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• Running DNS locally for home network

  - by Roy Rico

  I have a small home network that just got larger ( New roommate, My existing roommate got a laptop (on top of her computer)j, my friends coming over with laptop, etc ). I'd like to run a local DNS server for lookups of my local network stuff (fileserver.local, windowsTV.local, machineA.local, machineB.local, appletv.local). I used to have a business line with a static IP, and run bind/named internally. However, now, I have a normal account. My ISP's DNS servers are constantly changing (for whatever reasons my ISP doesn't like to keep the same IP range for long). I need my local DNS to be automatically updated to use my ISP's DNS for external traffic, but be able to maintain an internal DNS server (getting to update the hosts file is being a hassle with every new machine on top of rebuilding existing machines with win7 or Ubuntu 9.04). Additionally, My ISP's DNS servers often crash or become unresponsive. Are there any open DNS servers that are reliable (i don't want to reconfig every day) that I could use as my primary, then if those fail, then use my ISP's? UPDATE: Also looking for each workstation to be able to use dhcp to connect, but instead of getting ISP dns servers, getting my internal one.... Thanks

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• cfengine3 file_copy only on source side change

  - by megamic

  I am using the 'digest' copy method for all file copy promises, because of the way we package and deploy software, I cant rely on mtime for the criteria for updating files. For various reasons, I am not employing the client-server approach with a central configuration server: rather we package and deploy our entire configuration module to each server, so from cf-engine's perspective, the source and target are local on the server it is running. The problem I am having with this approach is that the source will always update the target when they differ - which is what I want most of the time, usually because the source has been updated. However, like many other cfengine users, we are running an operational environment, where occasionally emergency fixes have to be applied immediately - meaning we don't have time to rebuild and redeploy a configuration module, and the fix will often be applied by deploying a tarball with specific changes. Of course this is problematic if cf-engine comes along 5 mintues later and reverts the changes. What we would like is to be able to make small, incremental changes to our servers, without them being reverted, until the next deployment cycle at which time the new source files would be copied. We do not consider random file corruption or mistaken changes to involve enough risk to warrant having cfengine constantly revert deployments to their source copy - the ability to deploy emergency fixes and have them stay that way until the next deployment would be of much greater value and utility. So, after all that, my question is this: is cf-engine capable of detecting whether it was the source or target that changed when the files differ, and if so, is their a way to use the 'digest' copy method but only if the source side changed? I am very open to other ideas and approaches as-well, as I am still quite new to this whole configuration management thing.

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• How to make Exchange 2003 non-authoritive

  - by Romski

  Background We are a small company with an internally hosted Exchange 2003. It receives email for 2 domains (the company was renamed a few years back). For the sake of argument, the domains are: oldname.com newname.com We have moved newname.com to a hosted exchange service, and our DNS record is correctly routing emails. Our internal server still receives email for oldname.com, although we have asked our hosting company to accept emails for that domain. Problem My problem is that emails generated internally from monitoring software, printer, etc. are being caught by our (defunct) internal server and being delivered to the old mailboxes. I believe that what is happening is that our internal exchange server considers itself to be the authoritive server for newname.com. I think it must be looking in active directory for a mailbox and delivering it internally without ever going outside. Attempt to fix I started to follow the article here: http://support.microsoft.com/kb/321721. I removed the SMTP recipient policy for newname.com, and added a dummy address and made it primary. I also answered yes for updating the associated emails. I then restarted the Microsoft Exchange Routing System and SMTP, but emails are still being routed internally. Is there a way to force the exchange server to route all emails for the domain newname.com to the new hosted service?

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• Failing to send email on Ubuntu box (Karmic Koala)

  - by user25312

  I have a home network with an XP and Ubuntu (9.10) box. I have created a small test php script for checking that I can send emails from my machine. I am using the same php.ini file with the same [mail settings], yet the file works on my XP box, and fails on the Ubuntu box. I have included the script here, hopefully, someone can spot whats going wrong: <?php // send e-mail to ... $to="[email protected]"; // Your subject $subject="Test Email"; // From //$header="from: test script"; $header='From: host-email-username@hostdomain_here' . "\r\n" . // Your message $message="Hello \r\n"; $message.="This is test\r\n"; $message.="Test again "; // send email $sentmail = mail($to,$subject,$message,$header); // if your email succesfully sent if($sentmail){ echo "Email Has Been Sent ."; } else { echo "Cannot Send Email "; } ?> The emails have been spoofed for obvious reasons, but otherwise, the script is exactly as the one I tested [Edit] I have since installed mailutils package on my Ubuntu box, now the script runs and returns 'Email has been sent'. However, the mail never arrives in my mail inbox (I've waited 1 day so far). Is there something else I need to be looking at?

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• ASUS M51SE freezes for no apparent reason

  - by Piotr Justyna

  First of all, it's my first question on superuser so please excuse me if it doesn't belong here, a similar one has already been posted here or if I missed some details. My ASUS M51 freezes up. It all started a couple of months ago and I basically forgot about it since I bought a new laptop around that time. This is, however, bugging me since then and I can't explain why it's happening. Let me quickly describe what's wrong. When switched on and running (win 7) it freezes after a couple of minutes of normal usage (or even if I don't actually do anything). By 'freezes', I mean it's like a static image of my desktop was being displayed on the screen. Nothing happens, alt+ctrl+del doesn't help, I basically have to switch it off using a power button. I tried to remove the hard drive and to start the laptop without it. The same here - it freezes on the the initial black loading screen (a couple of minutes after the computer says it can't find the hdd) I tried to remove RAM - the same thing. All fans are spinning as they should. I cleaned the fans using a small paintbrush but it doesn't change anything. The laptop is generally clean and in pretty good physical shape. Well, almost, obviously :). One possible clue I can think of is that the laptop is heating excessively even when it doesn't actually do anything (hdd removed). Do you have any ideas what is the cause of this or what else can I try? Thanks, Piotr

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• EEE PC dropbox server running 24/7

  - by microspino

  I'd like to create a mini dropbox and print server on a small soho network of 5 users (all of them use windows XP desktops). The device need to run 24/7 or at least 12/7 (I can accept just workday hours too but the other two options would be better). Dropbox mini server: I mean I will have a 90gb dropbox on every computer on my network LAN syncing with It and the one onto It syncing to the web. Print Server: I have Samsung SCX 4521F (fax/print/scan/copy), Samsung ML2010, HP Laser jet P1006, HP Color Laserjet CP1215, HP Office jet pro K8600, HP Design jet 500. All of them now are connected using little print servers and I want to get rid of them hooking everything to this mini server. The fax/print/scan/copy machine need to stay connected to a PC to make me able to use the software that comes with It. The mini server would save me on this too. Fax/Scan server: since I have the above mentioned fax/print/scan/copy machine I would like to make people use It from/to their computers through the mini server. I thought to a recent EEEBOX machine because I heard good things about ATOM cpus and because It seems that a recent BIOS version could switch It off and on autonomously. I'd like to listen some advice from You. Best of all would be: If You have something similar running for a long time If You disagree with this hardware choice and If You would suggest some other device. If You see any issues with my printing setup Anything else ;) My budget is from Zero (using right sw to build something on top on a old PC) to 500€ max.

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• Defeating the RAID5 write hole with ZFS (but not RAID-Z) [closed]

  - by Michael Shick

  I'm setting up a long-term storage system for keeping personal backups and archives. I plan to have RAID5 starting with a relatively small array and adding devices over time to expand storage. I may also want to convert to RAID6 down the road when the array gets large. Linux md is a perfect fit for this use case since it allows both of the changes I want on a live array and performance isn't at all important. Low cost is also great. Now, I also want to defend against file corruption, so it looked like a RAID-Z1 would be a good fit, but evidently I would only be able to add additional RAID5 (RAID-Z1) sets at a time rather than individual drives. I want to be able to add drives one at a time, and I don't want to have to give up another device for parity with every expansion. So at this point, it looks like I'll be using a plain ZFS filesystem on top of an md RAID5 array. That brings me to my primary question: Will ZFS be able to correct or at least detect corruption resulting from the RAID5 write hole? Additionally, any other caveats or advice for such a set up is welcome. I'll probably be using Debian, but I'll definitely be using Linux since I'm familiar with it, so that means only as new a version of ZFS as is available for Linux (via ZFS-FUSE or so).

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• java max heap size, how much is too much

  - by brad

  I'm having issues with a JRuby (rails) app running in tomcat. Occasionally page requests can take up to a minute to return (even though the rails logs processed the request in seconds so it's obviously a tomcat issue). I'm wondering what settings are optimal for the java heap size. I know there's no definitive answer, but I thought maybe someone could comment on my setup. I'm on a small EC2 instance which has 1.7g ram. I have the following JAVA_OPTS: -Xmx1536m -Xms256m -XX:MaxPermSize=256m -XX:+CMSClassUnloadingEnabled My first thought is that Xmx is too high. If I only have 1.7gb and I allocated 1.5gb to java, i feel like I'll get a lot of paging. Typically my java process shows (in top) 1.1g res memory and 2g virtual. I also read somewhere that setting the Xms and Xmx to the same size will help as it eliminates time spend on memory allocation. I'm not a java person but I've been tasked with figuring out this problem and I'm trying to find out where to start. Any tips are greatly appreciated!! update I've started analyzing the garbage collection dumps using -XX:+PrintGCDetails When i notice these occasional long load times, the gc logs go nuts. the last one I did (which took 25s to complete) I had gc log lines such as: 1720.267: [GC 1720.267: [DefNew: 27712K->16K(31104K), 0.0068020 secs] 281792K->254096K(444112K), 0.0069440 secs] 1720.294: [GC 1720.294: [DefNew: 27728K->0K(31104K), 0.0343340 secs] 281808K->254080K(444112K), 0.0344910 secs] about 300 of them on a single request!!! Now, I don't totally understand why it's always GC'ng from ~28m down to 0 over and over.

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• Dell fumbles OpenManage installation process, forgets to write documentation?

  - by bwerks

  Hi all, I'm setting up a Dell PowerEdge 2950 for a small business, and I've just spent a while with Dell OpenManage Server Administrator 6.2, trying to clear the installation process of errors before I execute it. Right now I'm getting the following warning from the installer. The installer has detected that the HTTPS listener is not configured for Windows Remote Management. You can either configure the HTTPS listener before installing Remote Enablement, or install Remote Enablement now by selecting the "Custom" installation screen and configure the HTTPS listener later. See the "Remote Enablement Requirements" section in the "Dell OpenManage Installation and Security User's Guide" for information on configuring the HTTPS listener. Note: Remote Enablement is required to manage this system from a remote Server Administrator Web Server and is applicable only for those systems that support Server Instrumentation. Click here to configure HTTPs Listener for Windows Remote Management. The italicized line is a link, which executes...something...via cmd, and doesn't seem to help the problem. Not knowing exactly what to do here, I consulted the documentation. I read through the Setup and Administration section of the User's Guide, but all that it contained was a weird primer on role-based security and some SNMP stuff. The next section skips installation entirely and moved on to features of the suite. Thinking myself crazy, I consulted the readme, which told me that for installation I should consult the "Dell OpenManage Installation and Security Version 6.2 User's Guide" which not only doesn't exist in the documentation, but also not in all of google? Soo yeah, if anyone is familiar with this problem, drop me some knowledge!

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• Accidentally mounted a ReiserFS drive as MBR on my windows box - how do I recover?

  - by Ryan

  I had a WD Netcenter with a 160GB drive that kept dropping off the network. I opened up the enclosure and removed the hard drive, connected to a Windows box without knowing the drive used ReiserFS.... When mounting on the Windows box, I chose "MBR" as filesystem. 70GB of data corrupted: 90% of data is word documents, excel spreadsheets, and jpg's - all mission critical. Attempted recovery on Linux box (ubuntu) using TestDisk: I could see the container, but couldn't get anything out – according to TestDisk this was because I chose "none" as filesystem. Attempted recovery using Nucleus Kernel Recovery for windows: 98% of what was recovered is incomplete and/or unusable. I need to know if a way exists to recover or rebuild original ReiserFS MBR, or what tools/techniques might give me the best results in recovering the data. Found a Windows version of TestDisk and I ran it yesterday - here are the results: TestDisk 6.14-WIP, Data Recovery Utility, May 2012 Christophe GRENIER <[email protected]> http://www.cgsecurity.org Disk /dev/sda - 160 GB / 149 GiB - CHS 19457 255 63 The harddisk (160 GB / 149 GiB) seems too small! (< 519 GB / 483 GiB) Check the harddisk size: HD jumpers settings, BIOS detection... The following partitions can't be recovered: Partition Start End Size in sectors > ReiserFS 3.6 62 241 8 19458 0 18 311581568 ReiserFS 3.6 62 248 55 19458 8 2 311581568 ReiserFS 3.6 62 254 37 19458 13 47 311581568 ReiserFS 3.6 63 6 28 19458 20 38 311581568 ReiserFS 3.6 63 13 11 19458 27 21 311581568 ReiserFS 3.6 63 21 43 19458 35 53 311581568 ReiserFS 3.6 63 27 41 19458 41 51 311581568 ReiserFS 3.6 63 37 35 19458 51 45 311581568 ReiserFS 3.6 63 54 20 19458 68 30 311581568 ReiserFS 3.6 63 76 26 19458 90 36 311581568

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• Font for Wine that supports the entire character set of the Win32 Console?

  - by Brian Campbell

  I would like to be able to display in the Wine console all characters that the Win32 console can display. I've written a small test program to print out all 8-bit characters: #include <stdio.h> int main(int argc, char *argv[]) { int i, j; for (i = 0; i <= 0xF0; i+=0x10) { for (j = i; j <= i + 0x0F; ++j) printf("%2x:%c", j, (char)j); printf("\n"); } getchar(); return 0; } Under Wine, the best I can do so far is using Andale Mono: While this is what I see on Windows Server 2008: Is there anywhere I can legally download a font that will allow me to view all of those characters under Wine? edit I've found a set of DOS fonts that includes a CP437 font, which should cover the character set I'm interested in. However, even if I install this font, wineconsole doesn't seem to recognize it. Is there any way I can get wineconsole to use this font, or convert this font to a format that wineconsole can use? Or is there any way I can extract fonts from DOSEMU for use in Wine? Oh, and I should probably mention that I'm on Mac OS X 10.6.2, installing Wine via MacPorts, using the wine-devel package. more information I have tried installing some console fonts that should cover the full character set as Mac OS X fonts (such as the NewDOS font listed above, and a font I tried converting from the fonts supplied by DOSEMU). Wine does not seem to pick up on new fonts installed in Mac OS X. Is there a way to register new fonts I've installed with Wine? Would manually editing the system.reg file that seems to contain font mappings work, or is there something else I'd need to do? bump Bounty ends soon, I'm still looking for an answer for this. Does anyone use the Wine console for complex text user interfaces?

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• Getting started with webserver clustering.

  - by Ernie

  I work for a small ISP, and we host about 250 domains and all the stuff that goes along with that: DNS, mail, spam filtering, and backups. Currently, we have separate DNS servers (two of them) and mail servers (outgoing mail is actually on the secondary DNS server, but was previously on its own server). In the past, this was done as an insurance measure. The last thing we need is for some doofus (usually yours truly) to hose a server, taking out DNS and mail right along with it, or for spammers to jam our incoming SMTP server, preventing outgoing mail from being sent too. In the past, this was a problem, and our servers were set up the way they are now to combat it. However, clustering solutions like Sun's Cobalt RAQ (in days of olde) and Virtualmin appear to cater to an all-in-one approach, then deal with failures through redundant servers. I have avoided this thus far, but we've been using Virtualmin on our web server for a while now, and I'd like to expand into using it for a high availability cluster. Our networking partner has recently built a datacenter that has eliminated all of our other bugaboos like network, cooling, and power issues, so now the only thing left to go wrong is me hosing a server, which happened earlier this month. One of the bigger reasons we've avoided going this route is because our hardware requirements aren't particularly high. One server easily handles all the sites we host (most of them are flat sites). Also, load-balancing routers tend to be expensive and complicated. All that I'm really expecting to do is building a two-node cluster for redundancy so that when I hose a server (however rare that might be), we're not out for 8-12 hours while I rebuild it. What I need to know is how to get started, and if I'm really in a position to bother with this kind of thing at all.

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• Huge host CPU usage in idle vmware guest. Ubuntu 10.04 host, Vista SP2 guest

  - by themesandmodules

  I'm experiencing huge host CPU usage with an idle vmware guest. Host: Ubuntu 10.04 32-bit 2.6.32-24-generic-pae. (Very new install, i.e 24 hours ago) Hardware is Dell XPS M1530 laptop, 4GB ram. Intel Core II Duo T9300 2.50Ghz The virtualization setting "VT" or something is enabled in my bios. Guest: Completely fresh install of Windows Vista, upgraded to latest SP2 and all windows updates installed. 1024 - 1512MB ram allocated. Absolutely no other software installed on it, apart from VMWare tools. Situation When the guest is doing absolutely nothing, I watch with sysinternals process watch on the guest. This shows that system idle process is between 70 and 99%, usually around 95%. No actual process doing anything. On the host, I watch with top, I get cpu usage of 20% - 80%, usually around 30%. What I have tried Single and Dual processor available to guest - no change. Turn off all peripherals to guest - no network, drives, usb etc - no change. Turn off 3d acceleration for guest - perhaps a small improvement, or no change. Upping allocated ram to guest from 1024MB to 1512MB - no change. Yelling at vmware - no change. I have experienced a similar issue in the past, which was solved by setting the guest to have 1 CPU. This time that hasn't worked.

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• Please advise on VPS config choice (with SQL Server Express)

  - by tjeuten

  Hi all, I might be interested in getting a VPS hosting plan for some small personal sites and .NET projects. Was thinking of Softsys Bronze Plan, as my current shared host plan is with them too. The stuff I want to host has grown beyond the capabilities of a Shared hosting plan, and I also want more control over the IIS/ASP.NET configuration, that's why I'm considering VPS. The main config details would be: Hyper-V 30 GB of diskspace 1 GB of RAM More info here: http://www.softsyshosting.com/Windows-VPS-HyperV.aspx Does anyone have experience with this plan (or something similar from another host), and maybe could answer these couple of questions: Bronze has a total diskspace of 30GB. Is the OS part of this quota or not ? If so, how much does a base configuration with Windows 2008 take up in diskspace ? Would you advise Windows 2008 R2 or Normal. Or would you advise to use Windows 2003 with this config. I'm planning on running a SQL Server Express install too. Would 1 GB of RAM be enough for both the Windows 2008 (R2) and SQL Express. The database load will not be that very high (a couple of 1000 records returned each day). The DB will most likely be far away from the 4GB limit, that's why I'd go for a SQL Express instead of paying extra licensing costs for a SQL Web install. But I'm more concerned about performance. Would you recommend Softsys as a VPS host ? I've been with them for one year for my Shared hosting plan, and have no complaints so far. Also, as I have no VPS experience, what are the pitfalls I need to be aware of, in terms of performance mainly, but maybe in other areas too ? Mathieu

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• Batch deletion of smaller files from group of files via unix command line

  - by artlung

  I have a large number (more than 400) of directories full of photos. What I want to do is to keep the larger sizes of these photos. Each directory has 31 to 66 files in it. Each directory has thumbnails, and larger versions, plus a file called example.jpg I dispatched the example.jpg file easily with: rm */example.jpg I initially thought that it would be easy to delete the thumbnails, but the problem is they are not consistently named. The typical pattern was photo1.jpg and photo1s.jpg. I did rm */photo*s.jpg but it ended up some of the files named photoXs.jpg were actually larger and not smaller. Argh. So what I want to do is scan each directory for filesize and delete (or move) the thumbnails. I initially thought I'd just ls -R every file and extract the size of each file and save those under a threshold. The problem? In one directory the large will be 1.1 MB and the thumb is 200k. In another the large is 200k and the small 30k. Even worse, the files really are mostly named photo1.jpg - so simply putting them all in the same folder, sorting by size, and deleting in groups would not work without renaming already, and if it's possible I'd prefer to keep them in their folders. I was almost resolved to just doing this all manually, but then thought I'd ask here. How would you do this task?

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• PostgreSQL failover cluster on Windows Server

  - by user36997

  We are looking for advice on how to setup a basic failover cluster for our application: We will be using 4 machines running Microsoft Windows Server (most probably 2003). All four will always run our application, which is essentially a web service. Load balancing is "outsourced" - somebody else handles the distribution of the web requests among the servers. Only one of the servers will be running the PostgreSQL server actively at any given time. Another server (of the four) also has the DB installed, but is on standby/passive. The DB data is stored on shared storage. No copying data between servers. Reads are done very frequently by many end-users, and in rather small chunks of data. Writes are done much less frequently, by less users, and in very large bulks of data. Now, how can one configure Microsoft Cluster Service to keep only one instance of the DB server and 4 instances (1 per server) of our application at all times? And does PostgreSQL integrate neatly with MSCS at all? Update: Instead of keeping the data on shared storage, I also consider using log shipping to replicate data on a couple of DB servers. There are two issues with this option: Log shipping only makes sure that I have a second server that gets all of the data and is ready to take over. How do I implement the actual failure detection and failover switch? Switching back: Suppose the master fails and the system automatically fails over to the slave, and later the master comes back online. I understand that with WAL shipping this will require to reconfigure the log shipping once again, and that switching back is far from seamless. Is that so?

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• Datacenter IP Addressing and DNS Management

  - by user65248

  Hello everyone Basically we are setting up a small Datacenter, about 300 amps power and max 50 racks, Im saying these coz I wanna u imagine the size and requirements, I have studied networking mostly Microsoft and Windows based systems , but I cant get how the IP addressing and DNS management and configuration works in a Datacenter , and unfortunately I have to setup everything by myself but defe we will have some staff to do some job. Now my questions Datacenter IP Addressing Suppose we have got a block of 200 IP addresses from our ISP, How can I manage these block of IP addresses, is there any software out there to simplify this I heard that using DHCP server in a datacenter is not recommended, otherwise what would u say about MS DHCL server ofc considering we need to have backup serversin case of failur How can I assign a block of IPs to a specific rack, I know with different software and management its different but Im asking how it is done normally IP addresses are exposed to the whole network, what if a customer try to use an IP address and is not assigned to their server or rack , how can I prevent this or how can I track the IP usage DNS Management Im goin to setup at least two servers for our DNS servers, I know nothing about Datacenter DNS system, but I have configured DNS server in normal networks and also for webservers, Now I wanna know What exactly needs to be done for a DNS in a datacenter that is not done for normal networks. How can I configure PTR records why cant I configure PTR records on my webserver side DNS server and it should be done on datacenter DNS server , I mean what is the difference in DC DNS servers that allow us to to so , I know the question is very silly and simple but Im confused Is there any software outthere to allow doing the whole thing, I mean automatically add records to the DNS and also managin IP addresses !? Thanks in advance

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• Robocopy launches and then hangs/just sits there

  - by NateO

  I'm setting up an archive process to store old files on an external hard drive. The computer in question is running Windows 7 Pro 32bit. We have a server folder with 150,000+ files in it, most of which are pretty small (below 200k). I'm trying to use robocopy in a batch file to do this. It was working fine the other day, now all it does upon launch is sit there. It shows me all the options and whatnot, and also lists the number of files in the directory and the directory itself, but it never gets past that line. If I switch the destination to the local C drive, it eventually starts copying files. Is there something in my batch file that needs to change? Or could there be a problem with the external Western Digital drive that I'm using? The WD drive currently is holding about 175,000 files. Here is the one line batch file I have: robocopy "\\cgifp01\Prepress\Public\ImportedPDF" "E:\OldFiles" *.* /R:2 /W:10 /MINAGE:15 /MOV /B /XJ /XF "blank_test.pdf" Thanks for any tips or ideas. Nate

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• Moving Farm to co-location hosting - network settings requirements

  - by Saariko

  I am moving my farm (2 Dell's R620) to a co-location hosting service. I am trying to figure out the secure way to have my network settings The requirements are: VM1 is the working HOST, includes: esxi 5.1, vSphere, 4 clients (w2008r2 all) VM2 has esxi 5.1 installed, and a single machine with Veeam Backup and copy 6.5 - keeping a copy of VM1 clients on the VM2 internal storage (this solution is due to a very small budget - in case of failure on Host 1 - can redirect IP's) Only 2 VM clients require network address and access from the WWAN - ISP provides IP's range for them (with Gateway and DNS) I need connection to the iDrac's from my office (option to create a VPN-SSL tunnel) Connection to the vSphere appliances I want to be able to RDP to the VM clients The current configuration is that each host has the iDrac dedicated nic connected , and another (NIC #1) connected - with a static IP on 192.168.3.x The iDrac's have a static IP from the same network range (19.168.3.x) It will look something like this: My thoughts: On NIC#2 of both hosts I will connected a crossed cable I will give each VM clients that needs internet access a 2ndry VM network with the assigned IP from the ISP open only to web - can not access from the My Question: Should I give IP's (external) to the machines who DO NOT require WWAN Access? - I can't see a way to RDP to them directly if not. Should I use the crossed cable? or just plug NIC #2 to the switch? Will this setup even work? What do I need to verify? What Virtual nic's and/or switches should I create on the Hosts?

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• Network Explorer Intermittently Fails to Display all Computers in Work Group

  - by graf_ignotiev

  I run a small computer lab of 10 computers and occasionally, when using the network explorer (a.k.a Network Browser) some or all of the remote computers will fail to appear. If I try to access a remote computer by its name I get an unspecified error (code 0x80004005), but I am still able to access it with the computer's IP address. The strangest part is that the problem will inexplicably go away after waiting awhile. Each computer is running Windows 7 x64 Enterprise and has identical hardware, software and configuration. They are all on the same subnet and in the same workgroup. I've spent days researching the problem and have tried the following solutions: Updated the BIOS, chipset and network adapter drivers Changed Power Settings in Network Adapter Properties so that the computer will not turn it off Disabled the Computer Browser service Changed the DHCP node type to broadcast Reviewed the Event Viewer logs Steps 3 and 4 have seemed to help the problem a little bit, but not completely. I'm beginning to suspect that the problem might lie with our router which is a ZyXEL ZyWALL 2WG, as the packets sent by Network Discovery may not be returning in time, but I wanted to get some perspective in the issue before I went any further.

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• Formatting a a memory stick with two partitions?

  - by Marius

  I have a 16GB memorystick which used to have a Linux partition. It therefore has two partitions; 2GB FAT32 and 14GB linux boot drive. The linux part stopped working, so I decided to reinstall it. But windows can't see that partition. I tried formatting the whole disk, but I can only format one partition (the FAT32). There seems to be no way to combine the two partitions into one big one, and there seems to be no way for windows to partition the large part of the memorystick to but Linux on it. In the windows partition manager, windows sees the large unused partition, and it let me delete it. But once I have deleted it, I'm not allowed to format it. Also I cannot delete or resize the small partition. So, to summarize: I have a memorystick with two partitons. Windows only sees one of them, and won't let me use the other one. I would like to combine the two partitions so I can install Linux on the memory stick again.

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• Name resolution not working with ipv6 on centos

  - by jolivier

  I just installed CentOs 6.3 on a server to be installed in a data center, but cannot get name resolution / curl to work. I know this is because of it trying to use ipv6, since ping google.com works, curl -4 google.com works, but not curl google.com. I removed the ipv6 adress from the interface and it does not change anything. This is very problematic since most system tools like yum fail at name resolution currently. Browsers like Firefox work because they might be using another tool for name resolution than the one use by curl. I managed to fix this on workstations by completely disabling ipv6 following tutorials like this one / hardcoding name resolution in /etc/hosts. But since I am here configuring a server which will be later installed in a remote data center, I would like not to mess up, understand what is going on and fix it properly. Besides, I will face the same issue with more servers to come so I would really appreciate your help in understanding this problem and how to solve it. I would be happy to provide more information if needed to help understand what is going on. The current network configuration is a small enterprise network, with a DNS server (let's call it A) configured once a long time ago. dig google.com and dig -4 google.com are both refused by the A DNS. But this is also true for my workstation on which curl is working (and yes they both use the same A DNS server). Indeed this faulty server and my workstation have multiple nameservers in /etc/resolv.conf, and the second one is working fine for both of them, so if I remove A from my resolv.conf everything works fine! Regards, Olivier

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• Join mp4 files in linux

  - by Jose Armando

  I want to join two mp4 files to create a single one. The video streams are encoded in h264 and the audio in aac. I can not re-encode the videos to another format due to computational reasons. Also, I cannot use any gui programs, all processing must be performed with linux command line utilities. FFmpeg cannot do this for mpeg4 files so instead I used MP4Box e.g. MP4Box -add video1.mp4 -cat video2.mp4 newvideo.mp4 unfortunately the audio gets all mixed up. I thought that the problem was that the audio was in aac so I transcoded it in mp3 and used again MP4Box. In this case the audio is fine for the first half of newvideo.mp4 (corresponding to video1.mp4) but then their is no audio and I cannot navigate in the video also. My next thought was that the audio and video streams had some small discrepancies in their lengths that I should fix. So for each input video I splitted the video and audio streams and then joined them with the -shortest option in ffmpeg. thus for the first video I ran avconv -y -i video1.mp4 -c copy -map 0:0 videostream1.mp4 avconv -y -i video1.mp4 -c copy -map 0:1 audiostream1.m4a avconv -y -i videostream1.mp4 -i audiostream1.m4a -c copy -shortest video1_aligned.mp4 similarly for the second video and then used MP4Box as previously. Unfortunately this didn't work either. The only success I had was when I joined the video streams separetely (i.e. videostream1.mp4 and videostream2.mp4) and the audio streams (i.e. audiostream1.m4a and audiostream2.m4a) and then joined the video and audio in a final file. However, the synchronization is lost for the second half of the video. Concretelly, there is a 1 sec delay of audio and video. Any suggestions are really welcome.

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• Default Gateway solution on NAT'd network (best options)

  - by kwiksand

  I've recently changed a network from a bunch of machines exposed to the net on a network to a more security conscious Firewall-fronted network with a DMZ for public services. Everything's mostly working perfectly now, but I've got the old problem of NAT Loopback where a machine within the LAN wants to access a public service via the public/external IP. I've solved this problem previously in a small/SOHO environment simply using NAT loopback features of the router in use or a simple iptables rule to do the same, but I want to make sure I make the most resilient choice with the least concern. It seems I can: Use iptables as I've said to DNAT and MASQUERADE the change source/destination so the connection works correctly i.e iptables -A PREROUTING -t nat -d ip.of.eth0.here -p tcp --dport 8080 -j DNAT --to 192.168.0.201:8080 iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -p tcp --dport 8080 -d 192.168.0.201 -j MASQUERADE Use split DNS, with internal mappings for public IP's Potentially do some route nastyness by setting the Default Gateway to use a different externally exposed IP to then come back in the public route (messy) Someone mentioned putting the Default Gateway within the DMZ as well (on serverfault), but I can't find the post again. I'm sure this is a common issue for many with NAT'd networks, but I've not really seen the perfect solve all when it comes to fixing this problem. What is your opinion?

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• copying an lvm partition to a smaller disk, and renaming volume groups.

  - by dlamblin

  I was trying to shrink a vmdk (VMWare disk image) file to be as small as possible, and found two recommendations. The first is to cat /dev/zero into the fs then delete it, and run VMWare tools' shrink. This works okay. The second is to copy everything into a new vmdk. I went the second route. I did not use dd because I actaully want to use as few blocks as possible, instead of having a block-by-clok copy. Any unlinked files will still have blocks that aren't zeroed out. Secondly the centos image was mostly lvm, except for the boot partition, and my target was going to be 4gb instead of 8gb. I did use dd for the first 40mb to get the boot blocks and partition copied. I then used parted to create an identical primary boot, and smaller primary lvm. Then I used pvcreate on that device sdb2, vgcreate, and lvcreate to create a root and swap. I used mkfs.ext3fs on the root partition and then rsync -av / /2root excluding /proc /sys /2root /dev. So far everything went fine. My problem is that: The result is 2.7 GB while the source was 2.1 GB. This is weird to me. The second vgroup is called VolGroup01, while the original was called VolGroup00. How can I rename the VolGroup01 to VolGroup00 and swap it out after all this?

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