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• Firefox won't start

  - by Daniel R Hicks

  OK, I've got this problem again, only this time the problem only seems to affect Firefox and Thunderbird. Rebooted several times. Tried resetting to the last restore point, but that didn't work. Tried setting a new Firefox profile, and that didn't work either. The symptom is that you click on the Firefox or Thunderbird icon, the process appears in the Process Explorer list, but the window never opens. Curiously, if Firefox has been "started" this way, Internet Explorer hangs starting until I kill the Firefox process. Any ideas? I suppose the next thing to try is uninstalling and reinstalling Firefox/Thunderbird, but this whole thing is getting old. The box is a Sony Vaio running Windows Vista. It was completely restored from scratch less than two weeks ago, after the last fiasco. (I'm suspecting that my aborted install of Acronis True Image may have mucked things up this time.) Sigh! Another symptom: It occurred to me to try printing something, but if I open "Printers" it just sits there "searching". So something is rotten in the bowels of Windows. Minor update: It occurred to me to kill Internet Explorer (where I'd attempted printing). Then Printers comes up fairly quickly -- with no printers defined. Clicking "Add a printer" does nothing. Update: Well, following this suggestion to stop and restart the print spooler brought the printers back. And, wonder of wonders, Firefox now starts OK. Stopping and restarting the print spooler!!

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• KVM virtual machine unable to access internet

  - by peachykeen

  I have KVM set up to run a virtual machine (Windows Home Server 2011 acting as a build agent) on a dedicated server (CentOS 6.3). Recently, I ran updates on the host, and the virtual machine is now unable to connect to the internet. The virtual network is running through NAT, the host has an interface (eth0:0) set up with a static IP (virt-manager shows the network and its IP correctly), and all connections to that IP should be sent to the guest. The host and guest can ping one another, but the guest cannot ping anything above the host, nor can I ping the guest from anywhere else (I can ping the host). Results from the guest to another server under my control and from an external system to the guest both return "Destination port unreachable". Running tcpdump on the host and destination shows the host replying to the ping, but the destination never sees it (it doesn't even look like the host is bothering to send it on at all, which leads me to suspect iptables). The ping output matches that, listing replies from 192.168.100.1. The guest can resolve DNS, however, which I find rather odd. The guest's network settings (connection TCP/IPv4 properties) are set up with a static local IP (192.168.100.128), mask of 255.255.255.0, and gateway and DNS at 192.168.100.1. When originally setting up the vm/net, I had set up some iptables rules to enable bridging, but after my hosting company complained about the bridge, I set up a new virtual net using NAT and believe I removed all the rules. The VM's network was working perfectly fine for the last few months, until yesterday. I haven't heard anything from the hosting company, didn't change anything on the guest, so as far as I know, nothing else has changed (unfortunately the list of packages updated has since fallen off scrollback and I didn't note it down).

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• Wireless Access Point stopped working

  - by Alex Pritchard

  I have a simple LAN set up at home using a Linksys WRT54GSV4 as my primary router and an Encore ENHWI-2AN3 as an access point. I connect the Encore to the Linksys by running a cable from one of the Linksys LAN ports into the Encore WAN input. I originally configured this using the Encore setup wizard, setting the device up in AP Router Mode. It detected the input network and worked about as expected, creating a second network that used my primary network to connect to the internet. It worked fine for about 2 weeks, then abruptly cut out today. I checked to make sure the network was still live through the cable going into the Encore (provides internet when connected to a laptop directly) and that devices are still able to connect to the network being broadcast by the Encore. When I try to rerun the connection wizard on the Encore, I receive the message "No Services found in WAN port." The WAN Settings is no longer retrieving a dynamic ip from the line. I tried providing a static IP, assigning an IP address within the subnet range of my primary router that wasn't being used and pointing the Default Gateway to the Linksys IP, but this did not work either. When I plug the cable into the WAN port, an internet light comes on that is not lit when a live network is not connected. I've tried doing a hard reset on the Encore (held down the rest button until the lights flashed, reconfigured from scratch), but the WAN settings are still not detected. Also tried powering off and on the modem, linksys, and encore. Any suggestions would be appreciated!

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• Some of my keys are automatically being pressed along with other keys

  - by Santosh

  History The last time when my computer shutdown was a power failure. Now some keys are automatically being pressed when I type something. The last thing I did to keyboard setting was adding a keyboard layout (on Ubuntu). What is happening Whenever I press c, xc is writeen s gives me sd d gives me sd e gives me we 2 gives me 23, So when I want @ it gives me @# 3 gives me 23 Pressing CAPS Lock gives me F3 and vice-versa. All other key are either working fine or I don't use them. I have two operating system Ubuntu and Windows, I use Windows very less and found this problem on Ubuntu, but as soon as I logged in to Windows (for checking) then I found that Windows has the same problem. Effects on my life This starts form the time of login, even I have problem in typing my password. Whenever I try to save any webpage, it is bookmarked automatically. Whenever I copy, it is cut automatically. I have to spend more than half of time correcting what I have typed. Note: Typing thisd quwesdtion wasd rweally a big pain to mwe.

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• disk partition centos

  - by FlourishDNA

  I am setting up server for hosting two WordPress which has size of around 70GB. I have already installed CentOS as OS and I would like to partition the Disk. Is there any tool which can help me or can someone guide me though the process as I am not expert is SSH commands. Here are some output that might help. OS: CentOS release 6.3 fdisk -l Disk /dev/xvdb: 214.7 GB, 214748364800 bytes 255 heads, 63 sectors/track, 26108 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000b91e0 Device Boot Start End Blocks Id System Disk /dev/xvda: 21.5 GB, 21474836480 bytes 255 heads, 63 sectors/track, 2610 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000e542c Device Boot Start End Blocks Id System /dev/xvda1 * 1 64 512000 83 Linux Partition 1 does not end on cylinder boundary. /dev/xvda2 64 2611 20458496 8e Linux LVM Disk /dev/mapper/vg_flourish-lv_root: 16.7 GB, 16718495744 bytes 255 heads, 63 sectors/track, 2032 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Disk /dev/mapper/vg_flourish-lv_swap: 4227 MB, 4227858432 bytes 255 heads, 63 sectors/track, 514 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 df Filesystem 1K-blocks Used Available Use% Mounted on /dev/mapper/vg_flourish-lv_root 16070076 758184 14495560 5% / tmpfs 958500 0 958500 0% /dev/shm /dev/xvda1 495844 31926 438318 7% /boot df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_flourish-lv_root 16G 741M 14G 5% / tmpfs 937M 0 937M 0% /dev/shm /dev/xvda1 485M 32M 429M 7% /boot Thanks

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• VMWare vSphere 5: 4 pNICs for iSCSI vs. 2 pNICs

  - by gravyface

  New SAN for me, never used before: it's an IBM DS3512, dual controller with a quad 1GbE NIC per controller that a client bought and needs help setting up. Hosts (x2) have 8 pNICs and while I usually reserve 2 pNICs for iSCSI per host (and 2 for VM, 2 for management, 2 for vMotion, staggered across adapters), these extra ports on the SAN have me wondering if storage I/O would be significantly improved with 2 additional NICs per host, or if the limitations of the vmkernel/initiator would prevent the additional multipaths from ever being realized. I'm not seeing alot of 4 pNIC iSCSI implementations per host; 2 is the de facto standard from what I've read/seen online. I could and probably will do some I/O testing, but just wondering if there's a "wall" that someone else has discovered long ago (i.e. before 10GbE) that makes a 4 NIC iSCSI per host setup somewhat pointless. Just to clarify: I'm not looking for a how-to, but an explanation (link to paper, VMWare recommendation, benchmark, etc.) as to why 2-NIC configurations are the norm vs. 4-NIC iSCSI configurations. i.e. storage vendor limitations, VMKernel/initiator limitations, etc.

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• Can Haproxy deny a request by IP if its stick-table is full?

  - by bantic

  In my haproxy configs I'm setting a stick-table of size 5 that stores every incoming IP address (for 1 minute), and it is set as nopurge so new entries won't get stored in the table. What I'd like to have happen is that they would get denied, but that isn't happening. The stick-table line is: stick-table type ip size 5 expire 1m nopurge store gpc0 And the whole configs are: global maxconn 30000 ulimit-n 65536 log 127.0.0.1 local0 log 127.0.0.1 local1 debug stats socket /var/run/haproxy.stat mode 600 level operator defaults mode http timeout connect 5000ms timeout client 50000ms timeout server 50000ms backend fragile_backend tcp-request content track-sc2 src stick-table type ip size 5 expire 1m nopurge store gpc0 server fragile_backend1 A.B.C.D:80 frontend http_proxy bind *:80 mode http option forwardfor default_backend fragile_backend I have confirmed (connecting to haproxy's stats using socat readline /var/run/haproxy.stat) that the stick-table fills up with 5 IP addresses, but then every request after that from a new IP just goes straight through -- it isn't added to the stick-table, nothing is removed from the stick-table, and the request is not denied. What I'd like to do is deny the request if the stick-table is full. Is this possible? I'm using haproxy 1.5.

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• How do I enable Ubuntu Gnome system tools

  - by RussellW

  I am running Ubuntu 10 with Gnome 2.30.2. This is a VMWare workstation image provided by another company that I do not have support in this regard. I am trying to access the graphical tools for configuring the network, users, and services but the System-Administration menu does not have these options listed. The main issue I am trying to solve is to correct the problems with the gnome menu options and network settings I have the gnome-system-tools package installed, and I am unable to run command-line versions of the tools, such as nm-applet (I get no GUI if I run that command, the process is running in the background). I realize that I can perform many tasks command-line, but I would like to use the GUI for administrative functions as I am not overly proficient for all command for restarting services and setting a static IP with a specific gateway. Further, I can run gnome-nettool, but I cannot change the IP, I can only see my network card. nm-connection-editor does not show any network cards that I can configure to change the IP. Currently, I am getting a DHCP through my NAT in VMWare, I want to set it to a specific IP address though. Preferences Menu (note some missing options) ![Preferences Menu][1] Admin Menu (note some missing options) ![Admin Menu][2] Network Tools (I can view but not change IP address) ![Network Tools][3] Network Settings (Unable to change IP address) ![Network Settings][4] Network Connections (no connections listed, not even my existing ethernet NAT connection through VMWare) ![Network Connections][5] See images here that I have referenced: 1- http://i.imgur.com/kl8pP.png 2- http://i.imgur.com/K3Cjz.png 3- Iq7Xb.png 4- 7wheV.png 5- J2ad8.png

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• Western Digital My Book not recognized by WD software

  - by Kari

  A few years ago I bought a WD My Book Pro 2. It worked fine for a while, then one of the drives failed and I sent it back to be replaced under warranty. I never got around to setting up the new one when I got it back. I finally ran out of room on my internal drive, so I tried to use the external - no go. Both drives spin up, but aren't recognized by either Disk Utility (Mac) or the WD Drive Manager. I tried on a PC as well with fresh software. Then I pulled the drives out of the enclosure (warranty is already expired) and plugged them straight into the PC. Both recognized and working 100% in RAID0. BIOS recognizes either disk as functional; Windows only sees them when both are connected due to the RAID which I can't change without the WD software. The drives that were returned to me are the "Green" drives which I've read are NOT recommended for RAID. Is it possible that this is interfering with them reading externally? Any other ideas? My main computer is a laptop so using them internally isn't an option :(

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• Setup ejabberd with SQL Server 2008

  - by wonster

  Here's what I have got so far. Windows 2008 Server 64 bit. Installed the latest version of ejabberd, ejabberd-2.1.8-windows-installer.exe. The windows service starts up fine but seems ineffective. However, using the start & stop scripts work. I am able to login to the admin page which so far doesn't seem that versatile. Opened up ports 5222, 5226 and 5280 for my workstation to talk to the server. I've got Spark and Jabbear Windows clients to register, login and instant message with multiple accounts using the server. After confirming that I've got the very basics working, I've decided to make use of SQL Server 2008 as the database. Reason? Mainly, I am very comfortable with SQL Server. I can deal with redundancy, failover, data analysis easily. Not sure if ejabberd's built in DB provides all that. Following the instructions from ejabberd's documentation, I setup a system DSN that points to another physical database. The DSN checks out fine. (Tried both Named Pipes and TCP/IP) Modified ejabberd.cfg. Commented line %%{auth_method, internal} and uncommented line {auth_method, odbc} Uncommented and modified {odbc_server, "DSN=ejabberd;UID=somelogin;PWD=somepassword"}. After making these changes, I restarted. No errors are found in the log files. The jabber clients are no longer able to register new accounts. I'm not sure where to look for errors besides the /logs/ folder as I'm new to all this. I am basically stuck here on step 5. Has anyone got this setup to work recently? Some of the posts I've found around are years old and of no help. I can't be the only one setting up ejabberd with MS SQL. Any help would be appreciated!

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• CD Drive not discovered

  - by user1009073

  I have a self built computer. it uses a P6T Deluxe motherboard, which has both SATA and IDE ports. This was built several years ago, and had an IDE CD/DVD drive. This drive started going bad (would not burn CDs correctly), so I decided to replace it. I had difficultly finding an IDE DVD drive, so I bought a SATA DVD drive. I opened the comnputer, took out the old DVD drive. I left the IDE cable in place, connected to the motherboard, but it is not connected to any drives. I hooked up the new DVD drive, both power and with a SATA data cable (SATA port 3 if I recall). (Sony Optiarc 24x , Newegg URL: http://www.newegg.com/Product/Product.aspx?Item=N82E16827118067 ) When I power on my computer, the drive does NOT show up in Explorer. I can hit the DVD eject button, and the drive will open up, so I know it at least is getting power. I thought, maybe something in the BIOS. When I go to BIOS, boot devices, it shows (1) floppy, (2) my hard drive (3) ATAPI CD Drive. The only other possible BIOS option I could find was uder 'Storage Configuration'. Configure Storage as: My setting is RAID, since I am using two drives in a RAID configuration. Other options were IDE and ACHI. Other than trying to find an IDE DVD drive, is there anything else I can try? The drive does not show up at all in Windows Explorer. I did put in a CD thinking that might help, but nothing happened. Thanks, GS

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• Nagios DNX plugins

  - by danneh3826

  I'm toying with the idea of multiple Nagios instances setup to monitor our infrastructure. I've looked at all the various methods of distributed Nagios checks, and I think DNX comes out the closest. DNX handles failure of worker nodes, that's fine. What happens if the main DNX server fails though? Is there a way to replicate the server too? I'm using AWS EC2 primarily, so I can utilise Elastic Load Balancing for the web UI, but I need to be able to handle the AZ where the monitoring server is to fail over, and essentially for a second to pick up the checking load (active/passive, active/active, so long as it doesn't fail completely) The other thing I'm trying to solve is an issue with routing. What I'd like is to have multiple nodes report a fault before Nagios confirms it as critical. Not the NRPE checks, as they're pretty self explanitory, but things more like check_ping. I often have routing issues out of AWS to certain datacenters, so Nagios can often report bad/no ping/timeout as a critical issue, even though the machine in question is working fine. Would it be possible to have a setup where a worker complains a service check is critical, and have a second worker node (positioned in another datacenter/AZ) also report the service as critical before the Nagios central server issues a critical alert? I realise I might be asking a bit much (how far down the line do you go setting up failover systems before it starts to get ridiculous), however surely someone must have thought of this scenario when developing DNX?

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• Is there any way to synchronize AD users with Office 365 but still be able to edit them online?

  - by Massimo

  I'm performing a migration to Office 365 from a third-party mail server (MDaemon); the local Active Directory doesn't include any Exchange server, and never had any. We will need directory synchronization in order to enable users to log on to Office 365 using their domain credentials; but it seems that as soon as you enable directory synchronization, you can't perform any action anymore on Office 365 users: all changes need to be made on the local Active Directory, and then replicated by the synchronization process. For ordinary users with a single e-mail address and standard features, this is not a big problem; but what about users which need an additional address? What if I need to configure some nonstandard setting, like "hide from address list" or a custom mailbox quota? From what I've gathered, the only supported way to do this, as you can't directly edit Office 365 objects anymore after synchronization is enabled, is to extend the local AD schema with Exchange attributes, and then manually edit them (!). Or, you can install at least one local Exchange server, and then use the Exchange administrative tools to configure the required settings. Is this correct or am I missing something? Is there any way to synchronize user accounts and password, but still be able to edit user settings directly in Office 365? If not (everything really needs to be set locally and then synchronized), is there any simpler way to do this than manually editing LDAP attributes or installing a local Exchange server?

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• Games consoles won't connect through the TP-Link TL-WA500G Access Point

  - by Manfred Wolff

  I hope that someone can help me. I have several Laptops and other devices, all using my Wireless Router (Sky Digital Netgear) To extend the range to the back of the house, I purchased a TP-Link TL-WA500G Range extender. configured just as a pure repeater, it picks up the signal from the Netgear Router. The Netgear Router does the DHCP, handing out the IP addresses. This all works a treat with several different laptops and my iPone4S, but when my son tries to use his XBox360, Sony Playstation3 or the Nintendo Wii those devices fail to acquire an IP address. They just sit their waiting for the IP config. This also happens with my wife's HTC desire ONE Android phone. My son says that, when his HTC Desire C won't get an IP address, he just unplugs the AP briefly - the phone will connect and he puts the AP back on. Once he is connected to the Router, the AP won't disturb function. The Games Consoles don't seem to work like that. They stop working, when the AP is reconnected. I had my son try to configure permanent IP addresses, and he said that did not work either, though I have to confirm that, as I did not see that for myself. Has anybody seen this before? I have searched the Net and have not found any similar problems anywhere. I wonder if there is setting somewhere that would fix this. Many thanks for anyone reading this and trying to help. M

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• Are ZFS snapshots + S3 a viable backup system for several VMs and general fileserver storage?

  - by AllanA

  I've been tasked with setting up a backup system for my small office (around 12 people). Most of our production stuff is on the AWS cloud, so what I need to back up are some small office/development files (under 100G right now), plus our operational VMs and development, which round out to a bit under 1T. I just need something reliable, convenient, and straightforward. I'm comfortable with Linux, FreeBSD, and to some extent Solaris 10, so I'm leaning toward a full server rather than an appliance system ala Openfiler or FreeNAS. What I'm contemplating is a small fileserver for general storage and nightly backups of the virtual machines, followed up by an offsite backup to Amazon's S3 storage service. It'd be the usual incremental backups nightly and full backup weekly. My question is if using ZFS snapshots, both locally and dumped to S3 via 'zfs send [-i]', is a viable backup tool? Or should I stick to using Duplicity, or some other method entirely? ZFS snapshots on the internal fileserver/backup machine sound like a perfect way to provide quick and convenient data recovery, so I'm likely to go with that for local redundancy. (If you folks see scenarios where relying on ZFS snapshots would be worse than a more traditional archiving backup, feel free to convince me.) But are snapshots flexible enough to lean on for recovery from the loss of my backup server? Or am I better off with something more traditional? (feel free to recommend free or commercial backup solutions you favor.)

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• Platform to allow users to suggest and vote for ideas

  - by Simon

  I head up a support team for a software product. I am in the process of setting up a blog (Wordpress.org), a forum (PHPBB or maybe Vanilla), a means to view bugs (probably expose Jira), but would also like to allow our customers to suggest enhancement requests. Currently we have this as a 'contact form' via the blog, which feeds into a dedicated inbox, which the product manager reviews and may include some of these ideas into the product. However, I would like to give the clients more power/visibility over this. Have a look at ideas.arcgis.com. There are plenty of other similar sites as well. Users can suggest new ideas Other users can vote these ideas up or down (similar to Stack Exchange sites) Ideas that are voted highly will be given a higher priority over lower ones. We can report back on the # of ideas we implement, and potentially reject ideas with reasoning. Has anyone seen any platforms (ideally free) which would replicate something similar to this? I was half thinking of embedding Vanilla within a wordpress page, but need to look into it more.

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• Looking for easiest, most simple solution to run a customised DNS Server for my local network on Windows 7.

  - by Jamie G

  I need to forward some websites, such as http://testing.server/ to an fixed IP address on my local network. I can do this easily on one computer using the hosts file. However, I need this to work for all machines on my network. I think the best way to do this will be to setup my own DNS Servers and add the custom DNS settings there. However, I'm looking for the simplest way possible to do this - I really don't want to spend hours setting up Unix Servers and running tricky terminal based scripts just to do this! My server is a standard Windows 7 machine. My dream would be a nice simple windows program with a GUI where I could input my ISP's DNS server and it would use those records, unless I had specifically set up my own DNS for a domain to use instead. If it had a web based admin system that was accessible from another computer on the network that would be even better. Does anyone know of anything that can do this? Many thanks indeed.

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• UIDs for service users in Mac OS X

  - by LaC

  Some third-party servers should be run under a special user for security reasons (eg, PostgreSQL is typically run by "postgres"). Of course, these service users should not show up in the Mac OS X login windows. I know how to create hidden users using dscl or dsimport, but I'm wondering what the best policy is for assigning UIDs (and matching GIDs). Apple's documentation states that UIDs from 0 to 100 are reserved (pg. 69), but OS X comes with several special users and groups outside that range. I used to use ids from 401 onwards for services, but I noticed that OS X 10.6 has started using that range for groups created by the Sharing pane in System Preferences. What is the recommended ID range to use for third-party services, then? Perhaps I should just use IDs in the 500 range, since all that is needed to hide a user in Snow Leopard is setting his password to "*"? Also, most of Apple's services have names starting with an underscore, with an alias sans underscore; eg, _sandbox and sandbox. Is there any special significance to this? Should I do the same for my services?

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• openvpn in a bridge?

  - by sebelk

  I have a somewhat tricky proble to solve. We have a wireless link between 2 building. One of them has an mikrotik and below there are some vlans. Some machines of one vlan need to use openvpn to connect to a remote private lan. I put a TP-Link WR1043ND (which those machines connect to) with openwrt with ebtables just in case I need it. I've configured openwrt in such a way that all ports belongs to the same vlan. My idea was to make things as transparent as I can. It has a bridge as follows: usr/sbin/brctl-full show br-lan bridge name bridge id STP enabled interfaces br-lan 8000.f8d111565716 no eth0.1 eth0.2 Also I've added an ebtables rule: ebtables -t broute -A BROUTING -p ipv4 -j DROP So "bridge" has only one IP address. I've installed openvpn and I'm trying to bring up the tunnel but I can't still get working. Sure, someone can says why don't you use the vpn on the mikrotik, there are some reasons, the first one is I have little experience with mikrotik and I'd want to have the vpn at hand :) The problem is that openvpn is not working, because it is complaining that I have only one Ip Address on the server side. So I set up and alias interface with another IP address but is not working either: : Rejected connection attempt from IP-Client-Side:37801 due to --remote setting Is there a way to make it work?

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• umask seems to vary by user

  - by paullb

  I've got a development Ubuntu system for which I have several users: myself (with full sudo) and about 5 other users. (I've set up the system so everything in this respect is still at its default setting) I'm trying to set the system up so that multiple people can collaborate in a single directory by using grouing and I want the default permissions to be 664. However when some users edit files the permissions were 644. After a lot of investigating most users have a umask (checked at the prompt) of 0002 and when they create files they are 664 (as expected) but there are 2 (myself and one other) who have 0022 umask (so the files that come out are 644 and nobody else can write to them). I've looked everywhere but can't figure out why a couple users wind up with a different umask e.g. there is nothing the .bash_profile or anything like that) Any ideas for the source of the discrepancy? /etc/bashrc if [ $UID -gt 199 ] && [ "`id -gn`" = "`id -un`" ]; then umask 002 else umask 022 fi /etc/profile if [ $UID -gt 199 ] && [ "`id -gn`" = "`id -un`" ]; then umask 002 else umask 022 fi EDIT: My (bad) ~/.bashrc # .bashrc # Source global definitions if [ -f /etc/bashrc ]; then . /etc/bashrc fi # User specific aliases and functions export LANG=en_US.utf8 Other user (good) .bashrc # .bashrc # Source global definitions if [ -f /etc/bashrc ]; then . /etc/bashrc fi # User specific aliases and functions

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• Why is this iptables rule that does port forwarding not working?

  - by videoguy

  I have a server bound to localhost:7060. It is using ipv6 socket instead of ipv4. Below is netstat outout. # netstat -an Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 10.200.32.98:1720 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:4122 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:4123 0.0.0.0:* LISTEN tcp 0 0 127.0.0.1:4123 127.0.0.1:43051 ESTABLISHED tcp 0 0 10.200.32.98:5555 10.200.32.44:53162 ESTABLISHED tcp6 0 0 :::5060 :::* LISTEN tcp6 0 0 ::ffff:127.0.0.1:7060 :::* LISTEN tcp6 0 0 :::23 :::* LISTEN tcp6 0 0 ::ffff:10.200.32.98:23 ::ffff:10.200.32.142:43505 ESTABLISHED tcp6 0 0 ::ffff:127.0.0.1:43051 ::ffff:127.0.0.1:4123 ESTABLISHED tcp6 0 0 ::ffff:10.200.32.98:23 ::ffff:10.200.32.44:53195 ESTABLISHED udp6 0 0 :::5060 :::* CLOSE # I want to setup a port forwarding rule that accepts connections on port 24 (on all interfaces loopback as well as eth0) and forward the data to localhost:7060. This is how I am setting up the iptables rule: iptables -t nat -A PREROUTING -p tcp --dport 24 -j DNAT --to 127.0.0.1:7060** It is not working. When I telnet from different box, I see the following $telnet 10.200.32.98 24 Trying 10.200.32.98... If I change the server to bind to *:7060 and set the following rule, it seems to work fine. iptables -t nat -A PREROUTING -p tcp --dport 24 -j REDIRECT --to-port 7060 But that will make my server available on WAN interface which I don't like. I feel it had something to do with ipv6 socket (tcp6 line in netstat output). This whole thing is done on an Android device with custom built Android platform image. How do I get this working?

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• How do I tell Windows to use 802.11 in preference to 3G?

  - by Jon Skeet

  I have a Samsung NC-10 netbook which I take to work every day. Most of the time I use it just on the train/bus, but I also use it at work and home. It has a built-in 3G card which I want to use when travelling, but I'd prefer to use wifi when I'm at work or home, for obvious reasons. Unfortunately, if the 3G connection is up, Windows appears to use that in preference to wifi. Starting up and shutting down the 3G modem is a bit of a pain - it's not hard as such, just a bit inconvenient. Ideally I'd like it to always be up, and even have the connection itself up all the time, but without routing traffic through it if there's a wifi connection up. This is what my Android phone does, for example. Is there somewhere in Windows which lets me express an ordering for network interfaces? I suspect the routing table may be relevant, but it's a bit of a pain to mess around with. I'd really expect there to be a simple GUI way of setting this up - after all, it would equally be useful when dealing with wired vs wifi connections. I'm currently using Windows XP Home, but Windows 7 answers would also be useful as I'll be migrating soon.

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• Playback random section from multiple videos changing every 5 minutes

  - by brian

  I'm setting up the A/V for a holiday party this weekend and have an idea that I'm not sure how to implement. I have a bunch of Christmas movies (Christmas Vacation, A Christmas Story, It's a Wonderful Life, etc.) that I'd like to have running continuously at the party. The setup is a MacBook connected to a projector. I want this to be a background ambiance thing so it's going to be running silently. Since all of the movies are in the +1 hour range, instead of just playing them all through from beginning to end, I'd like to show small samples randomly and continuously. Ideally the way it would work is that every five minutes it would choose a random 5-minute sample from a random movie in the playlist/directory and display it. Once that clip is over, it should choose another clip and do some sort of fade/wipe to the chosen clip. I'm not sure where to start on this, beginning with what player I should use. Can VLC do something like this? MPlayer? If there's a player with an extensive scripting language (support for rand(), video length discovery, random video access). If so, I will probably be able to RTFM and get it working; it's just that I don't have time to backtrack from dead-ends so I'd like to start off on the right track. Any suggestions?

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• No network connection for vmware esxi guests

  - by JavaDev

  I'm new to VMware and setting up an Esxi server as a trial with the intention of possibly virtualizing some of our servers in the near future. I have setup ESXi on a Dell poweredge server, and installed a Centos 5.6 and Ubuntu 11.04 guest os on the server. However I cannot get networking on my guest OS's. The host is connected to a network with a DHCP server via a switch and is configured with a static IP. I have the default set-up for networking on the host: both guests are connected to the default vmnic1 adapter via the virtual switch vSwitch0. One thing though, the virtual adapter shows 'Observed IP ranges' to be XXX.XXX.XXX.194-XXX.XXX.XXX.195 (I've blanked out the initial prefixes) i.e just 1 address, even though the network the host is connected to has the usual 255.255.255.0 subnet mask. On the guest machines (using DHCP) by default, I can see an eth0 interface but with no connection or assigned IP address. A physical machine connected to the network gets a DHCP lease as expected. How do I get networking working on my guest OSes? Apologies for the long-winded question.

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• How large is the performance loss for a 64-bit VirtualBox guest running on a 32-bit host?

  - by IllvilJa

  I have a 64-bit Virtualbox guest running Gentoo Linux (amd64) and it is currently hosted on a 32-bit Gentoo laptop. I've noticed that the performance of the VM is very slow compared to the performance of the 32-bit host itself. Also when I compare with another 32-bit Linux VM running on the same host, performance is significantly less on the 64-bit VM. I know that running a 64-bit VM on a 32-bit host does incur some performance penalties for the VM, but does anyone have any deeper knowledge of how large a penalty one might expect in this scenario, roughly speaking? Is a 10% slowdown something to expect, or should it be a slowdown in the 90% range (running at 1/10 the normal speed)? Or to phrase it in another way: would it be reasonable to expect that the performance improvement for the 64-bit VM increases so much that it is worth reinstalling the host machine to run 64-bit Gentoo instead? I'm currently seriously considering that upgrade, but am curious about other peoples experience of the current scenario. I am aware that the host OS will require more RAM when running in 64-bit, but that's OK for me. Also, I do know that one usually don't run a 64-bit VM on a 32-bit server (I'm surprised I even got the VM started in the first place) but things turned out that way when I tried to future proof the VM I was setting up and decided to make it 64-bit anyway.

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