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• Explanation of nodev and nosuid in fstab

  - by Ivan Kovacevic

  I see those two options constantly suggested on the web when someone describes how to mount a tmpfs or ramfs. Often also with noexec but I'm specifically interested in nodev and nosuid. I basically hate just blindly repeating what somebody suggested, without real understanding. And since I only see copy/paste instructions on the net regarding this, I ask here. This is from documentation: nodev - Don't interpret block special devices on the filesystem. nosuid - Block the operation of suid, and sgid bits. But I would like a practical explanation what could happen if I leave those two out. Let's say that I have configured tmpfs or ramfs(without these two mentioned options set) that is accessible(read+write) by a specific (non-root)user on the system. What can that user do to harm the system? Excluding the case of consuming all available system memory in case of ramfs

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• BES 5.x issues when connecting to Exchange 2010 SP2 RU4

  - by makerofthings7

  Ever since we updated from SP1 RU4 to SP2 RU4 we have noticed that our BES devices will simply stop receiving email. This has occurred at least 5 times in the past few weeks. Today, while speaking with RIM support (a T3 contract), they said that they have reports of sporadic connectivity issues from some BES users. This has been occurring with Exchange 2010 SP2 RU4, and have no public information to give us. We were able to temporarily get things running by doing any or all of the following Restart the BES server Recreate the MAPI profile (deleted the keys in the registry) Restart the CAS servers Wait it out (2 hours) What other options should I take to resolve this issue?

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• Can I mix CAT5 and CAT6?

  - by Jason94

  I'm thinking of upgrading the "backbone" of my network, taking a CAT6 cable from my router (DLINK DIR-655 (has cat6 ports)) to a gigabit swith in the tv rom (25m). I have two devices there that uses network (xbox and tvbox, both of them have cat5). Will my net be downgraded to 100mbit as max speed, or will I get 1 gigabit between my router and switch, and 100mbit between tvbox and xbox? From back in the days i have a tool to create my cat5 cable (the plug tool thingy), can I use this for my cat6 too?

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• Why is my laptop only producing sound when the headphones should be active?

  - by Telos

  I think Skype may have corrupted my laptop speakers somehow. The other day I was listening to music on my headphones when a coworker started sending me IMs. Whenever the alert sound played, the music and alert would both come out through the laptop speakers for a second instead of the headphones. Now sound only comes out through the speakers when skype is playing sounds, or if I right click the volume control, select Playback Devices and test the headphones. So if I play music it's silent. If I go into Skype and dial the sound test call the music will start coming through the speakers. Any ideas how to fix this? Win7 by the way.

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• Can a Mac Mini Server and XCode be used for multiple students?

  - by twerdster

  I'm not an administrator but Ive been given the task of finding out whether this is possible. The scenario is like this: At our university we are offering a course in basic iPhone programming for between 4 to 8 groups of students. We have a few iPads, iPods and iPhones but only two Mac Minis. We want to enable the students to work on XCode in the lab (and from home if possible) without buying 8 Mac Minis. Is this possible to do using a Mac Mini Server? If so how would it work if 2 or more groups want to use XCode simultaneously and to debug their programs on devices simultaneously?

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• Why is my ethernet interface in promiscuous mode

  - by nhed

  I read that seeing a flag of M in netstat -i is the way to tell which of your interfaces is in promiscuous mode I run it and I see that eth1 is in promiscuous mode $ netstat -i Kernel Interface table Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg eth1 1500 0 1770161198 0 0 0 57446481 0 0 0 BMRU lo 16436 0 97501566 0 0 0 97501566 0 0 0 LRU This seems to be the case on all the machines I checked (All Centos6.0, both virtual and physical), any idea why ethernet devices would be in such a mode unless someone was running any pcap based app (sudo lsof | grep pcap shows nothing)? I did not see any mention of promiscuous in any of the config files (sudo grep -r promis /etc) Any ideas what puts the interface into that mode and why? p.s. most of the posts I see seem to be security related, this is not that

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• solaris + EMC + power-path

  - by yael

  please advice - when I run powercf command on my Solaris machine , which changes this command do on the EMC storage , or on Solaris file system ? from maanual page: DESCRIPTION During system boot on Solaris hosts, the powercf utility configures PowerPath devices by scanning the HBAs for both single-ported and multiported storage system logical dev- ices. (A multiported logical device shows up on two or more HBAs with the same storage system subsystem/device identity. The identity comes from the serial number for the logical device.) For each storage system logical device found in the scan of the HBAs, powercf creates a corresponding emcpower device entry in the emcp.conf file, and it saves a primary path and an alternate primary path to that device.

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• Emulate a USB port as a USB flash drive?

  - by Wilco

  Does anyone know of any software that can emulate a USB flash drive through an available USB port in OS X? Perhaps some way to map a directory to a USB port that could then be connected to another device that supports reading USB storage devices? I'd love to connect my laptop to my car's USB port and access files as if it were a USB drive. I know about the target disk mode with firewire (not sure if this is also supported over USB), but I was hoping for something that doesn't require booting outside of the OS (I want to retain use of the machine). Any ideas?

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• Using iTunes within Terminal Services 2008 R2 - Pitfalls etc

  - by Kristiaan

  I was hoping to get some further information on any possible Do's and Don't when it comes to installing, using and maintaining iTunes within a Termina Server environment. We have come across a situation in our company whereby some of our users who are using thin clients now need the ability to sync, update and manage their devices, previously they used either standard desktop systems or laptops so there was no issue with running iTunes. I have not found much information on the web about using iTunes within a Terminal Server Farm, Id like to find out if iTunes works within the environment, any known or common issues that occur due to running it like this.

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• Suggestion of device WiFi range in it's spec. Possible?

  - by SeeR

  I have router Draytek Vigor 2100VG at home almost in the center of it. The farthest point at my home is my balcony, ~12m from it. I have constant wifi signal range problems with some of my devices, but not with others. Notebook Lenovo W510 - no problems Nokia Home Music - always on 10m - no problems Sony PS3 - always on 7m - no problems Sony tablet S - problems around 6m Sony PSP - problems around 8m Sony PS Vita - problems around 8m Nokia E63 - problems around 8m I'm curious why my Notebook don't have any problems even on the balcony? I guess it has better hardware or uses more power for transmission. This information is really important when you want to buy new device/computer, so my real question is: Can device wifi range can somehow be found/suggested from official hardware technical specification? If not Is there some web page with wifi range reviews?

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• Connecting to Aerohive AP's from Laptops running Win. 7 using authentication from a Windows 2008 domain server

  - by user264116

  I have deployed a wireless network using Aerohive access points. 2 of them are set up as radius servers. I want my users to be able to use the same user name and password they use when they log onto our domain. They are able to do this from android devices or computers running Windows 8. It will not work on Windows 7 machines. How do I remedy this situation, keeping in mind that the machines are personal machines not company owned and I will have no way to change their hardware or software.

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• Why are my hardware tabs disabled for my VMWare player image?

  - by djangofan

  I just installed a Ubuntu 10.10 image on VMWare player and after I finished installing I was messing with the hardware settings and I did the following: 1. disabled the floppy device 2. changed the CDRom to "use system cdrom" 3. tried to enable the VMWare tools but it complained that the vm was in "Easy Install" mode After I fiddled with the VM now my floppy and 2 CD rom devices as well as sound card and USB settings are all disabled in the VM hardware settings. Any idea on why this occurred and how to fix it?

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• "Countersigning" a CA with openssl

  - by Tom O'Connor

  I'm pretty used to creating the PKI used for x509 authentication for whatever reason, SSL Client Verification being the main reason for doing it. I've just started to dabble with OpenVPN (Which I suppose is doing the same things as Apache would do with the Certificate Authority (CA) certificate) We've got a whole bunch of subdomains, and applicances which currently all present their own self-signed certificates. We're tired of having to accept exceptions in Chrome, and we think it must look pretty rough for our clients having our address bar come up red. For that, I'm comfortable to buy a SSL Wildcard CN=*.mycompany.com. That's no problem. What I don't seem to be able to find out is: Can we have our Internal CA root signed as a child of our wildcard certificate, so that installing that cert into guest devices/browsers/whatever doesn't present anything about an untrusted root? Also, on a bit of a side point, why does the addition of a wildcard double the cost of certificate purchase?

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• HDD not detected whenever first power on (detected at BIOS level)

  - by Alvin Lim

  I am using Asus P8H61-M LX Motherboard with latest version of BIOS: 4401 One SATA-3 Western Digital Black Series 1.5TB is attached to SATA port 0 A Samsung 22x DVDRW SATA drive attached to SATA Port 1. ps/2 Logitech mouse and keyboard. CPU is i3 with DDR3 8Gb RAM. no other devices are installed. My problem is that when I turn on the computer, the WD HDD is not detected. ie cannot be booted. I have to press ctrl+alt+del in order to get it detected. I'd used the WD data lifeguard software to scan the HDD, the smart status is OK, the surface scan does not show any error at all. Where did I do wrong? Any advice is greatly appreciated.

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• How to batch convert video files on OSX for AppleTV2 / iPhone4?

  - by Luke404

  I'd like to have a solution to batch convert video files to a format suitable for the AppleTV2, iPad2, iPhone4, while at the same time preserving as much quality as possible; I want a single output file that will play on both devices and also good for consumption by other Mac software (eg. Aperture, iMovie, iTunes). Batch processing is a requirement since I'm gonna convert many many files from different sources (mainly lots of videos captured by compact digital cameras, cell phones, and so on). I'm looking into ffmpeg and MEncoder (both installed via MacPorts), but I can't seem to find a suitable preset for libx264 even if everyone out there is talking about them. A different approach involving different software would be ok too as long as I can script it somehow and run it on a whole directory full of files to be converted.

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• Windows 8 Secureboot: How do you bootup from another device such as cd/dvd drive or usb flash etc.?

  - by Victor T.

  On PC's and laptops running an older OS, this is just a simple matter of going into the BIOS and setting the boot sequence and putting the boot cd/dvd in the drive. In many cases you can even just hit one of the F* function keys to bring up the boot sequence menu on-the-fly during POST. The main problem I'm running into is that other devices besides the primary HD is disabled when SecureBoot is enabled. So far the only way I've gotten it to work is to disable SecureBoot and enable something called legacy mode. Needless to say this make it difficult to boot things like OS recovery tools, PartitionHD backups, Linux LiveCD's and a bunch of others. Is there another procedure for doing this since it seems to mess up the Windows 8 install? By mess up I mean that after re-enabling SecureBoot and starting Windows 8 normally, the OS goes into a 'preping repair phase' for some reason that takes forever to complete before getting into a usable desktop.

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• Xen find VBD id for physical disks

  - by Joe

  I'm starting a xen domU using xm create config.cfg. Within the config file are a number of physical block devices (LVs) which are added to the guest and can be accessed fine when it boots. However, at a point in the future I need to be able to hot unplug one of these disks using the xm block-detach command. This command, however, requires the vbd id of the device to be detached and I can't find a way to find the device id for a particular disk 'plugged in' at start up. Any help is much appreciated!

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• Windows 7 random black screen when idle

  - by Omar

  Occasionally, when I'm away from my computer for about 5 minutes, the computer screen will go black and all USB devices (keyboard/mouse) will lose power. Attempting to move the mouse or pressing keys does not 'wake up' the computer. This only started happening a few days ago but I'm not sure what changes I did could have caused this and I uninstalled programs (one by one) I installed before it started happening, but still having the same issue. The one thing I noticed different about my computer since it started happening is i've been getting random survey popups from www.insightexpress.com. I ran Microsoft Security Essentials scan, it picked up some Java related malware, I removed it but still the same issue. I'm running MBAM right now and will run SAS after. Edit: I just updated drivers for motherboard and video card and ran virus scans, still having the same issue.

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• USB-keyboard & mouse powered off in windows-7

  - by sinned

  I have a problem with a pc where usb devices are not getting any power as soon as windows starts up (it works in preboot). This pc has no ps/2, so there is no chance for input, also not in secure boot mode. I "tidied up" using sysinternals autostart, so there is a chance I messed something up here, although I'm quite sure I only deleted some old printer drivers from autostart. I do not know how to reset this, I cant even log in because there is no input possible. I could use a linux live cd, but I don't know what to do there because there is no sysinternals from linux into a not running windows... To make things even worse, I have the windows installation completely encrypted with truecrypt, so I haven't even tried windows recovery cd yet. There is no loss of data since I can access the disc with a live-linux, I only want to use it again without resetting up everything. Any suggestions?

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• Setting up WiFi extenders... is it possible to daisy-chain them?

  - by Bigbio2002

  At a location with limited cabling, I've had to set up WiFi signal extenders to cover the whole area. Here is a crude diagram... Internet - WiFi/Gateway - Extender 1 - Extender 2 | | PC (ethernet) WiFi device I was able to successfully daisy-chain three together, and I can access the internet from WiFi devices connected to the farthest extender. Is this a supported configuration? If not, what kind of issues can arise from it? The reason why I ask is that the PC keeps reporting IP address conflicts, and I'm wondering if that's caused because of the way this is configured. Additionally, I noticed that the extenders named their own SSID similar to the one they are connected to, but with a suffix. Would there be any issue in naming them all with the same SSID, to enable seamless roaming as you would with multiple standalone APs?

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• What are the essential considerations for setting up systems in a location with unreliable power?

  - by dunxd

  I deal with a lot of remote offices located in parts of the world where the local grid power supply is unreliable. Power can go off anytime with no warning, with outages ranging from minutes to days Power fluctuation is wild, with spikes and brown outs Currently the offices will have some or all of the following: A generator, with an inverter, or some sort of manual switch A big UPS or battery array connecting a number of devices Several smaller APC UPS with computers attached Low cost Voltage Regulators sometimes connected between mains and UPS or device. I know that each of these things needs to be appropriately rated for the equipment to which it is connected (although I am not sure how to calculate the correct rating). The offices will generally have the following equipment (in varying quantities): some sort of internet connection device (VSAT router, ADSL modem, WiMax router) Cisco ASA 5505 firewall a bunch of PCs printers one server I don't seek to replace the advice of an electrician, but in some of these locations they only answer the questions you ask them, so I need to make sure I have enough understanding of the essentials to protect equipment from damage, and possibly get through some power cuts.

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• Hardware for Capturing Packets

  - by Kevin

  One of my clients is a small school district in Texas. Like any school, they often have problems with network'd peripherals such as printers, et al. It would be nice to be able to simply "listen" to what the printer and PC are saying to each other (or not saying more importantly)... The problem is that I can't find old-style "hubs" anymore, and even if I could, it's not a long-term solution. All of the devices that I have found to replicate the purpose of a simple hub are either $100+ or are difficult to throw into a networking tool kit (aka my backpack)... Now that hubs are dead, what's the new low-cost standard for simple packet capture in the networking world?

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• Raid system fails to boot after moving from 2.6 kernel to 3.5

  - by user846226

  I'm running Gentoo Linux with a custom compiled kernel and I've just migrated from a 2.6 kernel to a 3.5. As my HD's are on RAID 0 mode I use a custom initrd file in order to be able to boot. While kernel 2.6 is able to boot without problems the new 3.5 compiled kernel fails to boot complaining about no block devices found. After taking a look at initrd.cpio contained scripts I can see the failure message is given by mdadm tool. Does anyone has a clue about that? Edit: this morning i noticed there was some kind of issue on my old initrd which works fine for 2.6 kernels, so created a new initrd which works fine and let me to boot into GNU/Gentoo Linux with same 3.5 bzImage. It could be an issue of mdadm, gonna check it. https://bugs.gentoo.org/show_bug.cgi?id=416081

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• Can I connect my ipod's earphones to my computer?

  - by user1361315

  My computer (recent model Dell z600) has 2 input devices on the front of the computer, 1 has an icon of headphones and the other is a Mic icon. When I plugin my earphones to the input device that has the headphones, and play some sound I don't hear anything from my earphones (sounds comes from built in speakers). I know when I plugin a USB headphone set, it switches over to those on but for some reason my earphones are not being picked up. Is it not compatible? Note: my earphones look similar to http://www.hdaccessory.com/catalog/reprearphone.jpg

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• Cross-platform automatic adhoc wifi?

  - by marienbad

  I'm not very knowledgeable about wifi, but I understand the notion of Adhoc networks (Wifi without a router), so... Is there a standard (or widely implemented) way of letting a device "momentarily" negotiate a wifi connection (Adhoc network or otherwise) directly to another device, transfer some data, and then quit, all without any user intervention on either device? For example, let's say I have a PC and an ereader in the same room and there's no nearby wifi router for either of these devices to connect to. I want to send a file from PC to ereader but I don't want to do the work of setting up network, selecting an SSID, or entering passwords. Is that possible?

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