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• Slave/secondary DNS nameserver

  - by user114671

  I'm learning about DNS and have a very basic, generic question about DNS but I can't find an answer anywhere. I have DNS for a few domains set up as follows: - master records with DNS company A - slave records with DNS company B Company A's nameservers are: ns1.companyA.com. ns2.companyA.com. ns3.companyA.com. ns4.companyA.com. ns5.companyA.com. and company B has three slaves: ns6.companyB.com. ns7.companyB.com. ns8.companyB.com. Everything works fine transferring the records between the nameservers and keeping them in sync. But my question is: The registrar of my domain example.com allows me to choose 4 nameservers only. Do I just pick the first 4 for company A, or do I need to include 1 or more of company B's slave nameservers too?

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• HP LaserJet Pro 400 Color M451dn Phantom Print Jobs

  - by francisswest

  Scenario: Multiple printers hooked up to a printer server (2008r2) including this HP LaserJet Pro 400 Color M451dn. All machines that are using the printer are based on Windows 7 Enterprise x64. Problem: Every couple of days the users who frequent this printer let me know that a few dozen pages with random characters down one side of the paper print out. This happens usually during the evening when no one is around to send print jobs to it. What I have done: Provided the below screen shot of the printer log with what I assume is the print jobs in question. I have looked into the printer driver compatibility and found no issues. Question: Is there a known issue with this printer or similar printers, and is there a solution that people are familiar with when they see multiple pages of gibberish printing out?

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• hardware addressing and configurable addressing scheme

  - by Zia ur Rahman

  basically i want to ask question about configurable addressing scheme for LAN interface hardware. i have read about it from a book, some main points are given by a configurable addressing scheme provides a mechanism that a customer can use to set a physical address.The mechanism can be manual (the switches that must be set when the interface is first installed).or an electronic memory such as an EPROM that can be downloded from the computer(what does this means). Most hardware needs to be configured only once- configuration is usually done when the hardware is first installed. Question:Suppose a network administrator configures the LAN interface hardware (assigns the address) when he installs it. Now later on if he needs to change the physical address of the device can he change it? Or in this addressing scheme the hardware can only be configured once and we can not reconfigure it later on.

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• What is a good WordPress theme for long Objective-C code samples [closed]

  - by willc2

  As some of you iPhone developers know, Objective-C can be a verbose language. Long, descriptive variable and method names are the norm. I'm not complaining, it makes code easier to read and code completion makes it easy to type. But damn! Check out this method name for getting a cell in a table view: -(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath; I have a WordPress blog where I publish my code samples as I'm learning the language. One thing I hate on other blogs is how the code won't fit in a column without that scroll bar or without wrapping around. It really made it hard for me to read and comprehend method names back when I was a super-noob (six months ago). Right now I use the clean-looking Fazyvo 1.0 theme by noonnoo. I love the look of it but the columns are just too narrow and it doesn't have support for wider ones. I could hand-modify it but then I'd have to maintain/redo those changes every time I updated it. Instead, I'm looking for a nice theme that has width control built-in and looks good at larger font sizes. Can anyone help? Note: I use WP-CodeBox for code syntax highlighting.

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• Connecting jconsole using SOCKS to Amazon EC2

  - by freshfunk

  I'm trying to use jconsole to view stats on an EC2 instance by using a socks proxy created by SSH. I've tried the various scripts mentioned in the links below but to no avail: http://simplygenius.com/2010/08/jconsole-via-socks-ssh-tunnel.html http://gabrielcain.com/blog/2010/11/02/using-ssh-proxying-to-connect-jconsole-to-remote-cassandra-instances/ I'm running ssh -f -ND 8123 myuser@mymachine and verified that at least Firefox goes through it as a proxy. I then run jconsole -J-DsocksProxyHost=localhost -J-DsocksProxyPort=8123 service:jmx:rmi:///jndi/rmi://ec2-XX-XX-XXX-XXX.compute-1.amazonaws.com:8080/jmxrmi I run netstat -n on my EC2 instance and I see a connection created by my machine. However, the connection eventually disappears and I get a 'channel 2: open failed: connect failed: Operation timed out' from my ssh tunnel. I've opened the jmx port through the security group and I've checked the port on the EC2 instance to make sure it's open (by telnet-ing to it). I'm not sure where to look next. Are there some properties in sshd_config or ssh_config I need to enable for tunneling? Or anything in Mac OS X? I feel like a serious noob but sys administration is really not my strong point. I've spent several hours and can't get this to work.

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• Network monitoring solution

  - by Hellfrost

  Hello Serverfault ! I have a big distributed system I need to monitor. Background: My system is comprised of two servers, concentrating and controlling the system. Each server is connected to a set of devices (some custom kind of RF controllers, doesnt matter to my question), each device connects to a network switch, and eventually all devices talk to the servers, the protocol between the servers and the devices is UDP, usually the packets are very small, but there are really a LOT of packets. the network is also somewhat complex, and is deployed on a large area physically. i'll have 150-300 of these devices, each generating up to 100+ packets per second, and several network switches, perhaps on 2 different subnets. Question I'm looking for some solution that will allow me to monitor all this mess, how many packets are sent, where, how do they move through the network, bandwidth utilization, throughput, stuff like that. what would you recommend to achieve this? BTW Playing nice with windows is a requirement.

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• Is there a command line (or autohotkey) way of dismounting a USB drive?

  - by justintime

  I find dismounting a USB drive takes far too many mouse clicks for my liking. Is there are command line way of doing it (XP and Vista)? Addition I have an eye condition that makes hand mouse coordination difficult so any suggestion that there aren't too many clicks will be downvoted as not answering my question. However I use AutoHotkey a lot and one use case would be to call it from an AHK script. So if there is a way to code it in AHK that will do. Added this to the tags. Further question - is it safe to remove a disk when the computer is a. on Standby or b. Hibernated. I recall that W2000 got uspet if you pulled a disk from a hibernated machine. Or is it better to explicitly dismount or sync before you hibernate or standby - prabably in a script.

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• Multisession burn in Imgburn

  - by blntechie

  Is Multisession burn available in Imgburn? If not, any idea whether it will be implemented in future? I almost recommended Imgburn instead of Nero or Roxio to one of my friend. He requires multisession burning and I found no options to enable it,if available in Options. Note: Please don't question the question. Like, Why would you want multisession anyway? or Isn't USB stick/RW Disk is what you need instead of a RO CD/DVD? Please keep the answers in context. I know that I can use USB sticks instead of CD/DVD and my friend require mulisession anyway. May be I can ask him to keep Nero as a backup for this purpose if Imgburn don't support this.

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• Time between AWS Notifying of Scale Down and Terminating instance

  - by SteveEdson

  Here is the scenario, there are multiple EC2 instances behind a load balancer. When traffic dies down, the SCALE_DOWN policy is triggered from a CloudWatch alarm. What I would like, is for the instance that is going to be terminated, or a separate server altogether, to be able to run a quick script that will execute a few commands to ensure all data has been transferred. My initial question was going to be how can I send a notification when an instance is going to be terminated by an auto scale, SCALE_DOWN policy. But then I saw this question Amazon EC2 notifying the instance when the autoscale service terminates it. If the notification is sent, how much time is there before the instance actually gets terminated? Are there any parameters to specify this time? Would it be a better idea to notify an instance that it is no longer needed, and get the instance to terminate itself once it has finished running the final script? Or, am I making this into a bigger problem than it actually is, and theres a far simpler solution?

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• SSL certificate for FTPS, is it the same as for HTTPS?

  - by BlackTigerX

  This question is about "FTP over SSL", if I understand correctly FTPS and HTTPS are just the standard FTP and HTTP protocols running on top of SSL, is this correct? The actual question is: is the certificate that you use for FTPS the exact same that you can use for HTTPS? or are there any differences? To give you some context, I need to get a certificate for an FTPS server, I know I can generate one but it needs to be from an certificate authority, I just need to make sure that I can use the same type of certificate that we use here for HTTPS, otherwise need to know what type of certificate I need to get

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• Creating a chain of certificates

  - by StackedCrooked

  This question is a follow up to my previous question, which was, in retrospect, not completely answered: http://superuser.com/questions/126121/how-to-create-my-own-certificate-chain. I'll represent my certificate chain like this: ROOT - A - B - C - ... I am now able to create the ROOT and A certificates, but I didn't succeed in continueing the chain. My command for creating the root certificate is: openssl req -new -newkey rsa:1024 -nodes -out ca.csr -keyout ca.key openssl x509 -trustout -signkey ca.key -days 365 -req -in ca.csr -out ca.pem Certificate A: openssl genrsa -out client.key 1024 openssl req -new -key client.key -out client.csr openssl ca -in client.csr -out client.cer This command depends on the root certificate implicitly using the data found in the openssl config file. Certificate B will only rely on A, so the previous command won't work here. How can I complete the chain?

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• Blocking a country (mass iP Ranges), best practice for the actual block

  - by kwiksand

  Hi all, This question has obviously been asked many times in many different forms, but I can't find an actual answer to the specific plan I've got. We run a popular European Commercial deals site, and are getting a large amount of incoming registrations/traffic from countries who cannot even take part in the deals we offer (and many of the retailers aren't even known outside Western Europe). I've identified the problem area to block a lot of this traffic, but (as expected) there are thousands of ip ranges required. My question now (finally!). On a test server, I created a script to block each range within iptables, but the amount of time it took to add the rules was large, and then iptables was unresponsive after this (especially when attempting a iptables -L). What is the most efficient way of blocking large numbers of ip ranges: iptables? Or a plugin where I can preload them efficiantly? hosts.deny? .htaccess (nasty as I'd be running it in apache on every load balanced web server)? Cheers

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• Are there any sFTP clients that support a proxy that uses NTLM authentication?

  - by Iraklis

  The title pretty much summarizes the question. We have deployed an sFTP server that needs to be accessed from our client's MS Windows Pc's that reside within a restricted local area network. The only way they can get out for their Intranet is to use an HTTP proxy that requires NTLM authentication. From what I understand all open-source sFTP clients (FilleZilla,WinSCP,etc) do NOT support NTLM authentication (Because of legal issues). I know that there are workarounds to this (installing a local proxy at the machine that understands NTLM) but this would break all sorts of security policies of our client. So my question is : Does anyone know of any sFTP client that supports a NTLM Proxy?

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• Finding Image resolution in PDF file?

  - by Dave

  I have a problem of having some users creating very large PDFs. On the other hands I have PDF sent from our fax machines that are really small in size and totally printable. My question is Is there any way I can find the resolution (DPI) of the PDF. I search the internet, could not find any answer. Checked the properties of the file, this information was not stored there, at least in my case. What is the optimum resolution of converting text file into image PDF. 96dpi, 300dpi or more ? Fun question. Can I resize a PDF which was scanned with high dpi into smaller dpi? I know some answers might not be available as I have already searched the internet and could not find answers. Note: My PDF are entirely images, text to images. I am also familiar with primoPDF (free) something you can experiment with

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• How to share a VPN connection in a VMWare Guest VM with the Host

  - by Jonathan

  The need - This question is relevant for all of those who want to bypass their corporate's annoying VPN, and access their work/corporate network from their private computer, especially if the corporate VPN client software can't run on their private computer. Homework: this question is very similar to this one and this one, which aren't answered :( The challange - Can't run the corporate VPN client from the private computer, so converted the work laptop to a VMWare Virtual Machine. The VPN client is working fine inside the Guest VM, now we want to share it with the Host (the private computer) The specs: * The private computer (Host OS) is Mac OS X Lion 64bit * The corporate laptop (Guest VM) is WinXP 32bit, running in Bridged network mode * The VPN client on the Guest VM is is Checkpoint SecuRemote NGX R60 HFA03 * While the VPN is running in the Guest VM, the Host can still ping the Guest and vice versa

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• How to fetch a cpu status thought net-snmp

  - by Steve.DC.Tang

  I want to fetch a device's cpu and memory status thought net-snmp. I get my device's info with this command: snmpwalk -v 2c -c public 210.38.xxx.xxx system And I got this info: SNMPv2-MIB::sysDescr.0 = STRING: Ruijie High-density IPv6 10G Core Routing Switch(S8606) By Ruijie Network SNMPv2-MIB::sysObjectID.0 = OID: SNMPv2-SMI::enterprises.4881.1.1.10.1.43 DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (1978814424) 229 days, 0:42:24.24 SNMPv2-MIB::sysContact.0 = STRING: SNMPv2-MIB::sysName.0 = STRING: S8606 SNMPv2-MIB::sysLocation.0 = STRING: SNMPv2-MIB::sysServices.0 = INTEGER: 7 Now I want to fetch the cpu status, and I search my question on Google, somebody offer a oid for query the cpu status: snmpwalk -v 2c -c public 210.38.xxx.xxx usageOfCPU But it doesn't worked : No log handling enabled - using stderr logging usageOfCPU: Unknown Object Identifier (Sub-id not found: (top) - usageOfCPU) Somebody told me some switch has its private MIB, and you can use it to see its CPU status, is that right? I hope someone can solve me question......

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• Mac OS X: Trying to install prolog using fink

  - by sixtyfootersdude

  I am trying to install prolog on Mac OS X 10.4.11. I just downloaded fink because I think that that should help me and I am trying to get either: Package swi-prolog-5.8.1-2 or Package gprolog-1.3.1-1 But I am not having any luck. Here is what I was doing: % fink install swi-prolog-5.8.1-2 Information about 1723 packages read in 0 seconds. Failed: no package found for specification 'swi-prolog-5.8.1-2'! % Question 1: Are these what I want to download? Question 2: Why isn't fink working?

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• OS X Snow Leopard, change file permissions on copy

  - by Francesco K

  I work with OS X, Snow Leopard and need to allow users to make copies of files (templates) located in a read-only repository for subsequent editing. The repository is located on a separate physical drive mounted to the OS X boot volume. As this is a shared computer in a school environment, all users access the machine via a single login ("user_local"). Whether using POSIX permissions or ACLs, the use case requires the file permissions to change from "read" to "read write" as they get copied to the "user_local" home directory. Googling around has not yielded anything that would indicate that this is possible via the Snow Leopard permission system. Question 1: Is this in fact possible via the permission system? If so, how? Question 2: If not possible, how would one go about solving this problem? I imagine this to be a fairly common use case so there must be a workable solution for it out there. Thanks.

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• forced reformat without login / and bootcamp

  - by debug

  ok.. im pretty good with stuff like this, but I have a question. I have mac mini with 10.5.(x) on one partition, and bootcamp (windows) on the other. My boss wants me to reformat the whole mac (10.6 (x)), which is usually easy. He does not remember his password to login, which means I cannot log in and allocate the bootcamp back to one partition using Disk Utility, then reformat the whole drive. When I insert the Snow leopard CD, I can only wipe out one partition, my question is: Is there a way to force a wipe out of both drives in the boot sequence? Any help to wipe out this whole drive and do a clean install would be helpful.. Thanks superusers!

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• Connection string during installation

  - by anon2009

  Hi, I've been convinced to use windows setup files(msi) for the installation of my new windows forms application after I asked a question here and got some excellent answers (thank you all): http://serverfault.com/questions/97039/net-application-deployment Now i have a different question: My application will need to access a SQL Server to provide users with data, which means that the connection string must be stored in the client's app.config file. How should I handle this? During installation, the user enters the connection string to that database? How they get the connection string? In an email from the admin? What if the admin wants to use SQL authentication and need to put the user info at the connection string? So you know, the app will be sold via the internet, so I don't have any access to the admins or the network. Any suggestions? Thanks in advanced.

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• IP Address on internet access shared over ad-hoc wifi network

  - by Jacxel

  The Situation When im staying at my girlfriends we both like to have internet access on our laptops but her accommodation don't allow wireless routers. My Question My question is if I set up an Ad-Hoc network to share the internet connection as shown here on How To Geek. Will my laptop be acting as a wireless router or will the connection all go through my laptop as one ip address so it appears to be my computer accessing the webpages etc, that my girlfriend actually is. i would be interested in knowing any additional information that could help sove this problem eg. if connectify would do what i want.

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• How can I check whether a volume is mounted where it is supposed to be using Python?

  - by Ben Hymers

  I've got a backup script written in Python which creates the destination directory before copying the source directory to it. I've configured it to use /external-backup as the destination, which is where I mount an external hard drive. I just ran the script without the hard drive being turned on (or being mounted) and found that it was working as normal, albeit making a backup on the internal hard drive, which has nowhere near enough space to back itself up. My question is: how can I check whether the volume is mounted in the right place before writing to it? If I can detect that /external-backup isn't mounted, I can prevent writing to it. The bonus question is why was this allowed, when the OS knows that directory is supposed to live on another device, and what would happen to the data (on the internal hard drive) should I later mount that device (the external hard drive)? Clearly there can't be two copies on different devices at the same path! Thanks in advance!

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• Reverse bash console text flow

  - by radman

  Hi, This is a bit of a weird question and I'm not sure that there is any easy answer to it but I am very interested in finding a solution. So when I work on a linux machine via a console I find that I am constantly staring at the bottom of the screen, as once you have executed a bunch of commands text fills toward the bottom. Now I find that this is decidedly not good for my neck and it would be far better if instead of scrolling to the bottom, the text would scroll to the top instead. So does anyone out there know if there is a way to reverse the direction text appears in a console? (note that i am aware of the clear command) Example: default behaviour user@machine:~$ command 1 user@machine:~$ command 2 user@machine:~$ command 3 user@machine:~$ __active_prompt__ desired behaviour user@machine:~$ __active_prompt__ user@machine:~$ command 3 user@machine:~$ command 2 user@machine:~$ command 1 Running Kubuntu 10.04 using Konsole I realise this is an odd question, thanks for any help.

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• What parameters to mdadm, to re-create md device with payload starting at 0x22000 position on backing storage?

  - by Adam Ryczkowski

  I try to recover from mdadm raid disaster, which happened when moving from ubuntu server 10.04 to 12.04. I know the correct order of devices from dmesg log, but given this information, I still cannot access the data. The superblocks look messy; the mdadm --examine for each disk is on this question on askubuntu By inspecting the raw contents of backing storage, I found the beginning of my data (the LUKS container in my case) at position 0x22000 relative to the beginning of the first partition in the raid. Question: What is the combination of options issued to "mdadm --create" to re-create mdadm that starts with the given offset? Bitmap size? PS. The relevant information from syslog when the system was healthy are pasted here.

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• How to obtain a count of open files from server, hosting an NFS share

  - by Aaron

  Question: How to obtain a list/count of open files, by NFS clients, from NFS server on Solaris 10

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