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• cant access site intermittent as i get site not available

  - by user61438

  i have a news site i check stuff for regularly.. once in a while i cant access it completely from my 5 different browsers and even from the command line, nslookup cant resolve, ping and tracert fails.. all not being able to resolve site name..the problem is specific to this.. i am told by the site support person that problem is that its cache on my machine or on ISP and I say thats not true because this site I access it 1-2-3 times a week from one browser only.. i only fire up the other ones in times of trouble..and when i have the problem even if i try on my secondary machines i still get the same problems.. when problem goes away all works well.... question is whats causing the intermittent dns/http problems... i don't believe this is something to do with my machine because probe disappears without me having done anything at all.

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• Home Media Streaming Server

  - by sharjeel

  I'm looking for a Home Media Server which can stream videos to various devices including iPhone, iPad, Windows Machines, Android etc. I wouldn't want to install any client on any device; a web interface will be preferred. Also, it should be able to read videos of as many formats as possible and should stream by transcoding the resolution and format according to device's specifications. I have a fairly powerful machine on which I'm free to install Windows 7 or Linux. The streaming will be done over a g/n WiFi router or Ethernet locally. What is the suggested solution in my case?

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• How do I set zone priority in Microsoft DNS?

  - by Justin

  I have a standard small network setup (20 users) on Active Directory. All Windows machines have a primary DNS server as the AD and a secondary DNS server as Google PDNS. I want to setup a DNS entry that exists in real DNS but set it up on our DC so that local requests would route this public domain to a local development machine on the network. I setup the zone in DNS which results in the clients resolving the public FQDN to our internal IP. However, sometimes it still resolves to the "real" value (I check by pinging it). Is there some way to give the zone definition in my DC DNS higher priority? Or will the client that has secondary public DNS always at sometimes have a competing entry for this zone?

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• How to set up a staging apt repository to securely manage upgrades

  - by andreash

  Hello, I would like to be able to run automatic apt-get upgrade (once per hour) on our servers (Ubuntu 10.04), so that I don't have to do it manually on all of them (about 15). However, for production machines, that's not a good idea ... So here's my idea: Set up a local repository for all 'approved' updates for critical packages. I would then push updated packages from upstream to our local repo after I tested them, and all servers could automatically (apt-cron?) upgrade from this repository. So my question is this: How do I configure apt on the clients so that they use the local repository only for all packages which exist on the local repository, and the upstream one for all other packages? Does this actually make sense? Or am I missing something? Anyways, thanks for your insight! Andreas.

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• FTP Sites vs Sites in IIS 7.0

  - by NealWalters

  We have one FTP site set up (and working) basically like the instructions here: http://www.iis.net/learn/publish/using-the-ftp-service/creating-a-new-ftp-site-in-iis-7 It shows up under "Sites" and then the name of our FTP Site. However, above "Sites" (in the left navigation tree view), we see a node called "FTP Sites". When we click on it, it says "FTP Management is provided by IIS 6.0". Can someone give me the big picture of why this node appears, and why IIS 6 is involved? Is is some backward compatible feature? I didn't build these machines, so don't know the reasoning of what was done before I arrived on the scene. Also, is the tree view icon for websites and FTP sites the same?

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• DNS problems on CentOS fresh install

  - by Rick Koshi

  I'm having some DNS issues on a new box I'm installing with CentOS 6.2. I am able to look up names using nslookup, dig, or host. I am able to ping machines by name or by IP address. However, when I try other tools, such as ssh, wget, or yum, they are unable to resolve names. For example: # wget http://www.google.com --2012-03-08 14:48:06-- http://www.google.com/ Resolving www.google.com... failed: Name or service not known. wget: unable to resolve host address `www.google.com' # ssh www.google.com ssh: Could not resolve hostname www.google.com: Name or service not known # ping -c 1 www.google.com PING www.l.google.com (74.125.113.106) 56(84) bytes of data. 64 bytes from vw-in-f106.1e100.net (74.125.113.106): icmp_seq=1 ttl=46 time=43.6 ms --- www.l.google.com ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 59ms rtt min/avg/max/mdev = 43.665/43.665/43.665/0.000 ms # host www.google.com www.google.com is an alias for www.l.google.com. www.l.google.com has address 74.125.113.99 www.l.google.com has address 74.125.113.103 www.l.google.com has address 74.125.113.104 www.l.google.com has address 74.125.113.105 www.l.google.com has address 74.125.113.106 www.l.google.com has address 74.125.113.147 My /etc/nsswitch.conf file is the default, including this (standard) line: hosts: files dns /etc/resolv.conf is as set up by DHCP: ; generated by /sbin/dhclient-script nameserver 192.168.1.254 192.168.1.254 is a working DNS server (my DSL modem, working for years with other machines) Anyone know why ping would work, but ssh/wget would fail? Per NcA's suggestion, I tried changing /etc/resolv.conf to point to 8.8.8.8. Oddly enough, this does make it work. Obviously, my DSL modem is responding to DNS requests in some way that some parts of Linux's resolution system don't like. Looking at the tcpdump, I am unable to see what the difference is. Certainly, both servers are sending the same addresses. Here's the output from tcpdump -nn -X with the server set to the DNS server on the DSL modem. It's clearly replying with the correct addresses, but ssh/wget don't seem happy with it for some reason: 15:53:52.133580 IP 192.168.1.254.53 > 192.168.1.2.54836: 33157 7/0/0 CNAME www.l.google.com., A 74.125.115.105, A 74.125.115.106, A 74.125.115.147, A 74.125.115.99, A 74.125.115.103, A 74.125.115.104 (148) 0x0000: 4500 00b0 e33a 0000 ff11 53b1 c0a8 01fe E....:....S..... 0x0010: c0a8 0102 0035 d634 009c 7528 8185 8180 .....5.4..u(.... 0x0020: 0001 0007 0000 0000 0377 7777 0667 6f6f .........www.goo 0x0030: 676c 6503 636f 6d00 0001 0001 c00c 0005 gle.com......... 0x0040: 0001 0007 acd0 0008 0377 7777 016c c010 .........www.l.. 0x0050: c02c 0001 0001 0000 0001 0004 4a7d 7369 .,..........J}si 0x0060: c02c 0001 0001 0000 0001 0004 4a7d 736a .,..........J}sj 0x0070: c02c 0001 0001 0000 0001 0004 4a7d 7393 .,..........J}s. 0x0080: c02c 0001 0001 0000 0001 0004 4a7d 7363 .,..........J}sc 0x0090: c02c 0001 0001 0000 0001 0004 4a7d 7367 .,..........J}sg 0x00a0: c02c 0001 0001 0000 0001 0004 4a7d 7368 .,..........J}sh 15:53:52.135669 IP 192.168.1.254.53 > 192.168.1.2.54836: 65062- 0/0/0 (32) 0x0000: 4500 003c e33b 0000 ff11 5424 c0a8 01fe E..<.;....T$.... 0x0010: c0a8 0102 0035 d634 0028 98f9 fe26 8000 .....5.4.(...&.. 0x0020: 0001 0000 0000 0000 0377 7777 0667 6f6f .........www.goo 0x0030: 676c 6503 636f 6d00 001c 0001 gle.com..... I'm not enough of an expert to know if this is malformed in some way, but ping seems to do the right thing with it. For comparison, here's the same thing when querying 8.8.8.8: 15:57:27.990270 IP 8.8.8.8.53 > 192.168.1.2.49028: 59114 7/0/0 CNAME www.l.google.com., A 74.125.113.105, A 74.125.113.103, A 74.125.113.106, A 74.125.113.147, A 74.125.113.104, A 74.125.113.99 (148) 0x0000: 4500 00b0 5530 0000 2f11 6453 0808 0808 E...U0../.dS.... 0x0010: c0a8 0102 0035 bf84 009c 39f8 e6ea 8180 .....5....9..... 0x0020: 0001 0007 0000 0000 0377 7777 0667 6f6f .........www.goo 0x0030: 676c 6503 636f 6d00 0001 0001 c00c 0005 gle.com......... 0x0040: 0001 0001 516a 0008 0377 7777 016c c010 ....Qj...www.l.. 0x0050: c02c 0001 0001 0000 0116 0004 4a7d 7169 .,..........J}qi 0x0060: c02c 0001 0001 0000 0116 0004 4a7d 7167 .,..........J}qg 0x0070: c02c 0001 0001 0000 0116 0004 4a7d 716a .,..........J}qj 0x0080: c02c 0001 0001 0000 0116 0004 4a7d 7193 .,..........J}q. 0x0090: c02c 0001 0001 0000 0116 0004 4a7d 7168 .,..........J}qh 0x00a0: c02c 0001 0001 0000 0116 0004 4a7d 7163 .,..........J}qc 15:57:28.018909 IP 8.8.8.8.53 > 192.168.1.2.49028: 31984 1/1/0 CNAME www.l.google.com. (102) 0x0000: 4500 0082 7b1b 0000 2f11 3e96 0808 0808 E...{.../.>..... 0x0010: c0a8 0102 0035 bf84 006e c67e 7cf0 8180 .....5...n.~|... 0x0020: 0001 0001 0001 0000 0377 7777 0667 6f6f .........www.goo 0x0030: 676c 6503 636f 6d00 001c 0001 c00c 0005 gle.com......... 0x0040: 0001 0001 517f 0008 0377 7777 016c c010 ....Q....www.l.. 0x0050: c030 0006 0001 0000 0258 0026 036e 7334 .0.......X.&.ns4 0x0060: c010 0964 6e73 2d61 646d 696e c010 0016 ...dns-admin.... 0x0070: 91f3 0000 0384 0000 0384 0000 0708 0000 ................ 0x0080: 003c .< I still don't know why the server's reply is adequate for ping but not for ssh/wget. If anyone has ideas, I'd be happy to hear them. For now, though, I can either refer to an outside DNS server or set up my own server on the new box. It's a workaround that seems like it should be unnecessary, but will allow me to proceed.

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• Encryption of external HDD -- accessible from windows without installation

  - by Rainer

  I would like to use encryption on my external HDD but I would like to be able to access the encrypted data from Windows as well. As suggested in other questions, TrueCrypt is one option here, or I am using momentarily encfs, which is not available for Windows. But my question goes further: I would like to be able to access the encrypted partition from Windows without installation as I will be using it from different Windows machines for which I have no administrator access. My main OS is Linux and I have full root access to that computer. Is there a full disk or file based encryption which I can use cross platform and which does not require installation under Windows? ADDITION: It seems that TrueCrypt provides a portable mode which fulfills my requirements partly: http://www.truecrypt.org/docs/?s=truecrypt-portable, but still the TrueCrypt driver needs to be installed by an administrator... pitty Thanks

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• How to Confirm working of Nginx Caching Proxy

  - by Mark

  I am having nginx on port 80 and apache on port 8080 on same server. I have configured nginx such that it act as reverse proxy(i am not sure whether its working or not) using this tutorial http://tumblr.intranation.com/post/766288369/using-nginx-reverse-proxy. steps i followed to verify proxy. opened same page on two different machines within an interval of 5 seconds. but in the apache access.log every request is showing 200 response code.Does that indicate that caching is not working? and nginx access.log is showing nothing.

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• Link bonding across multiple switches?

  - by Bryan Agee

  I've read up a little bit on bonding nics with ifenslave; what I'm having trouble understanding is whether there is special configuration needed in order to split the bonds across two switches. For example, if I have several servers that all have two nics each, and two separate switches, do I just configure the bonds and plug 1 nic from each into switch #1 and the other from each into switch #2? or is there more to it than that? If the bonds are active-backup, will a nic failure on single machine mean that server may become disconnected since the rest of the machines are using the primary nic and it's using the secondary? Or do you link the switches with one cable as well?

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• How do I make a USB stick from which to install different OS's?

  - by Hanno Fietz

  Recently, I have made a number of USB sticks to install OS's (several Linux flavors, BSD, Windows) from, on machines that didn't have CD drives. Now, I would prefer to not overwrite the install USB sticks all the time, since it's handy to have them, but neither do I want to pile up USB sticks that I only need every 6 months. It would be great to have a bootable USB stick that fires up some minimal system, lets you choose an ISO image and then reboots from there. How would I go about this? Do I use some minimal Linux? Is there some kind of modified / specialized boot loader? Can I set up GRUB to do this? Should I use virtualization?

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• Setting up a git repository on a server

  - by lostInTransit

  Hi I read through the other git questions here but couldn't really follow whether they are trying to do the same thing as I am. So if you find any duplicates, please let me know. I have a central server with SSO installed. All my machines are connected through the lan to this server. I have also setup a remote git repository on this server. Now what I'd like to do is make the server act as a central repository. All my employees can commit their code to the server and the server pushes it to the remote git repository. Also can I integrate it with SSO in any way? Can someone please help me out with this process? I am new to git and still learning how to use it effectively. So a step-by-step process or an existing document which I can refer to for this? Thanks.

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• how to stream audio and video files, but use any media player on Windows (without using Windows file

  - by RamyenHead

  I want to access and play media files on machine S (Windows XP) from machine C (Windows XP). Using Windows File Sharing ("share this folder" stuff), if it works, I would share the folder containing media files on machine S, and I would be able to play media files, sitting in front of C, using any media player I want. Windows somehow ensures that the remote files behave like local files. But Windows file sharing won't work for me, is there any alternative? If two machines were both Linux, I would install an SSH server on S and use Nautilus from C to access and play media files. The reason why I can't use Windows file sharing is, my campus use two different subnets, I have S and C on different subnets and it seems that the firewall governing the whole network in campus doesn't allow file sharing between different subnets. I tried changing Windows Firewall settings on S to allow C in, it still wouldn't work, so it must be the other firewall.

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• VMware ESXi 4 On-Disk Data Deduplication - possible and supported?

  - by hurikhan77

  Environment: We are running multiple web, database, and application servers which usually share a pretty common installation (gentoo linux) and similar configuration in VMware ESXi 4. The differences are usually only some installed features or differing component versions. To create a new server, I usually choose the most similar (by features) running server, rsync a copy of it into freshly mounted filesystems, run grub, reconfigure and reboot. Problem: Over time this duplicates many on-disk data blocks which probably sums up to several 10's of gigabytes. I suppose if I could use a base system as template with the actual machines based on top of that, only writing changed blocks to some sort of "diff image", performance should improve (increased cache hit rate) and storage efficiency should increase (deduplicated storage space). This would be similar to what ESXi already supports for RAM deduplication (page sharing). Question: Is there any way to easily do this on ESXi 4? I already share the portage tree via NFS but this would not work for the rootfs.

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• How to do complex port forwarding (sort of)

  - by adnan kamili

  I have a very different situation. My laptop named A, another machine B(ip-172.16.28.3) with ssh server installed and i have an account on that machine, the third machine C(ip-172.16.24.3) is a proxy server. All the machines are within a LAN, but 1- Machine B can connect to A as well as C 2- Machine A i.e.my pc, it can only connect to B and not C Now to use internet, i do the following: ssh -X [email protected] Then i type firefox and i use the firefox of machine B with proxy setings as 172.16.24.3:3128 Instead of using firefox of B, i want to use my local firefox. Is there a way through which i can connect to C via B and use my local firefox for browsing

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• Freebsd 7.2: View firmware version for disks?

  - by Stefan Lasiewski

  I'm running FreeBSD 7.2, with Seagate Cheetah (Model ST####) drives. We are having some problems with the SCSI drives on these machines. Our vendor says that updating the firmware on the drives may fix the problems, and a firmware update did seem to fix some SCSI problems on another FreeBSD host. How can I view the firmware version of these drives? I tried some tips from nixCraft, but nothing has worked so far. In dmesg, I see the Make and Model, but In Linux, this information is often in /var/log/dmesg (Although /var/log/dmesg is sometimes out of date), or I often find this information with something like sudo lshw -class disk, lshal or dmidecode.

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• Windows 7 stopped connecting to samba share

  - by Jan

  I have a problem with Windows 7 Home connecting to samba on linux server. It's worked fine for a year and without any changes in configuration or updates it suddenly stopped working. The strangest thing for me is that it stopped working for no reason that I could think of. After a few minutes after trying to connect I get: \\ip is not accessible. You might not have permission to use this network resource. Contact the administrator of this server to find out if you have access permissions. Other computers in that network (XP machines) connect to samba without any problem. I've tried adding LmCompatibilityLevel as described here: http://www.tomshardware.com/forum/75-63-windows-samba-issue , but it didn't help.

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• Virtualization of desktop

  - by Agares

  Hi! I'm thinking about virtualization of my laptop(for educational purposes). My idea is to install very light host OS and have all the rest as virtual machines. Microsoft's Hyper-V Standalone would be very good solution, but it's impossible to access virtual machine from computer, where the Hyper-V is the host(isn't it?). So, which virtualization software would be good for me? I wanna have virtualized Windows 7(and maybe some other windowses). My processor support Intel Virtualization Technology.

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• Regression testing for firewall changes

  - by James C

  We have a number of firewalls in place around our organisation and in some cases packets can pass through four levels of firewall limiting the flow TCP traffic. A concept that I'm used to from software testing is regression testing, allowing you to run a test suite against a changed application to verify that the new changes haven't affected any old features. Does anyone have any experience or an offer any solutions to being able to perform the same type of thing with firewall changes and network testing? The problem becomes a lot more complicated because you'd ideally want to be originating (and testing receipt) of packets across many machines.

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• Giving a scanner-printer-combo a zoom function when copying ?

  - by ldigas

  You know how everytime you go to a photocopying shop, photocopiers always have a neat zoom function (it can take whatever you give it, and zoom it in/out, so your copy comes out smaller or larger). I got one of those neat 3-in-one printer machines. It has a copy button on it, but it also has some software that comes with it (Epson SX115 to be exact is the model). Apart from going into some photo manipulation application, is there some way (software) to give it that feature. So, in short, I need something that can scan a page, scale it to let's say, a quarter of its size, and then print it out ? Anyone knows of anything like that ?

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• Best Guest OS for running freeswitch under Proxmox

  - by Frank Waller

  We have a lot of asterisk Systems running on dedicated machines and would like to use freeswitch to replace a number of them. One of the advantages of freeswitch is supposed to be that it is doing much better in a virtualized environment than asterisk is. However I can find very little information about people using it in Proxmox containers. I would like to know if anyone has seen any ready to run proxmox images that include freeswitch so we can test a number of things without having to deeply go into creating our own. Or at least a clue to which system images/distro images we can use to quickly get it installed not having to deal with too many dependency or different Linux version issues. Just to be clear: It should be for a more or less current Proxmox and current freeswitch. I am not looking forward to use the KVM mode but would consider it, if it is otherwise ready to run out of the box. I would rather use a real OpenVZ based container. Thanks for anyone helping!

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• Suggested benchmark for testing CPU footprint of antivirus software

  - by Alex Chernavsky

  Our organization is currently running Symantec Corporate Antivirus, which is rumored to be a big resource hog. I know that we do have a lot of older machines that are running slow. Our PCs are all running Windows XP Pro and are used only for business applications (mostly Microsoft Office), e-mail, and web surfing. They're not used for gaming (one would hope not, anyway). I'd like to take one of the old PCs and do a speed benchmark test while it's running Symantec AV, then another test with no antivirus, and a third test with ESET NOD32. As I said, I don't care much about graphics performance. What would be an appropriate benchmarking program program to use? Freeware is best, of course. Thank you for considering my question.

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• Mongodump on Gridfs is killing the host IOs

  - by Raphael

  I'm trying to make a mongodump from our production mongodb while the production is running. We have three production instances, one regular mongodb, one with very few gb of data on gridfs, one with a larger amount of data on gridfs. All mongodb instances are running in version 2.4.9 on a ubuntu 10.04 virtual server. I use a mongodump command to export the bases to another server. Unfortunately our machines are virtually hosted in a "low performances" datacenter (vmware based) so when I try to export the large gridfs db, the disk IO hits 100% (and 50% of the cpu starts waiting for IO too). This has a very negative impact on the production applicatiosn because db access time is excessively increased, making the applications unusable. I'm looking for a way to regulate the mongodump so the export goes slower but cooler on the hardware ressources allowing better performances for the applications to run. Has anyone had a similar scenario ?

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• Mikrotik queues and limiting total upstream bandwidth

  - by g18c

  With a Mikrotik router (form of embedded Linux) I have created simple queues per machine matched by source IP address. Each of the 4 machine queues has an unlimited burst 3Mbps/3Mbps for Tx/Rx. During speedtest.net on all 4 machines at the same time, each machine shows 3Mbps (and is limited correctly there), however the total bandwidth on the uplink goes to 12Mbps (i need to set this to 10Mbps max for the upstream). I want to restrict the actual traffic passing across the uplink port to 10Mbps regardless of what the other queues are doing (I need this catch all queue to have the final say on the uplink speed). For example I need: Scenario A Machine A transferring @ 3Mbps Machine B transferring @ 3Mbps Machine C transferring @ 3Mbps Machine D transferring @ 0Mbps Up-link speed = 9Mbps Scenario B Machine A trying to transfer @ 3Mbps Machine B trying to transfer @ 3Mbps Machine C trying to transfer @ 3Mbps Machine D trying to transfer @ 3Mbps Up-link speed = 10Mbps Actual transfer speed of machine A,B,C,D = 2.5Mbps This is to allow slight over subscription of bandwidth queues as not all will be transmitting at 3Mbps all the time. Is this possible and if so how would one go about doing this?

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• Kill xserver from command line (init 3/5 does not work)

  - by John Smith

  Hi, I'm running Linux Mint 10, although I've had this same issue with other variants of Linux. I've been told/found while researching that if the X server hangs or otherwise errors, one can drop to a root prompt, usually at another tty, and execute init 3 (to drop to single user mode) and then init 5 to return to the default, graphical session. Needless to say, I've tried this before in multiple configurations on multiple machines to no avail. The only feedback I receive form executing those two commands is a listing of VMWare services (from a kernel module) that are stopped and then restarted. Note: If I run startx (either before or after init 3), then I am told that the xserver is still running and that I should remove /tmp/.X0-lock. Having tried that, it removes that error message, but claims that the xserver cannot be attached as another instance is running. How do I kill the xserver completely? Can I killall some process name?

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• How can I make Windows XP bootable again?

  - by Scott Severance

  Some time ago, I replaced my hard drive. Foolishly, I imaged the individual partitions, not the entire drive. That meant that my system was unbootable. For my primary OS (Linux), that was no problem as I could simply re-run GRUB. However Windows XP remains unbootable. The machine in question is a netbook which doesn't have a CD drive or a restore partition, so I can't boot from a Windows CD and run fixmbr. How can I fix Windows? Here's a picture of what I see when I try to boot Windows from the GRUB menu: I don't actually have an XP CD, since of my two machines, the netbook in question has neither a restore partition nor a CD, and my other XP machine only came with a restore partition. So I'll also need a way to get hold of the necessary files.

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