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• Trying to determine the correct number of XFS allocation groups for postgresql server on Linux

  - by HBlend

  I am running a postgres 8.4.5 server on the linux 2.6.33.7 kernel on an 8 disk raid array with an LSI controller. Most of the tables are around 1GB or less. I know that XFS uses allocation groups (AG) to achieve I/O parallelism. My first question is, does this mean that if two tables are in the same AG, all I/O requests are queued to both of them if either is being read from/written to? If so, I assume I would want to spread my tables across as my allocation groups as possible, correct? Wouldn't this ensure that multiple users querying different tables would get the best performance?

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• My linux server takes more than an hour to boot. Suggestions?

  - by jamieb

  I am building a CentOS 5.4 system that boots off a compact flash card using a card reader that emulates an IDE drive. It literally takes about an hour to boot. The ultra-slow part occurs when Grub is loading the kernel. Once that's done, the rest of the boot process only takes about a minute to get to a login prompt. Does anyone have any suggestions? I suspect that it may have to do with UDMA. Everything IDE-related in my BIOS seems to checkout. The read performance hdparm is telling me 1.77 MB/s. Ouch! (But even at that rate, it still shouldn't take an hour to decompress and load the kernel) [root@server ~]# hdparm -tT /dev/hdc /dev/hdc: Timing cached reads: 2444 MB in 2.00 seconds = 1222.04 MB/sec Timing buffered disk reads: 6 MB in 3.39 seconds = 1.77 MB/sec Trying to enable DMA is a no-go though: [root@server ~]# hdparm -d1 /dev/hdc /dev/hdc: setting using_dma to 1 (on) HDIO_SET_DMA failed: Operation not permitted using_dma = 0 (off) Here's some command outputs that might help: System [root@server ~]# uname -a Linux server.localdomain 2.6.18-164.el5xen #1 SMP Thu Sep 3 04:47:32 EDT 2009 i686 i686 i386 GNU/Linux PCI info: [root@server ~]# lspci -v 00:00.0 Host bridge: Intel Corporation 82945G/GZ/P/PL Memory Controller Hub (rev 02) Subsystem: Intel Corporation 82945G/GZ/P/PL Memory Controller Hub Flags: bus master, fast devsel, latency 0 Capabilities: [e0] Vendor Specific Information 00:02.0 VGA compatible controller: Intel Corporation 82945G/GZ Integrated Graphics Controller (rev 02) (prog-if 00 [VGA controller]) Subsystem: Intel Corporation 82945G/GZ Integrated Graphics Controller Flags: bus master, fast devsel, latency 0, IRQ 10 Memory at fdf00000 (32-bit, non-prefetchable) [size=512K] I/O ports at ff00 [size=8] Memory at d0000000 (32-bit, prefetchable) [size=256M] Memory at fdf80000 (32-bit, non-prefetchable) [size=256K] Capabilities: [90] Message Signalled Interrupts: 64bit- Queue=0/0 Enable- Capabilities: [d0] Power Management version 2 00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #1 (rev 01) (prog-if 00 [UHCI]) Subsystem: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #1 Flags: bus master, medium devsel, latency 0, IRQ 16 I/O ports at fe00 [size=32] 00:1d.1 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #2 (rev 01) (prog-if 00 [UHCI]) Subsystem: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #2 Flags: bus master, medium devsel, latency 0, IRQ 17 I/O ports at fd00 [size=32] 00:1d.2 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #3 (rev 01) (prog-if 00 [UHCI]) Subsystem: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #3 Flags: bus master, medium devsel, latency 0, IRQ 18 I/O ports at fc00 [size=32] 00:1d.3 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #4 (rev 01) (prog-if 00 [UHCI]) Subsystem: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #4 Flags: bus master, medium devsel, latency 0, IRQ 19 I/O ports at fb00 [size=32] 00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2 EHCI Controller (rev 01) (prog-if 20 [EHCI]) Subsystem: Intel Corporation 82801G (ICH7 Family) USB2 EHCI Controller Flags: bus master, medium devsel, latency 0, IRQ 16 Memory at fdfff000 (32-bit, non-prefetchable) [size=1K] Capabilities: [50] Power Management version 2 Capabilities: [58] Debug port 00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev e1) (prog-if 01 [Subtractive decode]) Flags: bus master, fast devsel, latency 0 Bus: primary=00, secondary=01, subordinate=01, sec-latency=32 I/O behind bridge: 0000d000-0000dfff Memory behind bridge: fde00000-fdefffff Prefetchable memory behind bridge: 00000000fdd00000-00000000fdd00000 Capabilities: [50] #0d [0000] 00:1f.0 ISA bridge: Intel Corporation 82801GB/GR (ICH7 Family) LPC Interface Bridge (rev 01) Subsystem: Intel Corporation 82801GB/GR (ICH7 Family) LPC Interface Bridge Flags: bus master, medium devsel, latency 0 Capabilities: [e0] Vendor Specific Information 00:1f.2 IDE interface: Intel Corporation 82801GB/GR/GH (ICH7 Family) SATA IDE Controller (rev 01) (prog-if 80 [Master]) Subsystem: Intel Corporation 82801GB/GR/GH (ICH7 Family) SATA IDE Controller Flags: bus master, 66MHz, medium devsel, latency 0, IRQ 17 I/O ports at <unassigned> I/O ports at <unassigned> I/O ports at <unassigned> I/O ports at <unassigned> I/O ports at f800 [size=16] Capabilities: [70] Power Management version 2 00:1f.3 SMBus: Intel Corporation 82801G (ICH7 Family) SMBus Controller (rev 01) Subsystem: Intel Corporation 82801G (ICH7 Family) SMBus Controller Flags: medium devsel, IRQ 17 I/O ports at 0500 [size=32] 01:04.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10) Subsystem: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ Flags: bus master, medium devsel, latency 32, IRQ 18 I/O ports at de00 [size=256] Memory at fdeff000 (32-bit, non-prefetchable) [size=256] Capabilities: [50] Power Management version 2 01:06.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10) Subsystem: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ Flags: bus master, medium devsel, latency 32, IRQ 17 I/O ports at dc00 [size=256] Memory at fdefe000 (32-bit, non-prefetchable) [size=256] Capabilities: [50] Power Management version 2 01:07.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10) Subsystem: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ Flags: bus master, medium devsel, latency 32, IRQ 19 I/O ports at da00 [size=256] Memory at fdefd000 (32-bit, non-prefetchable) [size=256] Capabilities: [50] Power Management version 2 hdparm ouput: [root@server ~]# hdparm /dev/hdc /dev/hdc: multcount = 0 (off) IO_support = 0 (default 16-bit) unmaskirq = 0 (off) using_dma = 0 (off) keepsettings = 0 (off) readonly = 0 (off) readahead = 256 (on) geometry = 8146/16/63, sectors = 8211168, start = 0 [root@server ~]# hdparm -I /dev/hdc /dev/hdc: ATA device, with non-removable media Model Number: InnoDisk Corp. - iCF4000 4GB Serial Number: 20091023AACA70000753 Firmware Revision: 081107 Standards: Supported: 5 Likely used: 6 Configuration: Logical max current cylinders 8146 8146 heads 16 16 sectors/track 63 63 -- CHS current addressable sectors: 8211168 LBA user addressable sectors: 8211168 device size with M = 1024*1024: 4009 MBytes device size with M = 1000*1000: 4204 MBytes (4 GB) Capabilities: LBA, IORDY(can be disabled) Standby timer values: spec'd by Vendor R/W multiple sector transfer: Max = 2 Current = 2 DMA: mdma0 mdma1 mdma2 udma0 udma1 *udma2 udma3 udma4 Cycle time: min=120ns recommended=120ns PIO: pio0 pio1 pio2 pio3 pio4 Cycle time: no flow control=120ns IORDY flow control=120ns Commands/features: Enabled Supported: * Power Management feature set * WRITE_BUFFER command * READ_BUFFER command * NOP cmd * CFA feature set * Mandatory FLUSH_CACHE HW reset results: CBLID- above Vih Device num = 0 CFA power mode 1: enabled and required by some commands Maximum current = 100ma Checksum: correct

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• NTFS write speed really slow (<15MB/s) on Ubuntu

  - by Zulakis

  When copying large files or testing writespeed with dd, the max writespeed I can get is about 12-15MB/s on drives using the NTFS filesystem. I tested multiple drives (all connected using SATA) which all got writespeeds of 100MB/s+ on Windows or when formatted with ext4, so it's not an alignment or drive issue. top shows high cpu usage for the mount.ntfs process. AMD dual core processor (2.2 GHz) Kernel version: 3.5.0-23-generic Ubuntu 12.04 ntfs-3g version: both 2012.1.15AR.1 (Ubuntu default version) and 2013.1.13AR.2 How can I fix the writespeed?

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• Can SATA be used to connect computers?

  - by André

  Can SATA be used to connect two computers together, just like a crossover Ethernet cable would do ? I know SATA has no "networking" features and even though a controller may have multiple ports, the drives don't "see" each other, and that in SATA one device acts as the host (the computer) and the other device is some kind of "client" (the storage drive). But still, did anyone attempt to make a kernel module that would make one computer appear as a "client" (so that the host's SATA controller detects it as a standard hard drive) and then set up like a pseudo-Ethernet link or a very high speed serial link (and then run pppd on it and do networking) ? Note : I know this is an unprofessional and totally stupid idea, I'm just asking out of curiosity.

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• How can I reverse connect with vncconnect or vncconfig with ubuntu as the server?

  - by yan bellavance

  On a windows machine I am running: "listening VNC viewer" From a Ubuntu machine, I need to reverse connect to the windows machine but it does not seem to be working. I was able to make it work between 2 windows machines, but I need it to work with Ubuntu as the server as well. I tried vncconnect -display $DISPLAY 192.168.1.134:5500 and nothing happens. So instead I tried vncconfig but I get the message : "No VNC extension on display :0.0" Any ideas? If this is the wrong site just send me a comment I'll close the question.

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• connecting to bsnl wll, with huawei fixed wireless modem with connected to usb port on linux mint.

  - by Rakesh

  On windows, when I plugged in the usb connector, to the device was recognized as a mass storage device and installed all the drivers, to my computer, then the device, automatically restarted and started behaving like a modem, I'm writing this post, using the same modem, through windows... On linux mint (debian kernel, similar to ubuntu 8.10), the device is recognized as a mass storage device, some times, but, has no programs, useful for linux... When I use the modem on windows and restart the computer and login to linux, the device shows up as "not yet configured" in the terminal command "lsusb"... I googled a lot for solutions, tried many things, atlast, configured it and run the command "wvdial". But, get the error, that the modem is not responding, at last ! :'( Please help me out... Many more people are facing this problem, as I could discover, when I googled for it. this is the website address of huawei, the company of my modem... "www.huawei.com" Specification: model: ETS1220 FEQ: 800M Thank you.

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• Is Zscalar's HTTPS Everywhere for IE affiliated with EFF?

  - by noloader

  The Electronic Frontier Foundation has a tool called HTTPS Everywhere for Firefox, Chrome and Opera. But they don't list Internet Explorer. There is a company called Zscalar that provides HTTPS Everywhere for Internet Explorer. I can't determine if the EFF approves of Zscalar's IE extension, or if the company hijacked the EFF tool's name. The only mention of Zscalar on the EFF website is the HTTPS Everywhere Atlas. The closest I can find from Zscalar are link backs on the Zscalar website and a Zscalar PDF that points back to the EFF website. The EFF tool is free, open source and can be audited, but I don't see similar governance for Zscalar's tool. For example, I don't see mention of source code at HTTPS Everywhere for Internet Explorer. And it looks like there's a "Free Trial" for HTTPS Everywhere for Internet Explorer (see the link on the right). Is Zscalar's HTTPS Everywhere for IE affiliated with EFF?

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• MacBook not connecting anywhere via VPN

  - by Toby

  I was wondering if someone could help me troubleshoot this issue. I have a handful of VPNs set up on my MacBook (Snow Leopard) which I know are working, but today when I tried to use them I get the following error in all cases: could not find the PPP kernel extension I have not needed to use any VPN for a while but they have worked in the past and there is nothing I can think of that I have changed on this machine. I have looked in System/Library/Extensions and PPP.kext is there which is the file I thought it would be looking for? Any help would be greatly appreciated.

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• Can the Windows 8.1 update be applied without local terminal?

  - by Ben Voigt

  It is possible to access the Windows Store from a remote desktop session and initiate the Windows 8.1 Update from the Windows Store, but the update hangs after the first reboot, likely waiting for the user to accept the license check. This leaves the computer unusable remotely. Is there a way to pre-accept the license terms so that the update can complete autonomously? Perhaps an UNATTEND.XML such as would be used for an unattended clean install? Failing that, is there a way to connect with remote desktop during that phase of the install (it appears to be GUI-mode setup running with the usual Windows kernel and full OS)?

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• How to play an MKV 3D side-by-side video?

  - by djechelon

  I have a video in Matroska format (MKV, file extension .mkv), 3D half-SBS, where the 1280x720 frame shows the left-eye frame on the left and the right-eye frame on the right. I don't have a 3DTV, but I have NVidia 3D Vision: I tried to open it with PowerDVD 10 with no result (program hangs). With the same PowerDVD, I tried to play the Avatar 3D trailer downloaded from YouTube (MP4 format), but it now shows it the two frames. PowerDVD 10 is advertised to support 3D and 3D Vision. Why can't I play these videos? NVidia Stereoscopic player plays the Avatar trailer fine, but it doesn't support MKV.

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• excel cannot open the file xxx.xlsx' because the file format is not valid error

  - by Yavuz

  I have difficulty open opening word and excel files suddenly. Only particular office file give me the problem. These files were previously scanned by combo fix and I believe they were damaged. The error response that I from office is Excel cannot open the file xxx.xlsx because the file format is not valid. Verify that the file has not been corrupted and that the file extension matches the format of the file. This is for excel and a similar kind of error response comes for word. The file looks fine. I mean the size vise... Please help me with this problem. I really appreciate your help and time....

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• How can OpenGL graphics be displayed remotely using VNC?

  - by Jared Brown

  I am attempting to run a program that uses OpenGL to render a model in a viewport through VNC unsuccessfully. The error message I receive is - Xlib: extension "GLX" missing on display ":1.0". It was my understanding that VNC can be configured to render all graphics remotely and send a compressed screen grab from the display buffer to the local client. This would seem to negate the need for GLX extensions on the local client. Can VNC be configured this way and could you briefly describe how? Remote host: vncserver on RHEL 5 Local client: UltraVNC on Windows XP

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• My browsers won't use my full screen resolution, IE different

  - by curtis

  My screen resolution is actually 3200x1800, but when I'm in a browser it acts like I have a smaller resolution. How do I get my browsers to use my full resolution? On Chrome it's using 1280x720, and on IE it's using 1600x900. According to whatismyscreenresolution.com, which is showing different values for different browsers. I took a screenshot of them and verified that my resolution is 3200x1800 as that is the pixels in the bitmap. I'm on a laptop with no monitor plugged in. My zoom in both browsers is at 100%. I've tried zooming out below 100% but then the text is unreadable and pixellated. I've tried restarting. Windows 8.1. I've tried the chrome extension OptiZoom and it does nothing. document.body.clientWidth gives 1247, and I want it to give 3200.

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• Permanent Routes Centos Questions

  - by user65053

  So with a little help I figured out how to setup these routes and I can set them in rc.local route add -net 208.82.236.0 netmask 255.255.255.0 dev ppp0 metric 1 route add -net 208.82.236.0 netmask 255.255.255.0 dev eth0 metric 10 my question is being that the first route is ppp0 as soon as I disconnect the modem the route is dropped how do I maintain the route or make it permanent so that next time the modem connects it will follow the route. Currently after ppp0 disconnects the route is dropped netstat -r Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface laxapx03.o1.com * 255.255.255.255 UH 0 0 0 ppp0 208.82.236.0 * 255.255.255.0 U 0 0 0 eth0 10.0.1.0 * 255.255.255.0 U 0 0 0 eth0 169.254.0.0 * 255.255.0.0 U 0 0 0 eth0 default 10.0.1.1 0.0.0.0 UG 0 0 0 eth0

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• Increase text size in Ubuntu 10.04 due to having large resolution/monitors

  - by Sridhar Ratnakumar

  I have 24" dual monitors with 1920x1080 resolution on both of them. Consequently the text appears so small. I use the following text-intensive applications frequently: Web browser (Google Chrome) IDE (Komodo) Terminal (Gnome Terminal) Email (Thunderbird) I can configure text size on IDE, Terminal and Email. But for Chrome, it is not a good idea to set proportional font size because often one wants to see the entire (not just proportional fonts) site to be zoomed. So I am asking: Is it possible to increase DPI in Ubuntu (much like on Windows) so as to increase the text size across all apps? OR Is it possible to set permanent 'zoom' in Google Chrome, using a third-party extension maybe? I am using Ubuntu 10.04 (Lucid Lynx)

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• Fedora14 serial console how-to needed

  - by lamba2

  Has anyone ever got a serial console working in fedora 14 ? Is it as simple as adding to grub: serial --unit=0 --speed=38400 terminal --timeout=10 serial console and add to the kernel lines: console=tty0 console=ttyS0,38400 ??? If so, this isn't working for me. I have agetty installed, and im using minicom, although i've heard you can also use "screen /dev/ttyUSB0" on the client side. The /etc/init/serial.conf file suggests it should be working, but nothing. Currently getting no joy from any of this after 2 days. Does anyone know a method that definitely works on fedora 14 ? (no /etc/event.d/ needed or such) edit: Client side im using a null modem cable and usb-serial adaptor.

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• How to open embedded Visio files with only Visio Viewer?

  - by Christopher Galpin

  For some bizarre reason Visio Viewer seems incapable of opening vsd files when they're embedded within a (2010) Excel document: However if I open the Excel document with 7-zip, browse to xl\embeddings, extract oleObject1.bin and rename it to a .vsd file extension it opens perfectly fine with Visio Viewer in Internet Explorer. Since this opens fine on a computer with the full Visio installed, my guess is it's trying to launch Visio rather than IE. Is there something I can do to fix this? I've been scanning with Process Monitor and searching with RegScanner comparing a Visio-installed system to a VisioViewer-installed system and there doesn't actually seem to be any sort of registry value giving direction here... maybe it's just the nature of OLE. (If it can't be fixed I'm okay with converting the extracted one to a .png or so to replace the embedded object, but the "solutions" I've found for vsd to image conversion are very poor or non-working, i.e. buggy code, code with Visio dependencies, or online services.)

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• What would interfere with changing the default application for opening files on OS X?

  - by Michael Prescott

  I know how to change the default application for opening files. I select a file in Finder, right-click and select Get Info from the context menu. In the file's Info window, expand the Open with: panel. In that panel is a combo box that says, in my case, Adobe Flash CS4. I click the combo box and select Flash Player. It changes. Then I click the Change All... button. A dialog pops up and says: Are you sure you want to change all similar documents to open with the application “Adobe Flash CS4”? This change will apply to all documents with extension “.swf”. Cancel/Continue Well, clicking Continue does exactly what the message says. It sets the Finder to open all swf files with Adobe Flash CS4. What is going on? Why doesn't the message say, .... "Flash Player"

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• Differing packages between Ubuntu 9.04 and 9.10

  - by bergyman

  So I've been playing around with VirtualBox and both of the above Ubuntu versions and I've noticed that there are some differences between the available packages when doing a apt-cache search <package>. Some of these I'm sure are obvious, as they potentially only work on their respective systems. But I've noticed specifically several ruby packages differ. So my question is whether or not there's a way to get some of the ruby packages (ruby1.9.1-full for example) which only seem to be available on 9.10 (yup, I did a sudo apt-get update on both 9.10 and 9.04) on my 9.04 system? Is there a way I can just do a kernel upgrade on 9.04, or whatever else may be needed in order to get at these more recent packages?

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• HP Envy 14, Ubuntu 10.10 and trouble with the graphics cards

  - by Carsten Gehling

  A few days ago I bought a HP Envy 14, containing 2 graphics card: An integrated Intel graphics card, and an ATI HD 5650. I've installed Ubuntu 10.10 32-bit on the machine. Most things work fine out of the box, but the graphics cards are giving me trouble. When booting, I get the message "failed to get i915 symbols, graphics turbo disabled". Then the screen blanks out during the remaining boot period. I am able to get the display working by changing to one of the consoles, then closing and opening the laptop's lid. It seems that Ubuntu gets confused about which card to use. I've read here: http://www.andreas-demmer.de/en/2010/07/18/testbericht-linux-auf-dem-hp-envy-14 that I should be able to turn off one the cards by echoing keywords into /sys/kernel/debug/vgaswitcheroo/switch, but that path is not available on my system. The BIOS does not have any methods to switch of the ATI card. Help anyone? /Carsten

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• HP Envy 14, Ubuntu 10.10 and trouble with the graphics cards

  - by Carsten Gehling

  A few days ago I bought a HP Envy 14, containing 2 graphics card: An integrated Intel graphics card, and an ATI HD 5650. I've installed Ubuntu 10.10 32-bit on the machine. Most things work fine out of the box, but the graphics cards are giving me trouble. When booting, I get the message "failed to get i915 symbols, graphics turbo disabled". Then the screen blanks out during the remaining boot period. I am able to get the display working by changing to one of the consoles, then closing and opening the laptop's lid. It seems that Ubuntu gets confused about which card to use. I've read here: http://www.andreas-demmer.de/en/2010/07/18/testbericht-linux-auf-dem-hp-envy-14 that I should be able to turn off one the cards by echoing keywords into /sys/kernel/debug/vgaswitcheroo/switch, but that path is not available on my system. The BIOS does not have any methods to switch of the ATI card. Help anyone? /Carsten

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• Install PHP on RedHat

  - by John R

  I just ran yum install php in the command prompt. Everything went fine ('complete!') as per the dialogue. I then uploaded a file that does not use short tags and is named with the proper extension (i.e., the name is test.php). <?php print "hello world"; ?> When I navigate my browser to test.php it just prints each of the characters shown above; i.e., PHP is not interpreting it. What might be the problem? Also, if there is a configuration file that needs to be updated, please tell me what directory path I am likely to find that file. Edit: Apache2 & Redhat

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• How do I reinstall/enable snapper?

  - by Aaron Digulla

  I had errors in my root filesystem (btrfs) so I recreated it from a backup but now, snapper doesn't work anymore: # /usr/bin/snapper -v -v -v -v create --description test IO Error. # snapper -v delete-config Deleting config failed (deleting snapshot failed). # snapper create-config / Creating config failed (subvolume already covered). # snapper -c root create-config / Creating config failed (subvolume already covered). # snapper list Type | # | Pre # | Date | User | Cleanup | Description | Userdata -------+---+-------+------+------+---------+-------------+--------- single | 0 | | | root | | current | I also tries to reinstall/remove and install the package snapper but without any luck. Any ideas how I can make snapper work again? openSUSE 12.3 with kernel 3.7.10-1.1-desktop.

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• Server not sending a SYN/ACK packet in response to a SYN packet

  - by jeff

  Using iptraf, tcpdump and wireshark I can see a SYN packet coming in but only the ACK FLAG is set in reply packet. I'm running Debian 5 with kernel 2.6.36 I've turned off window_scaling and tcp_timestamps, tcp_tw_recycle and tcp_tw_reuse: cat /etc/sysctl.conf net.ipv4.tcp_tw_recycle = 0 net.ipv4.tcp_tw_reuse = 0 net.ipv4.tcp_window_scaling = 0 net.ipv4.tcp_timestamps = 0 I've attached an image of the wireshark output. http://imgur.com/pECG0.png Output to netstat netstat -natu | grep '72.23.130.104' tcp 0 0 97.107.134.212:18000 72.23.130.104:42905 SYN_RECV I've been doing everything possible to find a solution and have yet to figure out the problem, so any help/suggestions are much appreciated. UPDATE 1: I've set tcp_syncookies = 0 and noticed I am now replying with 1 SYN+ACK for every 50 SYN requests. The host trying to connect is sending a SYN request about once every second. PCAP FILE

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• How to download Firefox extensions from addons.mozilla.org without installing them?

  - by kjo

  Pages at the https://addons.mozilla.org/en-US/firefox site often feature buttons that say "Add to Firefox". Clicking on such a button causes a Firefox extension to be downloaded and installed. I am looking for a convenient way to limit this action to the download step only, so that in the end I am left with the downloaded *.xpi file in my disk. Thanks! P.S. The following approach is not only inconvenient: it doesn't work!. Inspect the HTML for the button, and extract a URL like https://addons.mozilla.org/firefox/downloads/latest/1234/addon-1234-latest.xpi?src=search give or take the stuff after .xpi. at the command-line prompt, download this URL with wget or curl. This download attempt just hangs. (Even if it didn't, I'd like to find a less cumbersome approach.)

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