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  • How To Monitor Home Wireless Network Connected Devices Bandwith

    - by GWLlosa
    (Originally posted on SuperUser, not sure if it might be better suited here) I have in my home a standard Comcast cable internet connection. I have it going from the wall to a cable modem, and from the modem to a late-series Linksys router, which provides wired and wireless networking. The vast majority of the users are wireless connections. For day-to-day tasks, this connection is fully sufficient for all my needs. However, on regular occassions, we have social gatherings that involve many people bringing laptops and other PCs and using the network and internet simultaneously, frequently for gaming. I have no administrative oversight over these machines; they have been known to be riddled with spyware and/or bloatware or be running torrents, legal or otherwise. The only reason I care is that on a regular basis, one of the machines will flatline my internet bandwith, and consume it all in order to upload/download/spam people/whatever. When this happens, the latency of the connections for gaming and the like becomes unacceptable, and everyone suffers. My question is: Is there a system I can set up whereby I can easily monitor the various systems connected to my wireless connection, see how much bandwith each one is using, and for what ends? That way, at a glance, I can spot the offending machine and kick it from the connection, without having to go from machine to machine, checking each one's "bandwith used" properties manually, and dealing with the owner's indignant protests all the while. I understand this will likely involve 3rd-party software and/or hardware; my issue is I don't even know where to begin.

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  • What does Firefox do when "scanning for viruses" after download?

    - by Joey
    Never mind the fact that Firefox is a browser and not a AV tool, but what exactly does it do after a download? Even on systems that have an up-to-date AV this generates a pause of several seconds after download (where I can't open the file from within the DL manager) and I have no idea what FF might be trying there. I know I can turn it off (using FF only at work anyway) but I'm wondering. I can think of some things here what it might be: FF itself is a AV scanner and it loads signatures in the background and whatnot. Sounds highly unlikely and shouldn't need tens of seconds for 20 KiB files. FF tries to talk with the installed AV to munch the file. Sounds unneeded, given that most AV programs feature real-time protection anyway and therefore will have caught a virus already and also because FF does that on systems without AV installed too. FF uploads the file to some online virus checker. Unlikely and stupid. FF instructs some online virus checker to download the file and check it. Unlikely and would be a nice target for DoSing that service. FF generates a hash of the file and sends that somewhere (presumably Google) to check for. They then respond with either "Whoa, that hash is totally a virus" or "Nope, that MD5 doesn't look very virus-y to me". I'm running out of better ideas. Anyone have a clue?

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  • Matching up HomeGroup users created in different versions of Windows

    - by pdr
    In our household, we have 2 laptops and a desktop, all currently on Windows 8.1. The desktop has been upgraded in stages from Windows 7. Laptop 1 was bought with Windows 8 and has now been upgraded. Laptop 2 is new and came with Windows 8.1. We've been trying to set up a HomeGroup such that we have one user on laptop 1, one on laptop 2 and both can log into the desktop, with each user able to edit their files on their laptop and desktop, while the other user has read-only access. And we now have that situation ... except ... because the user on laptop 1 was created in Windows 8 but the same user on the desktop was created in 8.1, they have different names in Windows Explorer (say, firstuser and first_000). Likewise, the other use was created on laptop 2 in Windows 8.1 and on the desktop in Windows 7 (so let's say secon_000 and seconduser). This is ultimately confusing. Now if we expand the HomeGroup, we get four users (firstuser, first_000, seconduser and secon_000) and each has a single computer inside it. What I'd like to see is firstuser = laptop1, desktop and seconduser = laptop2, desktop. An acceptable alternative is first_000 = laptop1, desktop and secon_000 = laptop2, desktop. But what I don't want to have to do is delete firstuser and seconduser and rebuild them. Is there a better way?

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  • How to set an executable white list?

    - by izabera
    Under Linux, is it possible to set a white-list of executables for a certain group of users? I need them to be unable to use, for example, make, gcc and executables on removable disks. How can this be done? Edit, let me explain better. I'm dealing with a high school IT system, young geeks that (during the lessons) want to play, surf the net, damage those computer however they can. The major step to achieve this goal was to remove the system they're familiar with and install Ubuntu in all the computers. This actually works quite well, but recent events proved that this is not enough. I want to allow them to execute certain safe programs, like Open Office, and to deny any other program, whether it is preinstalled software, something they carry in usb drives, a downloaded program or a script they program on site. It's possible to remove the 'x' permission on any file on the pc, but of course it would be impractical. Furthermore, they would be able to run anything they download. I thought the best solution would be to make a white-list of safe programs and to deny anything else, but I don't really know how to do it. Any idea is helpful.

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  • Any ideas why Ettercap filters aren't seeing packet data?

    - by Bryan
    I'm using an Ettercap filter to detect a query response coming back from a particular service on a remote machine. When I see a response from the service, I'm searching through the data in the packet to see if an offset is a specific value, and if so I'm changing the value at another offset. Trouble is, when I try this on a new virtual machine I built my Ettercap filter's no longer getting any data in the DATA.data variable available to it. if(ip.proto == TCP && tcp.src == 17867) { msg("Response seen!\n"); if(DATA.data + 2 == "\0x01") { msg("Flag detected!\n"); DATA.data + 5 = 0x09; } } The filter's getting applied to the traffic because "Response seen!" messages get printed out by Ettercap. However, "Flag detected!" messages do not. I think DATA.data is indeed empty because if I change my second "if" statement to check for DATA.data == "" then the "Flag detected!" message gets printed. Any ideas why this may be happening?! Also, if this is the wrong site to be asking questions like this, please let me know. I wasn't sure if it fit better here or somewhere like superuser or serverfault. By the way, this is a cross-post from StackOverflow... I should have posted on this forum instead I think. :)

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  • nginx codeigniter rewrite: Controller name conflicts with directory

    - by palerdot
    I'm trying out nginx and porting my existing apache configuration to nginx. I have managed to reroute the codeigniter url's successfully, but I'm having a problem with one particular controller whose name coincides with a directory in site root. I managed to make my codeigniter url's work as it did in Apache except that, I have a particular url say http://localhost/hello which coincides with a hello directory in site root. Apache had no problem with this. But nginx routes to this directory instead of the controller. My reroute structure is as follows http://host_name/incoming_url => http://host_name/index.php/incoming_url All the codeigniter files are in site root. My nginx configuration (relevant parts) location / { # First attempt to serve request as file, then # as directory, then fall back to index.html index index.php index.html index.htm; try_files $uri $uri/ /index.php/$request_uri; #apache rewrite rule conversion if (!-e $request_filename){ rewrite ^(.*)/?$ /index.php?/$1 last; } # Uncomment to enable naxsi on this location # include /etc/nginx/naxsi.rules } location ~ \.php.*$ { fastcgi_split_path_info ^(.+\.php)(/.+)$; # NOTE: You should have "cgi.fix_pathinfo = 0;" in php.ini # With php5-cgi alone: fastcgi_pass 127.0.0.1:9000; # With php5-fpm: #fastcgi_pass unix:/var/run/php5-fpm.sock; fastcgi_index index.php; include fastcgi_params; } I'm new to nginx and I need help in figuring out this directory conflict with the Controller name. I figured this configuration from various sources in the web, and any better way of writing my configuration is greatly appreciated.

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  • Outdoor WiFi Mesh Topology vs. Repeaters

    - by IronJaxor
    Here's the current configuration in our organization (which I believe is incorrect): We have a number of Cisco 1500 series AP's (22 in total), that are mounted outdoors to provide seamless WiFi coverage over a large area. Each AP however has its own physical ethernet connection back to the WLC (All the AP's are marked as Root AP's). They are all broadcasting the same SSID. We have tried to stagger the channel selection but because there are only three non-overlapping channels to choose from, and in some areas the density of AP's is quite high, there is multiple places of channel interference. With this configuration we experience 100-150 disconnects from clients every day. (Our clients are mobile so they move throughout the coverage area constantly). My idea is to switch the AP's to the same channel thereby forming a wireless mesh, use the built in functionality of the 1500 series to use 802.11a as the backhaul, designate one or two AP's as root AP's and wire them back to the WLC. Thereby forming a WiFi mesh, which if I'm not mistaken is the point of the 1500 series in the first place! I am however completely new at WiFi networks and wondering if I am simply mistaken in what I believe my proposed changes will enable, or if there is a better way to tackle the WiFi topology.

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  • MongoDB and GrifFS. What are the best storage options in the range of 1 TB?

    - by Nerian
    We are going to launch a service that will require between 1 and 2 GB for file storage per paid user. I am going to use GridFS for storing files. I am pondering the different options for storing the database. But since I am unexperienced at deployment and it is my first time with Mongodb I need your experience. Criteria: I want to spend my time developing my core business, that is, my own application. I am a Ruby on Rails developer. I do not like to mess with server configuration. Hence, I would like a fully managed hosting solution. But I would like to know about any other option, if you think it is worth it. It should be able to scale. Cloud style. Pay as you go. The lower the price, the better. So far I known of these services: https://mongohq.com/pricing https://mongomachine.com/pricing https://mongolab.com/about/pricing/ http://cloudcontrol.com/add-ons/mongodb/ And they seem to be OK for common needs, that is no file storage. But I am going to use GridFS, so the size matters. These services seems to scale, in price, quite poorly. MongoHQ: The larger plan max storage is 20 GB. Seems like a very little storage, for GridFS. MongoMachine: Flat price, 2.5$ per GB. I didn't found the limit. Seems like a good price, comparing the others. MongoLab: 3.984 GB max, which I don't think I will hit, so perfect. 8$ per GB, quite costly. CloudControl: The larger plan is 20 Gb. The custom service starts at 250€ plus some unspecified charge per GB. What is your experience with these services? Any downtimes? Other possibilities?

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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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  • Recovering corrupted VB.NET Form file?

    - by Omega
    Good day. This question is directly related to this one I made here: http://stackoverflow.com/questions/4911099/there-is-no-editor-available-for-form1-vb-error There, I was working on my VB.NET 2010 Express application, I saved, then a blackout came and now, apparently, I can't view the designer nor code of my Form file (Form1.vb). On StackOverflow, I was recommended to check for the From1.vb file, and try to open it on Notepad. If nothing appeared, it would mean that my file was corrupted. I open it on Notepad, and I get a blank file. It is 27kb, but it only has blank spaces. So I assume it is corrupted. I was told this place was better for dealing with corrupted files, about techniques to recover them. I use Windows7, VB.NET 2010 Express. I run Windows7 on Parallels Desktop, Mac OS X. However, I do not believe that is the problem, most likely it was that damned blackout... this is the first time that happens to me. VB.NET worked just fine for me all time (about a month and half). Thank you.

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  • Dns - wildcard vs. cname subdomains

    - by Matthew
    Alright I have to admit I'm confused with how DNS works. I've always just added things until they worked, and now it's time to learn how they work. So one confusing thing to me is that there's sort of two places I can have records. I have an account with rackspace cloud servers. And then there's the place I registered the domain. But both allow me to edit DNS records. Should I do everything at both places or is one better than the other or am I missing the point? Subdomains confuse me too. I'd like to be able to just have a wildcard subdomain (I've done this in the past.) I just don't like the idea of adding a cname record or A record every time I need a new subdomain. Then I read this and it says: The exact rules for when a wild card will match are specified in RFC 1034, but the rules are neither intuitive nor clearly specified. This has resulted in incompatible implementations and unexpected results when they are used.

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  • Are these three brand new sticks of RAM really dead?

    - by David Brown
    I'm working on a Dell Dimension 4700 desktop for a friend. It came with 512MB of DDR2 RAM (two sticks of 256MB). One morning, it started blue screening on startup with no helpful error messages. It refused to boot into any form of Windows installation, including Safe Mode, original recovery disk, and my custom Windows PE disk. It did boot into the Ultimate Boot CD, so I ran memtest86, which reported errors everywhere. I removed one stick of RAM and the system booted up just fine. I moved the remaining stick into each slot and the system continued to operate normally, so I came to the conclusion that the stick that I removed was dead. I ordered an exact replacement, along with 2 more sticks of 256MB DDR2 (again, exactly the same as the original), bringing the total system memory to 1GB. Upon installing the three brand new sticks, the system blue screened again, this time stating that win32k.sys attempted to write to read-only memory. I inserted my custom Windows PE disk in order to get a better look at the memory dump with BlueScreenView, but it refused to boot and produced another blue screen, but without an error message. I removed each new stick one-by-one, restarting each time. It continued to blue screen until I was left with only the original stick. I then tried inserting the new sticks in various different orders, but this only produced more blue screens. I reinserted all three sticks (along with the original) and ran memtest86 again, which reported errors all over the place. So, now I'm right back where I started. I don't think it could be the slots themselves, because I can plug the original stick into any slot and it works just fine. System setup reports each stick correctly and shows the total as 1GB, however. It just seems strange to me that all three brand new sticks of RAM could be dead on arrival. Is there something I missed? Or should I just go ahead and RMA them?

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  • Is it possible to get ESC to behave as an actual escape key?

    - by leftaroundabout
    So I have finally switched, not so much because I'm yet convinced Emacs in itself is the better editor but because it certainly does have more powerful extensions. I am still using vim-mode though, perhaps that's part of my problem... but I really don't intend to abandon the modes-approach, so I'll probably stay with it. I'm getting along quite well, but one thing I find really unnerving is the behaviour of the esc key (which I have in the shift-lock position). I'm used to relying on this a lot as more or less a "panic key", which may not be nice but I find allows me to work generally quite a bit less caring about the keystrokes themselves, and thus faster. What I'd like this key to do is just get me out of any minibuffer or special editing mode into a well-defined normal state. Perhaps most importantly, I would like it to not do anything unrelated, Simulate meta. What do I have an alt key for? Close windows I'm not even in at the time. Getting interpreted as the final key in some key sequence. ... Is it possible to turn all that off and make esc an actual escape key? Vim-mode does make it behave kind of as I like in some situations, but when other plugins are involves this often breaks. Alternatively, are there different options that might suit my kind of workflow?

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  • Looking for advice on using dd to backup a dual boot laptop.

    - by AvatarOfChronos
    My questions boils down to this. If I do "dd if=/dev/sda of=usbdrive" can anybody confirm that this will get everything including mbr/partition information/all four partitions and create a drive that I can swap with the failing internal drive without losing anything? If this is done while the computer is running will it still copy everything? At this point I'm afraid to shutdown the computer for fear of it never starting again. Secondly, how tolerant is dd of failing drives? Has anybody used it to recover a half dead drive before that can share any potential pitfalls? Did it get the data ok or is this going to be a hope for the best kind of situation? And lastly, If the usbdrive is larger than the failing internal drive I'll still be able to expand the partitions later so I'm not losing space? this last part seems silly to ask but with my current streak of bad luck I'll end up overwriting some magic bit and forever turning a 640gb hdd into a 500gb hdd. Also if anybody has a better solution to create a complete clone that gets everything I'm all for hearing about it. PostScript: I had been making periodic backups however when whatever miasma that killed the laptop struck it also got the NAS :( Post PostScript: both devices were on a UPS system.

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  • How to handle OpenVPN client as a service, when the laptop is physically on the network already?

    - by James
    The Setup I've gotten OpenVPN working on our Windows XP laptops. Users are limited, so I went ahead and set OpenVPN client to run as a service, which is great anyway because that means they are on the VPN before logging in, so login scripts work, plus we can do remote support even if the user can not log in (such as connecting via VNC or resetting passwords). It is also configured to send all traffic over the tunnel, so when, for example, they browse the internet it is just like browsing from our corporate network. The Qestion(s) So, I'm wondering how does the OpenVPN client act when the computer is already physically on the same network as the OpenVPN server? Right now, the client is configured to connect the the public dns name which will resolve to the public ip address which will NOT get reflected back to the OpenVPN server, so it is affectively blocked from connecting to the OpenVPN server while on the network. Is that a good thing? Or will it constantly try to connect, using up system resources and network resources? We will likely have hundreds of laptops regularly on the physical network with this, so it could contribute to a lot of unnecessary network chatter. Alternatively Would it be better to have the firewall reflect the port back to the OpenVPN server and let it connect? Or have our internal dns resolve the name to the private ip and allow them to connect directly? Would traffic then go over the vpn connection (which I do not want, when already on the physical network)? Or is it possible to tell it to ignore the connection when the client and server are already on the same network? TLDR What's a sane way of handling OpenVPN client running as an always-on service when the client and server will often be on the same network?

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  • Using Truecrypt to secure mySQL database, any pitfalls?

    - by Saul
    The objective is to secure my database data from server theft, i.e. the server is at a business office location with normal premises lock and burglar alarm, but because the data is personal healthcare data I want to ensure that if the server was stolen the data would be unavailable as encrypted. I'm exploring installing mySQL on a mounted Truecrypt encrypted volume. It all works fine, and when I power off, or just cruelly pull the plug the encrypted drive disappears. This seems a load easier than encrypting data to the database, and I understand that if there is a security hole in the web app , or a user gets physical access to a plugged in server the data is compromised, but as a sanity check , is there any good reason not to do this? @James I'm thinking in a theft scenario, its not going to be powered down nicely and so is likely to crash any DB transactions running. But then if someone steals the server I'm going to need to rely on my off site backup anyway. @tomjedrz, its kind of all sensitive, individual personal and address details linked to medical referrals/records. Would be as bad in our field as losing credit card data, but means that almost everything in the database would need encryption... so figured better to run the whole DB in an encrypted partition. If encrypt data in the tables there's got to be a key somewhere on the server I'm presuming, which seems more of a risk if the box walks. At the moment the app is configured to drop a dump of data (weekly full and then deltas only hourly using rdiff) into a directory also on the Truecrypt disk. I have an off site box running WS_FTP Pro scheduled to connect by FTPs and synch down the backup, again into a Truecrypt mounted partition.

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  • 150 TB and growing, but how to grow?

    - by seandavi
    My group currently has two largish storage servers, both NAS running debian linux. The first is an all-in-one 24-disk (SATA) server that is several years old. We have two hardware RAIDS set up on it with LVM over those. The second server is 64 disks divided over 4 enclosures, each a hardware RAID 6, connected via external SAS. We use XFS with LVM over that to create 100TB useable storage. All of this works pretty well, but we are outgrowing these systems. Having build two such servers and still growing, we want to build something that allows us more flexibility in terms of future growth, backup options, that behaves better under disk failure (checking the larger filesystem can take a day or more), and can stand up in a heavily concurrent environment (think small computer cluster). We do not have system administration support, so we administer all of this ourselves (we are a genomics lab). So, what we seek is a relatively low-cost, acceptable performance storage solution that will allow future growth and flexible configuration (think ZFS with different pools having different operating characteristics). We are probably outside the realm of a single NAS. We have been thinking about a combination of ZFS (on openindiana, for example) or btrfs per server with glusterfs running on top of that if we do it ourselves. What we are weighing that against is simply biting the bullet and investing in Isilon or 3Par storage solutions. Any suggestions or experiences are appreciated.

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  • How to safely send newsletters on VPS (SMTP) w/ non-hosted domain as "From" email?

    - by Andy M
    Greetings, I'm trying to understand the safest way to use SMTP. I'm considering purchasing a second virtual server mainly for email sending, on which I will set up PHPlist (a free open-source mailing program), so we have the freedom to send unlimited newsletters (...well, 10,000 per day at least, which requires a VPS rather than shared hosting). Here's my current setup with a paid mass-mailing software: I have a website - let's call it MyHostedDomain.org. I send newsletters with the From / Reply To address as [email protected], which isn't being hosting by me but I have access to the email account. Can I more or less safely set this up with an SMTP server on a VPS? i.e. send messages using [email protected] as the visible address, but having it all go through my VPS SMTP? I cannot authenticate it, right? Is this too risky a practice? Is my only hope to use an address with a domain on the VPS, i.e. [email protected]? I already have a Reverse DNS record for the domain hosted on my current VPS. I also see other suggestions, like SenderID and DKIM. But with all these things combined, will this still work? I don't want to get blacklisted, but the good thing is this is a somewhat private list, and users opt-in to subscribe. So it's a self-made audience. (If it makes you feel better, this is related to a non-profit activity, not some marketing scam...it's for a good cause, I assure you!)

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  • Active Directory FRS problems. 13508 error and other problems

    - by user59232
    I have 3 Domain Controllers. We will call them DC1, DC2 and DC3. DC3 and DC2 show Event ID 13508 in their FRS logs with no follow-up event(13509 I think) to say the error had been fixed. DC1's FRS log no matter what you do never shows any events besides FRS service stopped and started. DC1 holds the SYSVOL that needs to be replicated to the other DC's. The other DC's sysvol folders are empty. I have tried the burflag method of fixing this but I haven't had any luck. My procedure for that was to stop all FRS services on all DC's. Then set the burflag on DC1 to D4 and the other two DCs burflag to D2. Started FRS on DC1 and the only event's I see in DC1's FRS event logs are service stopped and service started messages. This fact is leading me to believe that something is wrong on FRS for DC1. I believe there should be events 13553 and 13516 in the FRS event logs after an authoritative sysvol restore. The other two DC's do not have anything in their SYSVOL, otherwise I would have made one of them the authoritative sysvol. DC1 is MS Server 2003 Enterprise Edition SP2 DC2 is MS Server 2003 Standard Edition SP1 DC3 is MS Server 2003 R2 Standard Edition SP2 I did not setup this domain originally but I am now the administrator of it, so I don't have a lot of background on why certain things may have been done in the past. My main goal is to try and fix these issues to get myself better prepared to decommision DC1 and add a DC running Server 2008 to my domain. Thanks.

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  • iptables: How to combine DNAT and SNAT to use a secondary IP address?

    - by Que_273
    There are lots of questions on here about iptables DNAT/SNAT setups but I haven't found one that solves my current problem. I have services bound to the IP address of eth0 (e.g. 192.168.0.20) and I also have a IP address on eth0:0 (192.168.0.40) which is shared with another server. Only one server is active, so this alias interface comes and goes depending on which server is active. In order to get traffic accepted by the service a DNAT rule is used to change the destination IP. iptables -t nat -A PREROUTING -d 192.168.0.40 -p udp --dport 7100 -j DNAT --to-destination 192.168.0.20 I also wish all outbound traffic from this service to appear to come from the shared IP, so that return responses will work in the event of a active-standby failover. iptables -t nat -A POSTROUTING -p udp --sport 7100 -j SNAT --to-source 192.168.0.40 My problem is that the SNAT rule is not always run. Inbound traffic causes a connection tracking entry like this. [root]# conntrack -L -p udp udp 17 170 src=192.168.0.185 dst=192.168.0.40 sport=7100 dport=7100 src=192.168.0.20 dst=192.168.0.185 sport=7100 dport=7100 [ASSURED] mark=0 secmark=0 use=2 which means the POSTROUTING chain is not run and outbound traffic leaves with the real IP address as the source. I am thinking I can set up a NOTRACK rule in the raw table to prevent conntracking for this port number, but is there a better or more efficient way to make this work? Edit - Alternative question: Is there a way (in CentOS/Linux) to have an interface that can be bound to but not used, such that it can be attached to the network or detached when a shared IP address is swapped between servers?

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  • Figuring out which PC part is faulty

    - by Davy8
    I have an odd scenario and I'm having trouble figuring out which is the faulty component. First of all, the video doesn't work, monitor says it's not getting a signal. Monitor's not faulty (works on other computer) so the first suspect was video card. However 2 things make me think it's not the video card. (Don't have another machine with PCIe around to test definitively) First, the GPU fan is spinning so it's getting power. Second, tried putting in an older PCI video card that is known to be working (pulled out of another working machine) and there's still no video. Normally if it's not the video card I'd suspect the motherboard, but everything's getting power on the mobo, so I'm not sure. The case apparently doesn't have system speakers, so can't hear any of the diagnostic beeps either. Also not sure whether a faulty CPU would cause no image at all either. The parts are brand new so something's going to get RMA'd but I'm not sure which component is to blame in this case. (Only slightly related, but I also accidentally put too much thermal paste on the CPU. The fan/heatsink instructions said to put the whole tube which seemed like a lot compared to previous experience, and as I started squeezing I knew it was definitely too much and stopped at about 1/3 but against my better judgement I didn't wipe any off. I'm not sure whether that would cause problems other than not cooling as effectively as it should)

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  • Nginx: Loopback connection via PHP's getimage size crashes server (Magento's CMS)

    - by Alex
    We were able to trace down a problem that is crashing our NGINX server running Magento until the following point: Background info: Magento Backend has a CMS function with a WYSIWYG editor. This editor loads some pictures via a controller in magento (cms/directive). When we set the NGINX error_log level to info, we get the following lines (line break inserted for better readability): 2012/10/22 18:05:40 [info] 14105#0: *1 client closed prematurely connection, so upstream connection is closed too while sending request to upstream, client: XXXXXXXXX, server: test.local, request: "GET index.php/admin/cms_wysiwyg/directive/___directive/BASEENCODEDIMAGEURL,,/ HTTP/1.1", upstream: "fastcgi://127.0.0.1:9024", host: "test.local" When checking the code in the debugger, the following call does never return (in ´Varien_Image_Adapter_Abstract::getMimeType()` # $this->_fileName is http://test.local/skin/adminhtml/base/default/images/demo-image-not-existing.gif` # $_SERVER['REQUEST_URI'] = http://test.local/admin/cms_wysiwyg/directive/___directive/BASEENCODEDIMAGEURL list($this->_imageSrcWidth, $this->_imageSrcHeight, $this->_fileType, ) = getimagesize($this->_fileName); The filename requests is an URL to the same server which is requesting the script a link to a static .gif that is not existing. Sample URL: http://test.local/skin/adminhtml/base/default/images/demo-image-not-existing.gif When the above line executed, any subsequent request to the NGNIX server does not respond any more. After waiting for around 10 minutes, the NGINX server starts answering requests again. I tried to reproduce the error with a simple test script that only calls getimagesize() with the given URL - but this not crash. It simple leads to an exception saying that the URL could not be loaded (which is fine as the URL is wrong)

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  • Finding the current user authenticated by basic auth (Apache)

    - by jtd
    When you log in through a basic auth page, is the username you authenticated as stored anywhere (on the server or client machine), maybe in an environment variable? Background: I have a common web administration page for an e-mail server and I'd like to know who is doing what. When a user successfully logs in via basic auth, I somehow want to be able to identify them and log their actions. So each time a request is submitted, I can write to a log file. The basic format would be: $username ran a $function against $useraccount so if a user changed someone's permissions, eg: Admin-Bob ran a permission change against User-Scott So if errors occur, I can easily trace back in the log file what actions lead to the cause. I tried checking the %ENV hash to no avail, any Ideas? I don't really want to get into PHP-like sessions, because that would mean scrapping my basic auth, which gives me a fine degree of control already. If I have to code something with sessions, I'd need to implement a system to block users after maximum tries and so on, which I don't really want to code. I think this is better geared towards serverfault because it pertains to Apache moreso than the programming language. Sessions can be done in a myriad of languages.

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  • Why do I have redundant routing in Windows 7?

    - by Mark
    I'm trying to better understand my routing tables. My routing table is: IPv4 Route Table =========================================================================== Active Routes: Network Destination Netmask Gateway Interface Metric 1. 0.0.0.0 0.0.0.0 192.168.1.1 192.168.1.151 25 2. 127.0.0.0 255.0.0.0 On-link 127.0.0.1 306 3. 127.0.0.1 255.255.255.255 On-link 127.0.0.1 306 4. 127.255.255.255 255.255.255.255 On-link 127.0.0.1 306 5. 192.168.1.0 255.255.255.0 On-link 192.168.1.151 281 6. 192.168.1.151 255.255.255.255 On-link 192.168.1.151 281 7. 192.168.1.255 255.255.255.255 On-link 192.168.1.151 281 8. 224.0.0.0 240.0.0.0 On-link 127.0.0.1 306 9. 224.0.0.0 240.0.0.0 On-link 192.168.1.151 281 10. 255.255.255.255 255.255.255.255 On-link 127.0.0.1 306 11. 255.255.255.255 255.255.255.255 On-link 192.168.1.151 281 =========================================================================== Most of those entries make sense to me, but a few confuse me: 2 and 3 seem redundant, as do 2 and 4. Why not just 2? 5 and 6 seem redundant, as do 5 and 7. Why not just 5? I'm trying to grok routing tables and this bit is still confusing me.

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  • How do I automatically connect my client to an ODBC data source on another machine with dynamic IP?

    - by Kdansky
    At the customer's place, we've got a postgres DB on a server, and a few clients. We connect them through ODBC-drivers, and all machines run windows (usually XP). Now we had a few annoying issues: The client "forgets" some flags in the ODBC drivers, such as ByteA as LO. Every time anything changes, we have to reset that, and type in the password, and sometimes even the IP of the server. On x64 machines running Windows 7, configuring this is a pain as the system settings dialogue will only show 64-bit connections by default. And most importantly: If the server changes IP because the customer restarts or replaces a switch, all connections are lost. Annoyingly, this cannot be fixed with just correcting the IP, but rather, we have to check every single place (even hba_conf) because all the settings magically disappear. Our customers often are very small companies, where "server" means "that one PC in the other room", and not "Oracle mainframe in the dungeon", so we don't want to rely on them not restarting switches. Is there a better way than to rely on these really unstable settings? Are these settings somewhere in a file which I could edit manually, to make fixing it easier?

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