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• Analyze a wireless network that constantly drops/has speed issues

  - by Eddie Parker

  Hello, I'm curious what the best tools are to use for analyzing problems with a WiFi network. Here's the scenario: I have a WiFi router (Belkin N+) that's setup in AP mode. I have three RT-N13U's that I've purchased to use as 'repeaters', but I've had so many problems when more than one of them is running (bad routes) that I've only got one active. Sometimes certain boxes on my network can't talk to others, and drops are quite frequent and quite aggravating. I'm running Mac, Windows, and Linux (Gentoo) boxes on this network, so any software, or steps I should take that work for any of those boxes should be sufficient. Apologies if this is answered somewhere else - I'll close it as a dupe if so.

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• How can I stop my laptop display from flickering when I connect my TV?

  - by Lord Torgamus

  I have a laptop with an HDMI output port running Vista, and an HDTV with HDMI input ports. The laptop is set to extend its desktop onto a second monitor. When I connect the computer to the TV with an HDMI cable, my laptop screen usually flickers rapidly. Most of the time it lasts for about 30 seconds, but sometimes it lasts for several minutes and once in a while it doesn't happen at all. It wouldn't be so bad except that the cursor moves back to the center of the laptop screen with each flicker, so I can't really do anything until the machine decides it's ready to calm down. I haven't been able to find any pattern at all for the causes or duration of the flickering. It doesn't seem to matter what programs the laptop is running when I connect it to the TV, whether I enable the extended display before or after I connect the TV or which HDMI port/cable I use. What could be causing this, and how can I make it go away?

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• Does Dynamic DNS require separate subdomains?

  - by kce

  Hello. I have a functioning DHCP/DNS (ISC Bind 9.6, DHCP 3.1.1) server running on Debian that I would like to add DynamicDNS functionality to. I have a pretty simple question: Does DynamicDNS require (or recommend) separate sub-domains? I have seen a few tutorials where the the clients that are acquiring their IP addresses and other networking information via DHCP are on a different sub-domain as the servers which are statically configured (both in terms of IP, and DNS). For example: All the clients are on ws.example.org and the servers on example.org. Right now all of our servers and clients are in the same domain (example.org) but spread across different zone files (because we have multiple subnets). The clients are configured with DHCP and the servers are configured statically. If I want to setup DynamicDNS for the clients should I use a separate sub-domain? What's the best practice here (and why or why not would it be a bad idea to do otherwise)? Thanks.

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• PS/2 vs USB keyboards: performance and energy consumption

  - by Mister Smith

  As far as I know, PS/2 keyboards are interrupt driven, while USB are polled. Typically a PS/2 keyboard was assigned IRQ_1 on Windows. I'm no hardware expert, but at a first glance seems like the PS/2 keyboards are more efficient. So here are my questions: On modern day computers, are PS/2 keyboard better (or faster), and if so, would it be noticeable at all? (e.g.: in gaming) Since they don't need polling, do PS/2 keyboards save energy compared to USB? (notice I'm not talking only about the peripheral here, but about the overall computer energy consumption). In case PS/2 had any advantage over USB, would adding a PS/2 adapter to my USB keyboard make the device as good as an actual PS/2 keyboard? Conversely, would adding a USB adapter to a PS/2 make it as bad as a USB KB? Thanks in advance.

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• How to install Oracle's exp / imp binaries

  - by Sotapanna

  I was browsing the net to find a solution, but I had no luck. :( How can I install Oracle's imp / exp binaries to my CentOS box without installing an Oracle Server? I'm accessing an existing Oracle database on another machine, so I only need a client here. I already installed sqlplus and its dependencies (oracle-instantclient11.2-basic-11.2.0.3.0-1.x86_64.rpm, and oracle-instantclient11.2-odbc-11.2.0.3.0-1.x86_64.rpm), but that didn't provide those tools. Do I really need to fully install Oracle? My aim is to suck a database dump from the Oracle to my CentOS box. If there is another way to do this without using exp I wouldn't feel bad about NOT using it, but it seems to me there is no alternative.

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• Pros/cons to turning off cable modem

  - by Jay

  A little off the wall perhaps, but ... I have a cable modem and a router for a wireless home network. Is it a good or a bad idea to turn it off at night and during the day when we're all at work or school? Or should I leave it on 24/7. I was thinking that leaving it on constantly makes me more vulnerable to hackers, not to mention wasting electricity. (Though I'd guess the amount of electricity used by a cable modem and a router is probably pretty trivial. Still, every little bit helps.) When I have turned it off and turned it on again, it takes several minutes for it to go through its little dialog with the cable company and get me connected to the Internet again, which is annoying but not a big deal. Anyone know any good reasons one way or the other?

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• Database modularity with EBS volumes

  - by Eclyps19

  I would like to add modularity to my websites on EC2 instances by encapsulating the site files and the mysql files in their own EBS volumes. The end result that I'm going for is the ability to quickly mount a volume or two to different servers running the same AMI (for testing/development/emergency maintenance, etc), as well as maintain separate snapshots of each. I'm able to do this fairly easily with a single database by symlinking my mounted database EBS to the appropriate places (/var/lib/mysql, /etc/my.cnf, /var/log/mysqld.log), but I'm not sure if it would even be possible be possible to have multiple databases on different EBS volumes running concurrently. Example: /website1/www.website.com /database1/ /website2/www.otherwebsite.com /database2/ Could anybody shed some light on this for me? Is it possible? Is it a bad idea? Thanks.

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• Is a cluster the most cost effective redundancy method for windows server 2003?

  - by Ryan

  We had a server with bad ram which caused a long outage while they figured it out and our client facing apps had to go down for a while. We are coming up with a solution for instant fail-over but are not sure what the most cost effective method would be. Is a windows server cluster the best method for this? Also note we are using Parallels Virtuozzo if that makes any difference here. We found Parallels has a documented method for setting this up but it said it required a Domain Controller as well as a Fiber connection to shared storage, is all that really needed? Thanks.

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• Implementing a form of port knocking + Phone Factor = 2 Factor auth for RDP?

  - by jshin47

  I have been looking into how to secure a publicly-available RDP endpoint and want to implement our two-factor authentication RADIUS server, PhoneFactor. I would like to implement the following process: User opens up web app in browser In web app, user enters username + password, initiates RADIUS auth Phone factor calls user to complete auth Once user is authenticated, port 3389 is opened on user's IP on pfSense firewall. After some amount of time, firewall rule is removed for that IP I would like to know the following: Is this a typical setup? If it is a bad idea, please explain why. If it is possible, are there any packages that assist with this? Specifically, the third step, where the appropriate firewall rule would need to be added... Edit: I am aware of TS Web Gateway, but I want the users to be able to use the traditional RDP client...

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• IIS 7 + ASP.NET 4

  - by user26712

  Hello, I have an ASP.NET application that I am trying to convert to an ASP.NET 4 application. The application is fairly simple. I have created a new web application in IIS 7.5 pointing to the directory that the ASP.NET application exists in. When I attempt to execute the application, but entering http://localhost%3A%5Bport%5D into my browser, I receive the following error: Error Summary HTTP Error 500.21 - Internal Server Error Handler "PageHandlerFactory-Integrated" has a bad module "ManagedPipelineHandler" in its module list Most likely causes: * Managed handler is used; however, ASP.NET is not installed or is not installed completely. * There is a typographical error in the configuration for the handler module list.

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• is it worth defragging an iPod

  - by alimack

  Essentially my 5G iPod was cutting tracks off and generally misbehaving. So I did the following: 1) Use Diskwarrior - heavy directory fragmentation which it fixed; 2) Use iDefrag - some fragmentation but it kept halting as it couldn't move files; 3) Try to write out drive with Disk Utility - got a warning from DU so gave up before I started; 4) Completely restored using iTunes; 5) Reran Diskwarrior - still heavy directory fragmentation; 6) Reran iDefrag, still fragmentation although limited to two bands; The iPod is much quicker to traverse menus and no more track skipping. My question is this - is defragging worth it or does the heat generated by the process kill the drive and make it a self-defeating process. Anyone have any metrics/ figures? Clearly it's a bad idea for solid state drives like the nano & touch.

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• How to format HDD with MHDD Tool.

  - by PP

  I have copied MHDD application on a bootable CD and i wan to use it to low level format my HDD which had some bad sectors on it. so how can mark these badsecotrs using MHDD application? Pluse can i partition/format my HDD using MHDD because after low level format i want to setup window xp on that drive. can some one explain me step by step procedure to how to lovel format driven and partition/format it and then setup xp on that. Link to MHDD app. http://hddguru.com/content/en/software/2005.10.02-MHDD/ Thanks, PP.

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• Does anyone use the L-Track trackball?

  - by thethinman

  I've been using the Logitech Trackman Marble Mouse for years. Now I'm looking for a trackball with a scroll wheel, larger and heavier ball, and preferably rollers instead of pins. It must be finger (not thumb) operated. The Kensington Expert Mouse is close, but from what I've read the scroll wheel is poorly implemented. They also switched from rollers to pins. I bought a Kensington Orbit Trackball and it's not bad but the scroll wheel is rough and the ball is the same as the marble mouse. I'm still looking for something better. I found the L-Trac and it looks good but there's little info on the web. Has anyone used it and can provide their impressions? Or can you point out another option?

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• Postfix TLS issue

  - by HTF

  I'm trying to enable TLS on Postfix but the daemon is crashing: Sep 16 16:00:38 core postfix/master[1689]: warning: process /usr/libexec/postfix/smtpd pid 1694 killed by signal 11 Sep 16 16:00:38 core postfix/master[1689]: warning: /usr/libexec/postfix/smtpd: bad command startup -- throttling CentOS 6.3 x86_64 # postconf -n alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases broken_sasl_auth_clients = yes command_directory = /usr/sbin config_directory = /etc/postfix daemon_directory = /usr/libexec/postfix data_directory = /var/lib/postfix debug_peer_level = 2 disable_vrfy_command = yes home_mailbox = Maildir/ html_directory = no inet_interfaces = all inet_protocols = all local_recipient_maps = mail_owner = postfix mailbox_command = mailq_path = /usr/bin/mailq.postfix manpage_directory = /usr/share/man mydestination = $myhostname, localhost.$mydomain, localhost mydomain = domain.com myhostname = mail.domain.com mynetworks = 127.0.0.0/8 myorigin = $mydomain newaliases_path = /usr/bin/newaliases.postfix queue_directory = /var/spool/postfix readme_directory = /usr/share/doc/postfix-2.6.6/README_FILES relay_domains = sample_directory = /usr/share/doc/postfix-2.6.6/samples sendmail_path = /usr/sbin/sendmail.postfix setgid_group = postdrop smtp_tls_note_starttls_offer = yes smtp_tls_session_cache_database = btree:/var/lib/postfix/smtpd_tls_cache.db smtp_use_tls = yes smtpd_delay_reject = yes smtpd_error_sleep_time = 1s smtpd_hard_error_limit = 20 smtpd_helo_required = yes smtpd_helo_restrictions = permit_mynetworks, reject_non_fqdn_hostname, reject_invalid_hostname, permit smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_pipelining, reject_non_fqdn_recipient, reject_unknown_recipient_domain, reject_invalid_hostname, reject_non_fqdn_hostname, reject_non_fqdn_sender, reject_unknown_sender_domain, reject_unauth_destination reject_rbl_client cbl.abuseat.org, reject_rbl_client bl.spamcop.net, permit smtpd_sasl_auth_enable = yes smtpd_sasl_local_domain = $myhostname smtpd_sasl_path = private/auth smtpd_sasl_security_options = noanonymous smtpd_sasl_type = dovecot smtpd_sender_restrictions = permit_mynetworks, reject_non_fqdn_sender, reject_unknown_sender_domain, permit smtpd_soft_error_limit = 10 smtpd_tls_CAfile = /etc/postfix/ssl/cacert.pem smtpd_tls_cert_file = /etc/postfix/ssl/smtpd.crt smtpd_tls_key_file = /etc/postfix/ssl/smtpd.key smtpd_tls_loglevel = 1 smtpd_tls_received_header = yes smtpd_tls_session_cache_timeout = 3600s smtpd_use_tls = yes tls_random_source = dev:/dev/urandom unknown_local_recipient_reject_code = 550

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• Can using higher rated battery damage device?

  - by Anwar Shah

  I am in need of a battery for my Lenovo 3000 Y410 Laptop. It's installed battery has voltage rating of 10.8v. But the shop i've consulted has only a battery of 11.1v rating. Should I buy the battery? I mean, Does using that battery can damage my laptop? An answer with some good source from hardware vendor will be very much helpful. Please do not just put your opinion. Because I do not see any difference in your opinion and my opinion. My opinion is also "It is bad". But I need some reliable source.

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• I want to install an MSI twice

  - by don.vince

  I have a peculiar wish to install an msi twice on a machine. The purpose of the double install is to first install under the pre-production folder, run the deployment in a safe environment prior to deploying in the production folder. We typically use separate machines to represent these different environments however in this case I need to use the same box. The two scenarios I get are as follows: I've installed pre-production, I'm happy, I want to install production, I run the msi, it asks whether I want to repair or remove the installation I've production installed, I want to install the new version of the msi, it tells me I already have a version of the product installed and I must first un-install the current version The first scenario isn't too bad as we can at that point sensibly un-install and re-install under the production folder, but the second scenario is a pain as we don't want to un-install the live production deployment. Is there a setting I can give to msiexec that will allow this? Is there a more suitable different approach I could use?

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• How do I identify which rewrite rule is being trigger on IIS 7.5?

  - by Jordan Reiter

  I have a set of rewrite rules (offhand, I would say around 40-50) for a given server. It's basically to handle and reroute mangled URLs so that bad links still go to where they're supposed to go. I've come across an URL that is redirecting and I can't figure out which rewrite rule it is applying. My background is Apache and in that case I'd simply enable a rewrite log and look at the logged output to figure out what was happening. Is there an equivalent way to do this in IIS? bonus round Any way for me to view & edit the rewrite rules in a text file rather than the GUI interface?

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• How do you test if a PCI slot is working - motherboard diagnostic software?

  - by Adam

  I suspect that my motherboard is bad, and that my PCI-E slot is not working. I have a Gigabyte motherboard that had a Hauppage 2250 working fine in the PCI-E slot for many months. However - recently - would not get TV channels that I used to get --- until finally Media center cant detect any channels at all. Got a new tuner card (ATI 350 card) - cant detect any channels. The cable signal is good - I have it connected directly to a TV - all channels come in clear. SO that is why I suspect a motherboard problem. Are there any motherboard diagnostic scanner utilities that can verify I need a new motherboard

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• IP camera's multicast/RTSP conflicting with 2.4GHz Wi-Fi?

  - by jayson

  Here at our business we have a Netgear R7000 running DD-WRT. I have been slowly adding IP cameras which I run using Blue Iris software. The last camera I bought (which is NOT a wireless camera), when I plug it into the network I start having really bad connection issues on the 2.4GHz Wi-Fi network. The 5GHz works fine, just the 2.4GHz all of the sudden has trouble connecting, as if it's conflicting. I've tried playing with the camera settings, different IP addresses, HTTP ports, etc, and discovered it to be a conflict with multicast. When multicast is checked, the Wi-Fi has issues but my video streams via Blue Iris. When unchecked, Wi-Fi works fine but the video won't stream through Blue Iris. The problem is there are no settings in the camera to change the RTSP port, which is set to 34567. Does anyone know something that could fix this issue? It all seems very strange to me but maybe someone has an idea?

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• Horrible performing RAID

  - by Philip

  I have a small GlusterFS Cluster with two storage servers providing a replicated volume. Each server has 2 SAS disks for the OS and logs and 22 SATA disks for the actual data striped together as a RAID10 using MegaRAID SAS 9280-4i4e with this configuration: http://pastebin.com/2xj4401J Connected to this cluster are a few other servers with the native client running nginx to serve files stored on it in the order of 3-10MB. Right now a storage server has a outgoing bandwith of 300Mbit/s and the busy rate of the raid array is at 30-40%. There are also strange side-effects: Sometimes the io-latency skyrockets and there is no access possible on the raid for 10 seconds. The file system used is xfs and it has been tuned to match the raid stripe size. Does anyone have an idea what could be the reason for such a bad performing array? 22 Disks in a RAID10 should deliver way more throughput.

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• How can I set the fan speed to 100% on a laptop?

  - by Codemonkey

  I recently purchased a HP Pavilion dv7-4031. When it's cool, it works smoothly and efficiently. However when CPU and GUP temperatures reach 60c and above, the PC starts freezing up and stuttering. I can hear that the fan speeds steadily increase all the way up to 70-80c. This is what pisses me off: I want the fan speeds to run 100% all the time, perhaps preventing the high temperatures in the first place. The way it is now, fan speeds only increase to keep internal temperatures at above 60c. I've searched all over for any sort of speed control, finding nothing. Any help appreciated. I have tried Speedfan. In "Fans" there is nothing listed. I took that as a bad sign. The BIOS is pathetic, and only has 4 or 5 changeable settings, including "Quickstart" and "Boot order"

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• Writing my first bash script (line 2: testscript: No such file or directory)

  - by skyeagle

  I am attempting to write my first shell script (I'm running Ubuntu 10.x) This is what my 'script' looks like cd /path/to/directory/cronscripts . testscript I put the following debug statements (after the cd), in the script above to make sure everything was ok: pwd echo `ls -lhrt` and it displayed all the files in the directory. So I dont understand the error message I am getting. I have the following two questions Why am I getting the above error message and how do I fix it? My script seems to run fine without a shebang in the first line - infact when I try either of the following: #!/usr/bin/bash #!/usr/bin/bash env I get the following error message: /usr/bin/bash: bad interpreter: No such file or directory What is the purpose of the shebang statement and why do I get the above error when I try to include it in my script/ how do I fix it, so I can add the shebang (is it necessary? - it seems most script examples have the shebang - but I'm not sure if it is a must, as the script runs without it).

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• Windows - Delayed Write Failed error on USB hard drive

  - by ndngrd

  I've got a new Verbatim 1.5TB USB hard drive (Samsung HD154UI) and I'm finding myself completely unable to fill it. I'm using Windows XP. Whenever I try to copy a load of files over, it works for some time (will copy over between 20 and 90GB) but eventually stops with an error saying "The specified path is too deep" - the specified is not too deep, there's nothing more than 2 dirs deep that I'm copying. A balloon pops up at the bottom saying "Windows - Delayed Write Failed" telling me the data could not be copied. This wouldn't be too bad if I could just restart the transfer, but after this error has happened I can't write anything else to the disk - including if I eject it and then connect it to another machine. It just seems completely locked. The only way I can unlock it is to delete everything that I was copying to it. I've tried various USB cables and copying from different machines, and the same thing keeps happening.

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• What ports does Advantage Database Server need?

  - by asherber

  I have an application which uses ADS and I am attempting to deploy it in a Windows network environment with a rather restrictive firewall. I am having a problem configuring firewall ports appropriately. ADS lives on \\server, and it's listening on port 1234. When \\client tries to connect to \\server\tables, I get Error 6420 (Discovery process failed). When \client tries to connect to \\server:1234\tables, I get error 6097, bad IP address specified in the connection path. \\server is pingable from \\client, and I can telnet to \server:1234. If I try to connect from a client machine inside the firewall, either connection path works fine. It seems there must be something else I need to open in the firewall. Any ideas? Thanks, Aaron. Edit: I should have specified that the firewall is open to \\server:1234 specifically for TCP traffic. Is UDP involved here in some way?

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• Leaving my wifi open for the world

  - by Thomaschaaf

  For my home I want to be a nice neighbor actually I have let my wifi open for the past maybe 6 or 7 years. I know that WEP, etc can be cracked within a couple of minutes but my neighbors son who works in IT told his mom and she told me that I am doing bad things and you know the story.. Do you think it's okay to leave your wifi open to the public? I live in a suburb with a tiny street and about 8 houses in reach of my wifi. I have a 16k DSL line so if some one joins me for a couple hours I would probably not notice. I would love your thoughts on whether I should encrypt my wifi or not.

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