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  • How do I prevent internet access to a group of computers on my network?

    - by Kevin Boyd
    Well I have the following setup... Computer A , B and C are networked.... Computer A is connected to the internet, computer B and C are not setup for internet access currently but I guess its possible with some kind of setting they would eventually be able to access the internet and this is what I would like to prevent. In summary only A should have internet access while A and B and C should still be on intranet. Is this kind of config possible?, what kind of software or setup or tools would I need to achive this?

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  • supervise/daemontools conflicts with apache -D FOREGROUND

    - by Kevin G.
    Hoping that somebody can help us understand this behavior. We've got a bunch of daemontools services under /etc/service/. One of the services controls apache, and the run script has this in it. exec envdir /var/lib/supervise/wwwproxy/env setuidgid root bash <<-BASH ulimit -n 8192 # also increase the running user's file descriptor limit exec apache2 -f /path/to/demo_apache2.conf -D FOREGROUND BASH We were having the problem that svc -d /etc/service/* actually had the effect of restarting all the services, it didn't take them down. We finally tracked it down to that one service, and found that svc -d /etc/service/apache2 would bring up any other service was down, including itself. Changing FOREGROUND to NO_DAEMONIZE fixes the behavior, but we'd really like to understand what's going on. Can anybody explain why an svc -d on one service would bring an other service up? Thanks for any clue you can offer.

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  • Routing using Linux with 2 NIC cards

    - by Kevin Parker
    Configured Clear OS to be in Gateway mode on a machine with two NIC cards. eth0:192.168.2.0/24 with ip 192.168.2.27 which is connected to a modem and thus have internet connectivity. eth1:192.168.122.0/24 with ip 192.168.122.10 which is connected to other machines in LAN through switch. LAN machines with network 192.168.122.0 is not getting internet.How can they get internet Through Clear OS gateway.I have enabled packet forwarding in clear os using "ip_forward=1" What am i missing?.Can you please help me in this. Following are the static routing i have added: on LAN machine1 with ip address 192.168.122.11 ip route add 192.168.2.0/24 via 192.168.122.10 dev eth0 ip route show 192.168.2.0/24 via 192.168.122.10 dev eth0 192.168.122.0/24 dev eth0 proto kernel scope link src 192.168.122.11 But still 192.168.2.0/24 network is not reachable.Where can be the problem??

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  • Wifi interference tool for Mac

    - by Kevin Burke
    This Server Fault blog post shows some tools you can use to view interference on your wireless network: blog.serverfault.com/2012/01/05/a-studied-approach-at-wifi-part-2/. They mention Vistumbler, which only works on PC's. Is there a similar tool I can use to measure wireless interference on a Mac? Also, is it better to be on a channel with many AP's, each with a weak signal, or on a channel with only a few AP's, but a strong signal?

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  • ssh works fine when using public interface, but slow when using private interface

    - by Kevin M
    My Linux(UbuntuEEE) to Linux(CentOS) ssh takes a long time to log in(~15 seconds) when using the private interface, but not when using the public one. I have a Linux box acting as my router. As such, it has multiple interfaces(75.xxx.xxx.xxx, 192.168.1.1). I can ssh in from the internal interface(192.168.1.65 to .1), but it will take a while. I can ssh into the public address, and it goes quickly(~1 second). I have another box that I can ssh into the inside interface from and it goes quickly. iptables is set to accept packets coming into the interface immediately. sshd's UseDNS is normally on; I get the same problem if I turn it off and restart sshd. I normally use public-key authentication; I have done a mv ~/.ssh/ ~/ssh/ and it will ask me for a password after going slowly. After logging in(using either interface), speed is quick. ssh client version(via ssh -v):OpenSSH_4.7p1 Debian-8ubuntu1.2, OpenSSL 0.9.8g 19 Oct 2007 ssh server version(via rpm -qv openssh_server):openssh-server-4.3p2-29.el5

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  • How to disable text overwrite mode in Netbeans (CentOS)?

    - by Kevin Lee
    Everytime I type some text, it is overwriting what I have typed. I assume that the mode is set to overwriting, I want to insert the text not overwrite it, but I can't disable it because my insert key is mixed up with my delete key so everytime I enter insert to disable the overwrite mode, it just delete what I type. So how to disable this? I'm using centOS.. and it seems that my problem is only related to Netbeans because when I type here, it is set to insert mode.. but in Netbeans, it just overwrites the codes! help!

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  • Why does my laptop shut down, does it get too hot?

    - by Kevin P.
    When I play games, or use powerful-applications such as Autodesk Maya, my laptop just shuts down, ofcourse without any warning at all. This is what I've tried so far: Cleaned my fan, completely! Checked if I have enough RAM and good enough graphics card, and I do. (6 GB RAM, Nvidia GeForce GT540M with 2 GB VRAM) None of these options worked. Even tried to clean my fan twice! Now, I have some options I could also try, but I don't know if that have anything to do with it or not. I was thinking reinstalling my Windows 7, because maybe it has to do something wrong with the installation? My laptop is about a year old, and this problem just happend out of no where, short after I downgraded from Windows 8 Release Preview to my original Windows 7.

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  • CPU running at full capacity when boot to DOS?

    - by Kevin H
    Does the CPU is run at 100% or near full capacity when the computer is booted into MS-DOS? Will the CPU temperature become higher even though we are not running any program in DOS mode? In Windows, we can see the CPU usage in % of utilization in Task Manager. From what I heard, CPU is running at near 100% capacity in DOS OS or in the BIOS MAIN screen. Is this caused by lack of CPU optimization in DOS OS?

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  • Is it better to check if file exists before deleting it

    - by Kevin Fegan
    Sometimes when I want to delete a file (from within a script), I will just delete it rather than checking if it exists first. So I do this: $ rm "temp.txt" 2>/dev/null Instead of this: [ -f "temp.txt" ] && rm "temp.txt" I just feel it's a waste of time to go and check if the file exists and return an exit code. So, perhaps it's quicker to do it the first way, especially if most of the time, the file is likely to be present. Are there any other advantages (or downsides) to do it one way or the other? Am I wrong to think it will ever be quicker?

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  • Desktop speakers with headphone port and separate volume controls

    - by Kevin L.
    I currently use the excellent Logitech X-230 desktop speaker/subwoofer set, which I love for the volume dial on the front which gives me a nice, quick, tactile control of my sound without requiring a remote or keyboard buttons or some awkward software slider. Additionally, there's a very convenient headphone jack right next to the volume dial but the volume dial only controls the speakers, leaving the headphones at full volume. The goal is to be able to adjust the sound in my headphones without having to fumble around and find an inline headphone volume control (and my current favorite pair doesn't even have one). Is anyone aware of a desktop speaker set that has convenient volume controls for both levels?

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  • Installed IE8 & SP3 on XP now I can't HTTPS from any browser

    - by Kevin
    The computer is Windows XP Professional SP3 with IE8. On the Tools Options Connections the "Settings" is GRAYED OUT (I am an admin on the machine) Any browsing of https:// addresses results in IE displaying the following: "this program cannot display the web page" After installing an alternate browser and trying the same https:// address I get a similar error message. I have tried using Compatibility View Settings to for all web pages and this has no effect on the problem. HTTP addresses work fine, I can PING sites such as google.com without issue. Question: What could be preventing me from getting at the settings to check to see if I'm using a proxy? What else could be preventing HTTPS access?

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  • Should I use nginx exclusively, or have it as a proxy to Tomcat (performance related)?

    - by Kevin
    I've planned to create a website that'll be pretty heavy on dynamic content, and want to know what would be the wisest choice for part of my webstack. Right now I'm trying to decide whether I should develop upon nginx, using PHP to deliver the dynamic content, or use nginx as a proxy to Tomcat and use servlets to deliver the dynamic content. I have a good amount of experience with Java, JSP, and servlets, so that's a plus right off the bat. Also, since it is a compiled language, it will execute faster than PHP (it is implied here that Java is around 37x faster than PHP) , and will create the web pages faster. I have no experience with PHP, however i'm under the impression that it is easy to pick up. It's slower than Java, but since the client will only be communicating with nginx, I'm thinking that serving the dynamically created web pages to the client will be faster this way. Considering these things, i'd like to know: Are my assumptions correct? Where does the bottleneck occur: creating pages or serving them back to the client? Will proxying Tomcat with nginx give me any of nginx performance benefits if I'm going to be using Tomcat to generate the dynamic content (keeping in mind my site is going to be heavy in this aspect)? I don't mind learning PHP if, in the end, its going to give me the best performance. I just want to know what would be the best choice from that standpoint.

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  • How to Set Up an SMTP Submission Server on Linux

    - by Kevin Cox
    I was trying to set up a mail server with no luck. I want it to accept mail from authenticated users only and deliver them. I want the users to be able to connect over the internet. Ideally the mail server wouldn't accept any incoming mail. Essentially I want it to accept messages on a receiving port and transfer them to the intended recipient out port 25. If anyone has some good links and guides that would be awesome. I am quite familiar with linux but have never played around with MTA's and am currently running debian 6. More Specific Problem! Sorry, that was general and postfix is complex. I am having trouble enabling the submission port with encryption and authentication. What Works: Sending mail from the local machine. (sendmail [email protected]). Ports are open. (25 and 587) Connecting to 587 appears to work, I get a "need to starttls" warning and starttls appears to work. But when I try to connect with the next command I get the error below. # openssl s_client -connect localhost:587 -starttls smtp CONNECTED(00000003) depth=0 /CN=localhost.localdomain verify error:num=18:self signed certificate verify return:1 depth=0 /CN=localhost.localdomain verify return:1 --- Certificate chain 0 s:/CN=localhost.localdomain i:/CN=localhost.localdomain --- Server certificate -----BEGIN CERTIFICATE----- MIICvDCCAaQCCQCYHnCzLRUoMTANBgkqhkiG9w0BAQUFADAgMR4wHAYDVQQDExVs b2NhbGhvc3QubG9jYWxkb21haW4wHhcNMTIwMjE3MTMxOTA1WhcNMjIwMjE0MTMx OTA1WjAgMR4wHAYDVQQDExVsb2NhbGhvc3QubG9jYWxkb21haW4wggEiMA0GCSqG SIb3DQEBAQUAA4IBDwAwggEKAoIBAQDEFA/S6VhJihP6OGYrhEtL+SchWxPZGbgb VkgNJ6xK2dhR7hZXKcDtNddL3uf1YYWF76efS5oJPPjLb33NbHBb9imuD8PoynXN isz1oQEbzPE/07VC4srbsNIN92lldbRruDfjDrAbC/H+FBSUA2ImHvzc3xhIjdsb AbHasG1XBm8SkYULVedaD7I7YbnloCx0sTQgCM0Vjx29TXxPrpkcl6usjcQfZHqY ozg8X48Xm7F9CDip35Q+WwfZ6AcEkq9rJUOoZWrLWVcKusuYPCtUb6MdsZEH13IQ rA0+x8fUI3S0fW5xWWG0b4c5IxuM+eXz05DvB7mLyd+2+RwDAx2LAgMBAAEwDQYJ KoZIhvcNAQEFBQADggEBAAj1ib4lX28FhYdWv/RsHoGGFqf933SDipffBPM6Wlr0 jUn7wler7ilP65WVlTxDW+8PhdBmOrLUr0DO470AAS5uUOjdsPgGO+7VE/4/BN+/ naXVDzIcwyaiLbODIdG2s363V7gzibIuKUqOJ7oRLkwtxubt4D0CQN/7GNFY8cL2 in6FrYGDMNY+ve1tqPkukqQnes3DCeEo0+2KMGuwaJRQK3Es9WHotyrjrecPY170 dhDiLz4XaHU7xZwArAhMq/fay87liHvXR860tWq30oSb5DHQf4EloCQK4eJZQtFT B3xUDu7eFuCeXxjm4294YIPoWl5pbrP9vzLYAH+8ufE= -----END CERTIFICATE----- subject=/CN=localhost.localdomain issuer=/CN=localhost.localdomain --- No client certificate CA names sent --- SSL handshake has read 1605 bytes and written 354 bytes --- New, TLSv1/SSLv3, Cipher is DHE-RSA-AES256-SHA Server public key is 2048 bit Secure Renegotiation IS supported Compression: NONE Expansion: NONE SSL-Session: Protocol : TLSv1 Cipher : DHE-RSA-AES256-SHA Session-ID: E07926641A5EF22B15EB1D0E03FFF75588AB6464702CF4DC2166FFDAC1CA73E2 Session-ID-ctx: Master-Key: 454E8D5D40380DB3A73336775D6911B3DA289E4A1C9587DDC168EC09C2C3457CB30321E44CAD6AE65A66BAE9F33959A9 Key-Arg : None Start Time: 1349059796 Timeout : 300 (sec) Verify return code: 18 (self signed certificate) --- 250 DSN read:errno=0 If I try to connect from evolution I get the following error: The reported error was "HELO command failed: TCP connection reset by peer".

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  • Change the title of a terminal (Gnome)

    - by Kevin
    I would like to customize the name of the tab in Tilda (I guess that it doesn't change anything from the Gnome-terminal's behavior), but I can't find the exact sequence ... so far, I figured out that Bash does it when displaying my PS1 prompt: echo $PS1 \[\e]0;HELLO\a\]\[\033[01;32m\]\u\[\033[00m\]@\[\033[1;35m\]\h\[\033[00m\]:\[\033[01;34m\]\[\033[00m\] I guess that \[\e]0;HELLO\a\] is responsible for the title to be set to 'HELLO', but when I start echo -ne "\[\e]0;HELLO WORLD\a\]" only writes '[]' what's wrong with my command ?

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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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  • Enabling "USB Printing Support" in Windows 7

    - by Kevin Dente
    I'm trying to use an old parallel-port based printer with a USB-to-parallel port adapter on Windows 7. When I plug it into the USB port on the computer it's listed as an unrecognized device. I know that these cables typically use the "USB Printing Support" driver with makes USB ports show up as printer ports in the printer dialog. Is there a way to manually add USB Printing Support to Windows 7, since it isn't being added automatically?

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  • ISA bus on newer computers

    - by Kevin Ivarsen
    Are there companies that sell new computers that support old ISA bus expansion cards? We have an aging computer running DOS that operates some machinery via an ISA interface board. Updated versions of this board (e.g. PCI, USB) are not available, and I am concerned about the long-term reliability of the 8+ year old computers we currently keep around as backups. If these newer ISA-capable machines exist, are there any general gotchas to be aware of in terms of compatibility with older expansion boards, ability to run DOS, etc.?

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  • Is there any way of preventing .csv files being converted into excel format

    - by Kevin Trainer
    I'm trying to work with an automated testing tool which can use .csv files as its data sourse. After saving a notepad file containing a number of fields and data seperated by commas as .csv it appears to have been converted to an excel file. When I run the test, only the first line of values is identified and can be run within the automated test. Not sure if this is expected with the testing product (www.badboy.co.au), but just wondered if there was a way of preventing excel from taking control of the .csv file? Any helpfull feedback would be great.

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  • PC won't boot from IDE HDD when SATA data drive connected

    - by Kevin
    I have an old Pentium 4 system running XP. The machine is set up as an HTPC. It was set up and running well with 1 SATA drive as a boot drive, another SATA drive to store TV recordings, and an IDE drive to store more recordings. Last week the original boot drive (a SATA drive) failed. The BIOS would no longer recognize it. I had a disused IDE drive hanging around that was large enough for the OS, so I reformatted it and installed XP on it. Now the system will only boot if I do not connect the remaining healthy SATA data drive. All three drives are recognized by the BIOS, and I have set the boot order so that the IDE drive with XP on it has top priority, but after the BIOS recognizes the drives, etc. I just get a black screen. I know the SATA drive is functional, because if I hot plug the drive AFTER the system is booted (I know I'm not supposed to do this), I can go into the control panels and mount the drive, and see all the files and folders on it in Windows Explorer. Any suggestions on what is going on and how to fix it? Many thanks.

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  • What happens to missed writes after a zpool clear?

    - by Kevin
    I am trying to understand ZFS' behaviour under a specific condition, but the documentation is not very explicit about this so I'm left guessing. Suppose we have a zpool with redundancy. Take the following sequence of events: A problem arises in the connection between device D and the server. This causes a large number of failures and ZFS therefore faults the device, putting the pool in degraded state. While the pool is in degraded state, the pool is mutated (data is written and/or changed.) The connectivity issue is physically repaired such that device D is reliable again. Knowing that most data on D is valid, and not wanting to stress the pool with a resilver needlessly, the admin instead runs zpool clear pool D. This is indicated by Oracle's documentation as the appropriate action where the fault was due to a transient problem that has been corrected. I've read that zpool clear only clears the error counter, and restores the device to online status. However, this is a bit troubling, because if that's all it does, it will leave the pool in an inconsistent state! This is because mutations in step 2 will not have been successfully written to D. Instead, D will reflect the state of the pool prior to the connectivity failure. This is of course not the normative state for a zpool and could lead to hard data loss upon failure of another device - however, the pool status will not reflect this issue! I would at least assume based on ZFS' robust integrity mechanisms that an attempt to read the mutated data from D would catch the mistakes and repair them. However, this raises two problems: Reads are not guaranteed to hit all mutations unless a scrub is done; and Once ZFS does hit the mutated data, it (I'm guessing) might fault the drive again because it would appear to ZFS to be corrupting data, since it doesn't remember the previous write failures. Theoretically, ZFS could circumvent this problem by keeping track of mutations that occur during a degraded state, and writing them back to D when it's cleared. For some reason I suspect that's not what happens, though. I'm hoping someone with intimate knowledge of ZFS can shed some light on this aspect.

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  • Copy an existing OS X install from another drive

    - by Kevin Burke
    I just bought a new solid state drive, and I'd like to copy all of the files and setup from my current Mac OS X hard drive onto it. What is the best way to do this? I have a 1TB external hard drive, my drive backed up on Time Machine, and Snow Leopard on a DMG, but no external mount for the SSD, and no install DVD (it's at my parents house, promise). I'm familiar with the command line and booting up Mac OS X from a hard drive.

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