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  • What router hardware or software should be used when multiple public IPs are routed into the same LAN?

    - by lcbrevard
    I am looking for recommendations to replace a set of consumer grade (Linksys, Netgear, Belkin) routers with something that can handle more traffic while routing more than one static public IP into the same LAN address space. We have a block of static public IPs, 5 usable, with Comcast Business. Currently four of them are in use for: General office access Web server Mail and DNS servers Download and backup web server for separate business All systems (a mixture of physical and virtual) are in the same LAN address space (10.x.y.0/24) to enable easy access between them inside the office. There are 30 or more systems in use depending on which virtual machines are currently active. We have a mixture of Windows, Linux, FreeBSD, and Solaris. Currently a separate consumer grade router is used for each of the four static addresses, with its WAN address set to the specific static address and a different gateway address for each: uses 10.x.y.1 - various ports are forwarded to various LAN IPs on systems with gateway 10.x.y.1 uses 10.x.y.254 - port 80 is forwarded to a server with gateway 10.x.y.254 uses 10.x.y.253 - ports for mail and dns are forwarded to a server with gateway 10.x.y.253 uses 10.x.y.252 - ports as needed are forwarded to server with gateway 10.x.y.252 Only router 1. is allowed to serve DHCP and address reservation based on the MAC is used for most of the internal "server" IP addresses so they are at fixed values. [Some are set static due to limitations in the address reservation capabilities of router 1.] And, yes, this really does work! But... I am looking for: better DHCP with more capable address reservation higher capacity so I don't have to periodically power cycle the routers One obvious improvement would be to have a real DHCP server and not use a consumer grade router for that purpose. I am torn between buying a "professional" router such as Cisco or Juniper or Sonic Wall verus learning to configure some spare hardware to perform this function. The price goes up extremely rapidly with capabilities for commercial routers! Worse, some routers require licensing based on the number of clients - a disaster in our environment with so many virtual machines. Sorry for such a long posting but I am getting tired of having to power cycle routers and deal with shifting IP addresses afterwards!

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  • GPU Temperature comparisons between similar GPUs of the same line

    - by White Phoenix
    As a general rule of thumb, if there are two similar GPUs from the same line (i.e. an NVIDIA GTX 260 vs a NVIDIA GTX 280), will the less powerful or more powerful GPU run hotter? This is assuming all other factors stay the same - hardware configuration, cooling setup, ingame settings, etc. Or does this depend entirely upon the GPU itself? I do remember reading that the GTX 280 in this example was terribly inefficient with power and cooling.

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  • How to prevent WD MyBook Live Duo from going to sleep?

    - by Chris Pietschmann
    I have an issue of my WD MyBook Live Duo going into some kind of low power standby mode when it hasn't been accessed for awhile. When I try accessing the drive it takes a minute or two to become responsive. When this happens Windows Explorer says the drive is unavailable. If I'm accessing the drive regularly throughout the day then this issue doesn't occur. Does anyone know of a way to make the drive more readily accessible on demand?

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  • Is the following combination of components valid to function as a desktop computer? [closed]

    - by Gideon Potgieter
    Could someone with more PC building experience than me tell me whether these PC components can cooperate fully as a self-made PC? Processor: Intel Core i5-3570K Video card: Asus Radeon HD 7870 Motherboard: Gigabyte GA-Z77-D3H RAM: Corsair CMZ16GX3M2A1600C10 Vengeance 16GB 1600MHz CL10 DDR3 (x2) Storage: Western Digital WD1002FAEX (x2) Display: Samsung S24B300HL Sound: Logitech X140 Chassis: Thermaltake V4 Black Edition VM30001W2Z Power supply: Seagate OEM 500W Builder PSU Optical drive: Asus DRW-24B1ST Thanks in advance! (btw, I know 32 GB RAM is unnecessary, but I want to buy it to use as a reserve)

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  • Configuring EC2 Instance

    - by Philip Isaacs
    Forgive me if this seems like a dumb question, but I'm wondering how do I increase the processing power (cpu, memory) of an instance I already have running. Right now I have a web server running on a m1.small type instance and it's performing poorly at peak times, is it possible to increase the amount of memory on the instance somehow, or do I need to create a new EC2 install. What are my options. Please advise.

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  • Will resetting the computer account in AD(2003) break the shares?

    - by Thoreau
    Had a power outage last night, still cleaning up from that. I have a file server that doesn't know it's part of the domain (getting the error: windows cannot connect to the domain either because the domain controller is down). I read that "resetting" the machine account the bring it back into the domain will do the trick. Since this is the file server for the entire office, I would like to be sure that I won't bork the umpteen number of shares on this server. Thanks!

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  • Cooling Server Rack with Water? Sensible? Reuse energy for small installation?

    - by TomTom
    First - this is not a shopping question, this is not so much about concrete prices but about general feasibility. Makes no sense to get looking fo ra manufacturer it the approach is bad. I am moving my company to new Offices in September, and among them we will expand and consolidate our number crunch cluster. It is so far in a data center. I have a nice room in the basement prepared now. I think about cooling. We will likely run up a power usage of around 10kw by end of the year. That is a LOT of stuff, and cooling will be expensive. I am located in south Poland, close to the German border. This is an area where water is available for relatively cheap price - "wasting water" is not a concern here. My situation is thus a lot different for example than in Spain ;) Physics tells me that to heat 1 liter of water by 1 degree I use 1 Calorie (1KCal), and a kwh power is (and we can assume 100% efficiency - water heaters are pretty efficient) 750 Calories. That means that 1 KWH is 750 liter by 1 degree. 10kw and a 20 degree heat would mean that per hour I need 375 liters. That is 6.25 liters per minute and not WHAT much ;) We talk 270 cubic meters here. Even in summer, the significant underground pipes really cool down the water a LOT more ;) Question: This such an approach feasible? Anyone done that? We talk of a 10kw installation for now. Is it feasible to reuse that heat? The alternative is a decent cooling system that WILL use around 2.5kwh for running. Dropping the water would basically (a) get me a quite cold input compared to the outside air even in summer (I.e. a lower temperature medium to drop the heat in) and (b) replace the need to actually have the outside cooling (which may b problematic - if the air is 22 degree, that is a LOT to fight off, but OTOH the water will be quite cold). I also would possibly save the investment for the outside part of the cooling circuit. Now, second question - is there a feasible way to heat a house with that? ;) After all, brutally speaking, it is a LOT of energy in that water ;) If it is a bad idea, I stop here - if it is not, I start looking for suppliers. Maybe my math is wrong?

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  • My PC fails to boot up

    - by hppavillion
    My HP Pavillion entertainment PC dv2000 does not boot up. When I press the power button it turns and reads the CD and all the lights turn up, but does not go into boot mode. What should I do? How do I troubleshoot a PC that won't even boot.

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  • How can virtualization be efficient?

    - by pestaa
    As I understand, the virtual machine and the guest OS doubles the amount of abstraction layers (that are computationally relevant) between the user interface and the pure power of the hardware. Some of the said abstraction layers are (emulated) hardware, drivers, IO interfaces, etc. Top-notch virtualization solutions like Xen probably eliminate a few of these complexities, but I still wonder how efficiency is achieved in these environments; and whether manageable cloud servers are really worth the performance price.

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  • Is there a way to shut off a laptop monitor?

    - by Corey Sarnia
    I tend to leave Skype calls on overnight, and for some reason Skype overrides my computer going idle. I have no idea why this is; it prevents Pidgin from idling, as well as some other programs, and prevents my computer from going into power-saving turning off the monitor. Anyway, is there a way to manually turn the monitor off on a laptop in Windows 7?

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  • How to get hibernate working on Windows 8?

    - by A T
    I have been using Windows 8 x64 Developers Preview as my primary OS on my laptop. Unfortunately I have been unable to enable hibernate (tried through registry and through powercfg.cpl). The closest I have got is that I was able to enable hibernate on pressing of power button, but that just turns of screen and keeps everything else running, I have to force shutdown to do anything. Do you know how I can get hibernate to work on my Dell Studio 17?

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  • Need suggestions for a Sigle Board Linux Computer?

    - by Joernsn
    I need suggestions for a single board computer, with these requirements: Runs linux Wifi (I/O module?) Does not need much computing power. I'm using it for applications like twittering when the coffee at the office is ready etc. I'd like it to run linux, for easy scripting and a full network stack. (preferably pre-installed)

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  • Utilizing 5 physical servers in 1 cluster

    - by Vijay Gharge
    Hi, I have 5 physical servers with low end memory & cpu resources. I want to create 1 cluster using all these servers and want to run mysql db on the same such that mysql db would utilize 5 server's CPU power to execute db queries & same for memory. Could you please help me understanding how to achieve this? Regards,

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  • USB Ports not working on new ASUS Z87 PRO motherboard

    - by Peter Coulton
    3 of the six USB ports on the back on my new ASUS Z87 PRO motherboard are not functioning properly. They do seem to deliver power, just don't seem to function for data (devices attached in these ports are detected by windows, or usable in UEFI) I think I'm right in saying that the top 4 ports (3 of which aren't working) run off an additional USB controller (not from the Z87 chipset) if that makes any difference. I'm pretty sure that I'll just have to return it, but any advice on diagnosing the problem would be welcome.

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  • SQL Server on VMWare - is transaction log corruption possible?

    - by demp
    Scenario: SQL Server 2005 or 2008, Windows 2008 OS. Running in a VM hosted on VMWare ESX server. Is there any known issue with VMWare when it caches pass-through write request and it never reaches the disk, while SQL Server "thinks" that write actually happened? This may lead to transaction log corruption in case of power failure or VM reboot. Just overheard the conversation but couldn't find it in relation to ESX.

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  • HP server delayed boot

    - by jjrab
    I'm currently using HP Proliant DL120 G5 servers running VMWare ESXi 4 to run server VM's. They are connecting to an iSCSI SAN for the shared storage. I'd like to implement a delayed boot of these hosts servers so that they don't boot up and try to connect to the SAN before the SAN is ready for connections after a power failure. Does anyone know of a good way to do this?

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  • How can I make a Windows 7 allow me to edit a data file?

    - by Ruvi
    Hi! I am running a Windows 7 operating system. I would like to edit a data file named "hosts" that is found in the following library: c:\windows\system32\drivers\etc\hosts The OS does not allow changes, and I do not know how to acquire administrator's power to be able to make the change. In addition, which program can edit such a file (a built-in text editor or an external one)?

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  • Autopower on (Lenovo R400)

    - by Mark
    I have a Lenovo R400, Every time I shut it down, it restarts itself after a second. It is completely off and after a couple of seconds it automatically power on itself What is wrong with it? Is it a Bios problem?

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  • How do I restore a Dell Inspiron 1521 laptop to facotry defaults

    - by Solignis
    I got a Dell Inspiron 1521 laptop from the local computer store, it is obviously a used machine. When I got it the data from the previous user was on it they did not do a wipe. Anyhow Dell was not being any help to me on wiping the data. Does anyone know how I get the machine to restore Windows to the factory settings. Also I do not have the system disc that come with the computer, I just have the computer and the power cord.

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  • How can I login (send text) with minicom?

    - by Travis
    I am attempting to login from a Linux client to a set top box running Linux via a USB to serial cable. When I power on the device, I can see the init messages scroll past, and I get to the login prompt, like this: (none) login: but I cannot login. The cursor stops flashing as if it is receiving input, but there is no response. My serial port setup is: Device: /dev/ttyUSB0 Bps: 115200 8N1 Hardware Flow Control: Yes Software Flow Control: No Any help would be greatly appreciated!

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  • How to remove hiberfil.sys

    - by Chadworthington
    I have a small SSD and I want to reclain the space currently used by the hiberfil.sys (~4GB) by disabling hybernation or perhaps preferably, move it to an HDD. I see under "power Options" that "Sleep/Hibernate After" is set to "Never", yet I have this 4 GB hiberfil.sys file. I don't see any other options pertaining to Hybernation. how do I remove this file and keep it from coming back or relocate it to another drive, an HDD where I would not mind the frivelous writes to take place.

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  • I have a collection of dead consumer grade routers, should I buy a real one?

    - by Ex Networking Guy
    Am I crazy for considering purchasing a Cisco 2621 for the house? I am familiar enough with IOS to set up a simple gateway router, I don't really need the experience. At this point, I'm a developer so my days of crawling through CO's and under desks are long past me. But I am really sick of crappy consumer grade networking gear. Maybe I have lousy luck and this stack of WRTG54s is just because I have lousy power, or whatever.

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  • How to run your own cloud network at home?

    - by Xeoncross
    I have 7 PC's around the house that total more than 10Ghz in CPU power. I was wondering if I could put them to use building my own "cloud computing" network to help with rendering videos, blender animations, Photoshop effects, or anything else. Does something like this exists - and if so what is it called and where do I find it?

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