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  • Use one Socket to send and recieve data

    - by volody
    What makes more sense? use one socket to send and receive data to/from a embedded hardware device use one socket to send data and separate socket to read data Communication is not very intensive but the important point is to receive data as fast as possible. On application side is used Windows XP and up.

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  • Bynary string search on one field.

    - by CrazyJoe
    I have 300 boolean fields in one table, and im trying to do somithing like that: One string field: 10000010000100100100100100010001 Ha a simple way to do a simple search os this field like: select * from table where field xor "10000010000100100100000000010001" :) Help!!

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  • two identical broadband lines working as one

    - by Katafalkas
    I have been trying to find an answer to this, but all I get is hobbyists trying to connect they linksys's and get some magic out of it. So I am thinking of a way I could combine two 100Mbp Fiber Optics lines into a single connection for our office. I assume it involves some CISCO learning or something like this. Was thinking that I might need to configure some big router to load-balance the NAT'ing in some way. I assume that meny of you have done something similar and maybe someone could share the knowledge or at least provide some tips ?

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  • Ruby installed on Ubuntu 10.10 slow on one machine but not other

    - by Aaron Jensen
    I have a machine that was provisioned several months ago. RVM was used to install ruby 1.9.3-p125 as well as 1.9.3-p125-perf. When I compared raw ruby performance to another identical machine the older machine smoked them. For example: ================================================================================ With in-block needle calculation ================================================================================ Rehearsal ---------------------------------------------- detect 3.790000 0.000000 3.790000 ( 3.800895) each 2.410000 0.000000 2.410000 ( 2.420860) any 3.960000 0.000000 3.960000 ( 3.972099) include 1.440000 0.000000 1.440000 ( 1.442862) ------------------------------------ total: 11.600000sec vs ================================================================================ With in-block needle calculation ================================================================================ Rehearsal ---------------------------------------------- detect 10.740000 0.000000 10.740000 ( 10.769366) each 6.080000 0.010000 6.090000 ( 6.106323) any 10.600000 0.000000 10.600000 ( 10.641606) include 4.160000 0.000000 4.160000 ( 4.171530) ------------------------------------ total: 31.590000sec I attempted to reinstall 1.9.3-p125 with rvm on the fast machine and that ruby is now slow. It's as if something changed in RVM, or I installed some package that made compiled versions of ruby perform significantly worse. I know this is a tough question to answer, but what things should I look into in order to track down why the performance has suffered so much? edit I just attempted to install with ruby-build and the version installed was fast. Something rvm is doing to build it in my environment is slow.

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  • SSH: one user logs in, other don't

    - by Co Lega
    Some users can ssh correctly, others don't. I have an admin user, which is in wheel. I used vsftpd for allowing FTP. I created a nologin user for FTP. Call this user "ftpuser". Now I want to allow sftp. It allows me to connect using admin user. I remove the nologin, by giving the user a shell via usermod -s /bin/bash ftpuser. It still doesn't allow me to connect from the ftpuser via sftp. The content of /home/ftpuser/.ssh is just the known_hosts file which contains "localhost" entry only. User permissions are (in theory) ok: ls -la /home working (admin) : drwx------ 18 admin admin 4096 Feb 6 15:33 admin non-working(ftpuser): drwx------ 3 ftpuser ftp 4096 Mar 26 15:25 ftpuser I haven't configured anything special on openssh. Does the ftpuser need anything extra than shell to enter via ssh?

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  • How to forward connection from one interface to another under linux

    - by Daniel
    Hi, I have linux box which has two network interface, eth0, eth1. from eth1 I can access an internal website, say under port 8080. from outside the box, I can't access that network. my question is, is there a way I set up something so from outside the box, there appears to be a web server running in port 8080 and when I connect to it, it automatically forwards to eht1 the internal site? I tried to enable ip forward and add a static route, but it doesn't work. thanks.

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  • Could one hypothetically upgrade a computer from Windows 95 to Windows 8

    - by JMK
    Hypothetically, could you start with a computer running Windows 95, upgrade this to Windows 98, then upgrade this to Windows XP, then upgrade this to Vista, then to 7 and finally to 8 (consumer preview)? What state would the OS be in after so many upgrades? Would any of the native Windows 95 apps still be sticking around in Windows 8? Has anybody done anything like this before? I don't need to do this, I am just asking out of curiosity! Thanks

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  • How to migrate WinXP from failing old HD to new one

    - by Péter Török
    Following this issue, we have all our important data backed up now. I also bought and installed a new replacement hard disk (WD 160GB PATA) as secondary (slave) drive. I created two primary NTFS partitions on it: a 40 GB system partition, and a 110GB data partition. In theory I could start reinstalling WinXP from scratch on the new system partition, then copying over all user data from the old drive to the new data partition. Once this is done, I could even throw away the old drive, or keep it just to see what happens. (Note: I don't want to clone the whole drive as it contains a dual boot setup with an old Linux installation which I don't need anymore, and anyway, a fresh reinstall would do WinXP good to get rid of many years' clutter.) However, I am lazy :-) The old HD is still functioning, the problem has not manifested again since. So I feel there is no need to hurry with a complete OS reinstall. What I don't know though is whether I will be able to install WinXP on the new system partition at a later stage without affecting the contents of the data partition on the same drive. If this is possible, I can just move over all our data to the new data partition to have it safe, then continue running WinXP from the old drive as long as it works. Does anyone see any problems/risks with this plan?

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  • How To: Transfer Categories in Outlook 2007 from One Installation to Another Using Google Sync

    - by nicorellius
    I use Outlook 2007 for email. I also happen to use the categories for organizing my mail. This function is cool, because you can use keyboard shortcuts that make categorizing mail quick and easy. The problem I am having is that, since I use Google Apps Sync at home and at work, I can't seem to figure out how to transfer the existing category assignments that I spent months creating at work. As my email comes and goes, I assign this and that, with thousands of messages all belonging to specific categories. When I finally installed and started using Google Apps Sync at home, the synchronization process works great, but all my messages are blank, i.e., don't have the color categories I assigned at work. What's worse, I actually changed computers at work, and now am facing the same problem on the new workstation. Using: Windows XP Pro, Outlook 2007, Google Apps. Anyone run into this and find a solution?

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  • ssh many users to one home

    - by filippo
    Hiya, I want to allow some trusted users to scp files into my server (to an specific user), but I do not want to give these users a home, neither ssh login. I'm having problems to understand the correct settings of users/groups I have to create to allow this to happen. I will put an example; Having: MyUser@MyServer MyUser belongs to the group MyGroup MyUser's home will be lets say, /home/MyUser SFTPGuy1@OtherBox1 SFTPGuy2@OtherBox2 They give me their id_dsa.pub's and I add it to my authorized_keys I reckon then, I'd do in my server something like useradd -d /home/MyUser -s /bin/false SFTPGuy1 (and the same for the other..) And for the last, useradd -G MyGroup SFTPGuy1 (then again, for the other guy) I'd expect then, the SFTPGuys to be able to sftp -o IdentityFile=id_dsa MyServer and to be taken to MyUser's home... Well, this is not the case... SFTP just keeps asking me for a password. Could someone point out what am I missing? Thanks a mil, f. [EDIT: Messa in StackOverflow asked me if authorized_keys file was readable to the other users (members of MyGroup). Its an interesting point, this was my answer: Well, it wasn't (it was 700), but then I changed the permissions of the .ssh dir and the auth file to 750 though still no effect. Guess it's worth mentioning that my home dir ( /home/MyUser) is also readable for the group; most dirs being 750 and the specific folder where they'd drop files is 770. Nevertheless, about the auth file, I reckon the authentication would be performed by the local user on MyServer, isn't it? if so, I don't understand the need for other users to read it... well.. just wondering. ]

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  • Combining multiple queries in one in Access

    - by Arlen Beiler
    I have two queries that I want to combine into one in Microsoft Access 2003. SELECT AttendanceQuery.AttendDate, Count(*) AS Absent FROM AttendanceQuery WHERE (((AttendanceQuery.Present)=False)) GROUP BY AttendanceQuery.AttendDate; SELECT AttendanceQuery.AttendDate, Count(*) AS Enrollment FROM AttendanceQuery GROUP BY AttendanceQuery.AttendDate; The one shows the total records for each date, the other shows the ones that are marked absent.

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  • How to logon to a non-domain computer from one in a domain

    - by Svish
    I've met a rather annoying problem that should be very simple, but I can't seem to figure it out. I have a work laptop that is part of a domain, so my username is foobar\bob. I also have my home computer with no domain, just the username bob. I'm trying to connect to a share on my home computer from my work computer. It's asking me for my username and password, which is bob, but when I type in bob it assumes I mean foobar\bob, which of course doesn't work. I've tried to use hostname\bob, but that doesn't seem to work either... What can I do here? Both computers are running Windows 7.

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  • Google and Gmail only work on one laptop and not the other two

    - by Becca
    We have Comcast internet and everything was fine until recently. I am currently using my father-in-law's PC, and Gmail, Paypal, and Google all work fine. They don't work on my laptop or my husband's. We've reset the router/modem several times and nothing works. So we unplugged the main line outside and it fixed it for two weeks but now it's back to being stupid again. We've tried everything else and nothing seems to work. Any ideas?

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  • copy large LVM volume(14TB) from one server to another

    - by bruce
    recently,I have to copy a very large LVM volume()rom server A to server B. Below is the filesystem of server A and server B - server A [root@AVDVD-Filer ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_avdvdfiler-lv_root 16T 14T 1.5T 91% / tmpfs 3.0G 0 3.0G 0% /dev/shm /dev/cciss/c0d0p1 194M 23M 162M 13% /boot /dev/mapper/vg_avdvdfiler-test 2.3T 201M 2.1T 1% /test /dev/sr0 3.3G 3.3G 0 100% /mnt server B [root@localhost ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup-LogVol00 20G 2.5G 16G 14% / tmpfs 3.0G 0 3.0G 0% /dev/shm /dev/cciss/c0d0p1 194M 23M 162M 13% /boot /dev/mapper/VolGroup00-LogVol00 16T 133M 15T 1% /xiangao/lv1 /dev/mapper/VolGroup00-LogVol01 4.7T 190M 4.5T 1% /xiangao/lv2 I want to copy LVM volume /dev/mapper/vg_avdvdfiler-lv_root on server A to LVM volume /dev/mapper/VolGroup00-LogVol00 on server B . The server A and server B is in the same IP segment. IN the LVM volume on server A , there is all average 500M avi wmv mp4 etc. I tried mount /dev/mapper/vg_avdvdfiler-lv_root on server A to server B through NFS , then use cp command copy. It is clear I faild . Because the LVM volume is too big , I do not have good idea . I hope a good solution here. I'm a chinese, my english is very pool. sorry thanks everyone!

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  • Monitoring instantaneous network throughput at one second intervals?

    - by Shaddi
    For a testing setup I have, I need to monitor the throughput through a "router"* at regular intervals of around 5 seconds or less (sub-second intervals would be very nice, but not required). Ideally, I would be able to generate a file which contained both the number of bytes and packets seen during each interval. I will eventually be generating a time-series of throughput from this data. On a previous setup using an older version of FreeBSD, there was a tool called "bpfmon" which gave me this information. However, I need to do this under a modern version of Linux (namely, Ubuntu 11.04). I have looked at both iptraf and iftop, but these do not appear to provide the resolution I need, nor do they seem to easily allow scraping the data I need. I understand iptables statistics may be able to give me what I'm after, but the examples I've seen of this seem to rely on repeatedly reading and resetting traffic counters, which seems like it could give inaccurate as read/reset is not an atomic operation. I already capture a tcpdump trace of the traffic I'm interested in on the link I want to monitor, so I am open to approaches which simply parse that. I feel like this must be a common problem though, so I am hoping there will be a standard "best practice" tool for accomplishing this. *I say "router" in quotes because I am really talking about a machine with two bridged NICs through which all the traffic I'm interested in passes.

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  • How to re-run one line of a PowerShell cmdlet if it fails

    - by pansal
    I wrote a PowerShell script which is supposed to send emails automatically, but sometimes the email won't send out due to a network issue. Here is how I'm sending email: $smtp_notification.Send($mail_notification) Here are the error logs: Exception calling "Send" with "1" argument(s): "Failure sending mail." At line:1 char:24 + $smtp_notification.Send <<<< ($mail_notification) + CategoryInfo : NotSpecified: (:) [], MethodInvocationException + FullyQualifiedErrorId : DotNetMethodException Is there anyway to re-run the sending line when I met this failure? Can anyone give me some suggestions please?

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  • Free alternatives to vSphere for ESXi (if one exists)

    - by Tim
    Dear All, Am feeling a touch confused and overwhemled. From what I gather even though ESXi is free I will only be able to manage my VMs (create or power on etc) for 60 days unless I buy a licence for vSphere. This is somewhat frustrating. As I am looking for a home lab to practice for various certs I was hoping to also practice using vmware stuff to do so. Have I got the wrong end of the stick? Is there a free built in web interface like there was with VMServer or is the only option vSphere (which is massively out of my price range)? Looking forward to your responses and hoping that I have just missed something obvious! Regards Tim

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  • Nginx vs Apache as reverse proxy, which one to choose

    - by mhd
    Hi, this kind of question maybe has been asked here but I couldn't find any that really match my question. Heard that nginx performance is quite impressive, but Apache has more docs, community(read:expert) to get help Now what I want to know, how both web servers compare in term of performance, easiness of config, level of customization,etc. AS REVERSE PROXY server in a vps environment?? I'm still weighing between the two for a ruby web app(not ROR) served with thin server. Specific answer will be much appreciated. General answer not touching the ruby part is okay. I'm still noob in web server administration.

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  • Exchange 2010 Multiple accounts in one mailbox

    - by durilai
    I am looking for best practice or recommended ways of doing the following: I have a user that has 2 email addresses, he accesses them via POP 3 and OWA. He need to be able to send as each of the addresses. I do not want to create multiple AD accounts or mailboxes, but would like to be able to provide that visual separation. Is this possible, I know using Outlook I am able to add multiple POP3 accounts and he can send from whichever he choose, but how to enable this is OWA, as well as on a mobile using POP3. Thanks

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  • Can you give one directory two SELinux Policies?

    - by Mike
    Out of laziness I want to be able FTP into my WWW directory. However, the SELinux permissions for apache(user_u:object_r:httpd_sys_content_t) to be able to use the WWW directory and for the user(system_u:object_r:user_home_dir_t ) to use the WWW directory are different. Anyway, around this problem without disabling SELinux? Thanks.

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  • mysql and indexes with more than one column

    - by clarkk
    How to use indexes with more than one column The original index has an index on block_id, but is it necesarry when it's already in the unique index with two column? Indexes with more than one column (a,b,c) you can search for a, b and c you can search for a and b you can search for a you can not search for a and c Does this apply to unique indexes too? table id block_id account_id name indexes origin PRIMARY KEY (`id`) UNIQUE KEY `block_id` (`block_id`,`account_id`) KEY `block_id` (`block_id`), KEY `account_id` (`account_id`), indexes alternative PRIMARY KEY (`id`) UNIQUE KEY `block_id` (`block_id`,`account_id`) KEY `account_id` (`account_id`),

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