawning [ 1839.269303] init: mysql post-start process (18478) terminated with status 1 And $ service mysql status mysql stop/waiting I think this means mysql is crashing when it starts: $ sudo mysqld start 130723 21:51:24 InnoDB: Assertion failure in thread 3064211200 in file fut0lst.ic line 83 InnoDB: Failing assertion: addr.page == FIL_NULL || addr.boffset >= FIL_PAGE_DATA InnoDB: We intentionally generate a memory trap. InnoDB: Submit a detailed bug report to http://bugs.mysql.com. InnoDB: If you get repeated assertion failures or crashes, even InnoDB: immediately after the mysqld startup, there may be InnoDB: corruption in the InnoDB tablespace. Please refer to InnoDB: http://dev.mysql.com/doc/refman/5.5/en/forcing-innodb-recovery.html InnoDB: about forcing recovery. 02:51:24 UTC - mysqld got signal 6 ; Per the manual, I went to the data directory (/var/lib/mysql) and ran this: myisamchk --silent --force */*.MYI Then: $ sudo mysqld ... InnoDB: Your database may be corrupt or you may have copied the InnoDB InnoDB: tablespace but not the InnoDB log files. See InnoDB: http://dev.mysql.com/doc/refman/5.5/en/forcing-innodb-recovery.html InnoDB: for more information. ... Is my database corrupt? What can I do to recover? Re-install mysql? Something less drastic? I'm fine with losing the database, I just want a working system.

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• Overclock Failed

  - by John

  This morning when I tried to turn on my computer, the monitor would not display anything. The computer is on, but no UI on the monitor and no beep. I turned off the computer and turn it back on again. This time, the computer was on for about 2 seconds and automatically turned itself off for about 2 second and automatically turned itself back on. This happened two times without the monitor displaying any UI. On the third try, the computer did the same thing but when it turned itself back on, the monitor displayed this: American Megatrends Asus P8P67 Le ACPI bios Revision 1011 CPU Intel Core i5 2500K CPU @ 3.30GHz Speed: 3300MHz Total Memory 4096 MB (DDR3-1333) USB Devices Total: 0 Drive, 1 Keyboard, 1 Mouse, 2 Hubs Detected ATA/ATAPI Deivces SATA6G_2 Hitachi HDs821010CLA 332 SATA3G_1 Corsair force 3 SSD SATA3G_2 HL-DT-ST DB-RE UH12CS28 Overclocking Failed! Please enter setup to reconfigure your system. Press F1 to Run Setup. After I pressed F1, it went into the Asus EF1 Bios Utility. I couldn't do anything in there so I just exited. After which, the computer auto turned off and on again and I was able to use the PC like regular. This has never happened to this computer before and the day before, nothing seemed wrong, just regular use and some gaming.

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• Proper use of disk to disk to tape backup using de-duplication and LTO5

  - by Michael

  I currently have ~12TB of data for a full disk to tape (LTO3) backup. Needless to say, it's now requiring over 16 tapes so I'm looking at other solutions. Here is what I've come up with. I'd like to hear the community's thoughts. Server for Disk-to-Disk BackupExec 2010 Using De-duplication Technology 20+TB worth of SATA drives LTO5 robotic library connected via SAS 1Gbps NIC connected to network What I envision is doing a full backup of my entire network which will initially take a long time over the 1Gbps NIC but once the de-duplication kicks in backups should be quick. I will then use the LTO5 to make disk to tape backups and archive those accordingly. What does everyone think? Any faster way of doing the initial full backup over the 1Gbps NIC? What will be my pain points? Is there a better way of doing what I'm trying to achieve?

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• LSI 9260-8i w/ 6 256gb SSDs - RAID 5, 6, 10, or bad idea overall?

  - by Michael Pearson

  We're provisioning a new production server for our reasonably busy website. Our choice of host have available a 6 drive configuration with a LSI 9260-8i card. My initial thought was to fill all six bays with SSDs (Intel 520 256gb) and set them up in RAID. Good, bad, or terrible idea? Can the card handle it? Should we be using RAID 5, 6 or 10? This would be the first time the provider have filled all six slots for this rackmount with SSDs, so they're a bit hesitant. I'm wondering if somebody else with this card has done something similar in a production environment. We do about 43gb of writes per day and currently use about 300gb of storage. The server acts as webserver, database, and image store for approx 1 million files. The plan is to underprovision the SSDs by approximately 10% to 20% to increase their overall lifespan & performance. The fallback option is 2x480gb SSDs in RAID 1 and another 2x1TB HDDs in RAID 1. The motivation behind this is that the server rental cost difference between 2xSSDs and 6xSSDs is minimal (compared to the overall cost of the rental). We do not have any special high-IOPs requirements. However, if the configuration is known to work, I don't see a good reason to not use it and not have to worry about having separate 'fast and small' and 'slow and large' disks.

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• OpenAFS on Fedora/CentOS

  - by Michael Pliskin

  I am trying to see if OpenAFS fits my needs as a distributed filesystem and is a bit stuck. There are docs but they're all quite hard to understand, so asking for some expert advice here. My questions: which version to install? I need windows client support so I need 1.5 - right? But it is not stable.. Or is it? And don't see any pre-built rpms for it, so compiling from sources? tried to compile and it worked but it created a non-"mp" kernel module while my kernel needs an mp one - how to workaround that? do I really need a new fresh partition to start with or I can re-use an existing one and just make it available via afp? any nice HOWTOs around?

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• Free Hosting control panel

  - by John Maxim

  I'm in the mid of researching for one of the best hosting control panels. The server I run is Ubuntu and I have some experience with ISPConfig 2 & 3. Since I haven't explored any others available, what are the recommended ones for an Ubuntu server? I asked because I find that there seems to be some disabling and modifications required for an Ubuntu server if I need to use ispconfig which causes the server to change its actual way of running. It's quite good though, but any more recommended ones ? Something more organic? which doesn't require much breaking and changing. I'm not asking for the simple one, I don't mind going extra mile to install a powerful one but just try sticking with most Ubuntu's conventions will be an ideal one for me. And of course, if there happens to be something that meets the requirement as mentioned "Ubuntu conventions" and also simple to install at the same time, that'd be a bonus. Thanks in advance.

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• Inserting an image into a OpenOffice.org Calc cell

  - by John Kube

  Is there a way to insert an image inside a cell? When I choose "Insert - Picture" it inserts it so it's floating over the cells. That's not what I want. I want to be able to insert the image into cell A1, for instance.

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• Copy seleted row to another worksheet

  - by ???? ???????

  There are for ex. 10 rows in one worksheet. When user clicks on one row it should be presented on another worksheet. Is it possible? Any help to do it? EDIT: To clarify: In one sheet are presented for example student exam marks on first year: John 10 8 10 7 Nick 8 9 8 9 Maria 7 8 8 7 On 2nd sheet there are student informations on the second year: John 9 9 10 8 Nick 8 8 9 7 Maria 7 6 8 8 I want to have give some kind of final certificate for student so summary information should be presented on the third sheet. I doesn't need to be on click. There could be drop down list on the third sheet.

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• regsvr32 fails on Windows Server 2003 - LoadLibaray ("my.dll") failed

  - by John Mo

  The DLL in question is a VB6 web class. When deploying, the old one needs to be unregistered and the new one registered. This has worked for many years but has failed now with the following error in a message box: LoadLibrary("c:...\my.dll") failed - The filename, directory name, or volume label syntax is incorrect. I don't think there's a problem with the DLL being (un)registered because it's failing to unregister the existing DLL that was at one time successfully registered. I don't think there's a filename or path problem. Regsvr32 is executed using a batch file where the full path to the DLL is specified. The path has not changed. The batch file has not changed. The DLL has not changed (at least not the old one I need to unregister). It's a programming problem to me because I need to release an updated DLL, but I'm thinking it's maybe an admin problem best suited to the talents of the serverfault audience. I'm hoping somebody knows about a Windows Update or something that might hose regsvr32. Thank you.

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• How many times can data be read from a USB flash drive?

  - by John

  While I am aware that performing writes on a USB flash drive degrades the life expectancy of the device. I have heard the quantity of writes is anywhere from 100 thousand to 10 million, but I have not heard about number of read operations. Does reading from the device count toward this total? I am interested in writing only once to a flash drive and setting it to read-only. Then reading files from the device a thousand or more times per day, but am wondering if (at say 1,000 reads per day), the flash drive will need to be replaced within 100 days (assuming a 100,000 r/w cycle lifetime)?

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• Http-Only cookies in WebLogic: what versions support them/how and why are they supported?

  - by John

  We want to make all cookies set by our webapp http-only. I only have a basic understanding of the benefits of doing this but I'm told by security people that it's a Good Thing (tm) Our app is running under JDK1.6.05 and WebLogic10.3.0 After way too much digging around Oracle's website for documentation, I've found good evidence that the first version of WebLogic to support http-only cookies is 10.3.1. By "support," I mean the cookie-http-only deployment-descriptor element. Before we go about upgrading, I'd be nice to have these questions answered: 1a) Is it accurate that WL10.3.1 is the first version to support http-only cookies and that we're out of luck with 10.3.0? 1b) If we do indeed need to upgrade, is there an easy to do so under Windows? I've heard people mention an "upgrade jar" that you just stick in the classpath but I can't find any mention of this by Oracle. Does an easy way exist, or do we need to do a full-install of the new version? 2) What does the cookie-http-only deployment-descriptor element do when enabled? Will it ensure all cookies set by the application have an http-only=true attribute? Will it do more or less? Is there anything I'll have to do programmatically? 3) Is there anything in general I should know about http-only cookies, getting my web app to take advantage of them, or other security concerns?

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