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• My computer gets hosted when using 3G

  - by WeaklyTyped

  I recently activated 3G(UMTS) connection on my cellular network. I use Nokia S60 phone as a modem while connecting from Scientific Linux 6. While I am able to access net pretty well, the problem is my computer gets hosted. By using ip-address in a web-browser, anyone can access my localhost (running apache), this never happens with my wireline (ADSL) connection. Furthermore, even the Shell prompt changes from: [mach2@localhost ~]$ to [[email protected] ~]$ where XX.XX.XX.XX is the IP of the 3G connection. The very thought of putting my machine 'in the wild' is disconcerting. How can I rectify the situation without disabling services like apache, sshd and others?

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• Seeing DNS changes takes too long on my PC, can it be my router misconfiguration?

  - by Borek

  I administer a few sites and need to update their DNS entries from time to time, e.g., adding an A-record point certain subdomain to a certain IP. When I check sites like http://www.opendns.com/support/cache/, I can clearly see the DNS change taking effect throughout the world - is it just my PC that can't see this change (ping newsubdomain.example.org says it cannot resolve host name) The network "map" is like this: My PC -> my router -> my ISP's router -> internet On my PC, the DNS is set automatically which means that if I run iconfig /all, my router will be returned as the DNS server (192.168.1.1). On my router, the DNS is set to be what my ISP provided me with. Is this correct? What can I do to see new hostnames resolved quicker?

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• In VirtualBox, how can I access host localhost from guest (Visual Studio Dev Server from IE7 testing VM)?

  - by Seth

  Host OS is Win7 running MyApp in the Visual Studio Development Server, bound to localhost:51227, VM is VirtualBox configured with NAT. Guest OS is Win XP with IE7 installed. My goal is to debug MyApp (running on host) from within IE7 (running on guest). Visual Studio Development server only binds to the loopback network device (i.e. localhost). It does not bind to the external IP address of my host. I've tried access 10.0.2.2:51227 from IE7 on the guest (and confirmed that 10.0.2.2 is the gateway address using ipconfig), but it appears that 10.0.2.2 binds to the external IP of the Host, NOT the loopback IP (localhost), so this does not work. Any suggestions?

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• DNS record reappears after having been deleted

  - by palmbardier

  I've got a Microsoft Windows Server 2003 R2 acting as a domain controller for a small network. It provides DHCP and DNS among a few other services. It's only got a single NIC, but it's configured with two IP addresses. I want it's name to resolve to one of the two IP addresses assigned to its NIC. I've unchecked "Register this connection's addresses in DNS" under the "Advanced TCP/IP Settings". Currently we've got two distinct DNS Host (A) records for this domain controller: dc-001 - 10.0.0.1 dc-001 - 10.0.100.1 I've deleted the first entry but it continues to reappear in my dnsmgmt snap-in. Unfortunately I'm not a Microsoft systems administrator by trade. Does anyone familiar with Microsoft server environments know why a deleted Host (A) record would reappear? Is there another check-box I need to toggle? Thanks in advance to all of you Microsoft experts out there.

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• Routing DHCP traffic over the internet

  - by rmanna

  i'd like to know if it's possible for the internet to be between a DHCP server and the network it's "assigned" to? so basically, something like this: -------------- ------------- ------------- | DHCP Server | | DHCP | | Clients | | |-----Internet-----| Relay Agent |------| 192.168.0.* | | | | 192.168.0.1 | | | -------------- ------------- ------------- the behavior i'm seeing is that the DHCP server is offering 192.168.0.* IPs and sending them back to 192.168.0.1, which it can't reach. i tried masquerading the packets sent by the relay agent but that doesn't seem to work. from what i've been reading, this is normal behavior since the DHCP server uses the GIADDR as the destination address for its OFFERs, and not the actual source IP of the packets it receives from the relay agent. sooo, given that my DHCP server needs to be "on the other side of the internet" as depicted above, how can i get this working? are there settings for dhcpd to do this or is creating a VPN containing the DHCP server and the relay agent the only way? thanks!

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• 'hijacking' gui and mapping certain controls to certain functions. VNC. TouchOSC

  - by Nick

  I need a VNC LIKE application which rather than sharing the screen, can take control of a specific application and then share that functionality across a network to multiple clients. Obviously, VNC requires use of the mouse and therefore only one user can do something at one time, this is NOT what I am after. I am after something that can hijack the graphic user interface, map certain controls, and then display them in another piece of software (perhaps like TOUCHOSC) The software I would like to map and share is called YAMAHA STUDIO MANAGER and is used to control certain Yamaha audio hardware, and in my case a Yamaha LS9 and M7CL mixing console. Its free.

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• Does OO, TDD, and Refactoring to Smaller Functions affect Speed of Code?

  - by Dennis

  In Computer Science field, I have noticed a notable shift in thinking when it comes to programming. The advice as it stands now is write smaller, more testable code refactor existing code into smaller and smaller chunks of code until most of your methods/functions are just a few lines long write functions that only do one thing (which makes them smaller again) This is a change compared to the "old" or "bad" code practices where you have methods spanning 2500 lines, and big classes doing everything. My question is this: when it call comes down to machine code, to 1s and 0s, to assembly instructions, should I be at all concerned that my class-separated code with variety of small-to-tiny functions generates too much extra overhead? While I am not exactly familiar with how OO code and function calls are handled in ASM in the end, I do have some idea. I assume that each extra function call, object call, or include call (in some languages), generate an extra set of instructions, thereby increasing code's volume and adding various overhead, without adding actual "useful" code. I also imagine that good optimizations can be done to ASM before it is actually ran on the hardware, but that optimization can only do so much too. Hence, my question -- how much overhead (in space and speed) does well-separated code (split up across hundreds of files, classes, and methods) actually introduce compared to having "one big method that contains everything", due to this overhead? UPDATE for clarity: I am assuming that adding more and more functions and more and more objects and classes in a code will result in more and more parameter passing between smaller code pieces. It was said somewhere (quote TBD) that up to 70% of all code is made up of ASM's MOV instruction - loading CPU registers with proper variables, not the actual computation being done. In my case, you load up CPU's time with PUSH/POP instructions to provide linkage and parameter passing between various pieces of code. The smaller you make your pieces of code, the more overhead "linkage" is required. I am concerned that this linkage adds to software bloat and slow-down and I am wondering if I should be concerned about this, and how much, if any at all, because current and future generations of programmers who are building software for the next century, will have to live with and consume software built using these practices. UPDATE: Multiple files I am writing new code now that is slowly replacing old code. In particular I've noted that one of the old classes was a ~3000 line file (as mentioned earlier). Now it is becoming a set of 15-20 files located across various directories, including test files and not including PHP framework I am using to bind some things together. More files are coming as well. When it comes to disk I/O, loading multiple files is slower than loading one large file. Of course not all files are loaded, they are loaded as needed, and disk caching and memory caching options exist, and yet still I believe that loading multiple files takes more processing than loading a single file into memory. I am adding that to my concern.

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• Windows 7 - ICS - Xbox360

  - by Hailwood

  I am trying to connect my xbox360 to the internet through ICS using my laptop. I have done this a few days ago using the exact same hardware(so no hardware problems) The laptop can browse the internet. The laptop gets its settings though DHCP. I have enabled ICS on the Wireless connection (where the internet is coming from) I have set the xbox and the Wired connection on the laptop to obtain settings automatically. The issue is that the Wired connection only shows 'Unidentified Network'. What could i be doing wrong?

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• Type 1 Hypervisor on the desktop

  - by Blazemore

  I have a powerful home PC, and I've used VirtualBox to run Linux distros in Windows (and vice versa). I'm interested in trying out a lightweight type 1 hypervisor to run all my operating systems (Windows 7, Debian, Arch) and was looking for suggestions of which to pick and how to implement this. From what I gather, a type 1 hypervisor is a lightweight OS which simply provides VM management functionality. Will I get reasonable performance under each guest OS? Can all the guest OSs have access to a shared data drive, or is is best to have a storage server in another guest OS and mount it over the virtual network? What about gaming, is this feasible, or will I realistically need to run Win7 on bare metal? I'd appreciate any input.

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• How to configure multiple addresses on a single interface using Fedora 16

  - by cg.

  I upgraded from Fedora 14 to 16, recently. I had two static IP v4 addresses configured on my ethernet interface by creating two files in /etc/sysconfig/network-scripts: ifcfg-eth0 -> first address ifcfg-eth0:1 -> second address After the upgrade, this resulted in an error message during the boot process and in only the second address being successfully configured on the interface. So, what is the correct way to configure multiple addresses on a single interface on Fedora 16? I could not find anything on this subject in the documentation so far.

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• How to do proper Alpha in XNA?

  - by Soshimo

  Okay, I've read several articles, tutorials, and questions regarding this. Most point to the same technique which doesn't solve my problem. I need the ability to create semi-transparent sprites (texture2D's really) and have them overlay another sprite. I can achieve that somewhat with the code samples I've found but I'm not satisfied with the results and I know there is a way to do this. In mobile programming (BREW) we did it old school and actually checked each pixel for transparency before rendering. In this case it seems to render the sprite below it blended with the alpha above it. This may be an artifact of how I'm rendering the texture but, as I said before, all examples point to this one technique. Before I go any further I'll go ahead and paste my example code. public void Draw(SpriteBatch batch, Camera camera, float alpha) { int tileMapWidth = Width; int tileMapHeight = Height; batch.Begin(SpriteSortMode.Texture, BlendState.AlphaBlend, SamplerState.PointWrap, DepthStencilState.Default, RasterizerState.CullNone, null, camera.TransformMatrix); for (int x = 0; x < tileMapWidth; x++) { for (int y = 0; y < tileMapHeight; y++) { int tileIndex = _map[y, x]; if (tileIndex != -1) { Texture2D texture = _tileTextures[tileIndex]; batch.Draw( texture, new Rectangle( (x * Engine.TileWidth), (y * Engine.TileHeight), Engine.TileWidth, Engine.TileHeight), new Color(new Vector4(1f, 1f, 1f, alpha ))); } } } batch.End(); } As you can see, in this code I'm using the overloaded SpriteBatch.Begin method which takes, among other things, a blend state. I'm almost positive that's my problem. I don't want to BLEND the sprites, I want them to be transparent when alpha is 0. In this example I can set alpha to 0 but it still renders both tiles, with the lower z ordered sprite showing through, discolored because of the blending. This is not a desired effect, I want the higher z-ordered sprite to fade out and not effect the color beneath it in such a manner. I might be way off here as I'm fairly new to XNA development so feel free to steer me in the correct direction in the event I'm going down the wrong rabbit hole. TIA

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• Ubuntu, connecting to WEP

  - by Holly

  Hello, I successfully installed Ubuntu onto my usb hard drive. However, I'm not sure what the issue is with my internet. I'm not familiar enough with ubuntu to know whether this is a problem with recognizing my wireless card or with my internet, etc. So I suppose my question is, how do I tell whether it's recognizing my wireless card? (Network manager isn't showing any wireless signals, though I wasn't sure if it was supposed to. ) And, if it's not working, how do I go about troubleshooting that issue? Thanks!

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• My HP ProBook 4520s running Windows 7 hangs intermittently

  - by Rory Alsop

  I have not been able to trace a consistent cause, but a few times a day my laptop will hang for up to about a minute. I can still move the cursor which displays as the wait icon for whatever application I was last in, but cannot carry out any other actions. Unfortunately I can't Ctrl+Alt+Del to bring up a task manager and I just have to wait. I can't pin it down to a particular application either, but generally I have either office apps, a browser or other tools open. I'm tempted to think it may be network timeout on something, as I can't think of anything else which would delay for that long with such a significant impact, but as I'm more a Unix person I thought it would be worth asking here.

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• Exchange and external mail server

  - by Bahrain Admin

  Hi, We have our domain hosted externally with Network Solutions, and our mail server is running from there. We have a branch office in Bahrain and have 3 users who would like to use their email addresses on a local exchange server running at the Bahrain office. The Exchange server is currently only used for internal mail,contacts and calendaring. I've used a third=party program to download the POP3 mail to their exchange accounts. so they can receive mail from outside. The issue is in sending mail using their external addresses. I've setup their exchange accounts to include their external address. But we get an error message stating that the IP is not authorized. I tried putting the local ISP as the smart host, but then we get an error message stating that the Address was rejected. I tried using our own external mail server as the smart host, but then the message "Relaying is denied" comes up. Any suggestions? Thanks Arun

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• Is there a way to share a scanner with an Airport Extreme?

  - by Electrons_Ahoy

  I've got an Airport Extreme as my home network's router. (Sidebar: I love it.) The printer sharing is pretty phenomenal - I've got my printer hooked up to the base station and all the machines in the house can print to it just fine. However, I have one of those combined scanner/printers, and nothing on the lan seems to be able to see the scanner. Is there a way to get the Airport Extreme / Bonjour to also share the scanner half of the device? For the record, this is an all Windows LAN, so I'm using Bonjour for Windows to get the print sharing to work. Also, I'm hoping to not add a whole stack of extra software to the ecosystem - only one machine in the house needs the scanner, so I can just plug the printer back into that machine and share the printer that way. Still, the Airport and Bonjour seem fancy enough that this seems like it should be doable.

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• Block (or only allow certian) incoming IP addresses on Verizon FIOS Actiontec Router

  - by jmlumpkin

  I opened a few ports to the outside of my home network so I can get into a few of my machines from outside. When checking some logs, I noticed that I was getting scanned on some ports from various other countries. I already moved my port forward to a non-standard port. I would like to be able to block specific IP's (or even subnets) from my Verizon FIOS router. There is a little bit of documentation online, but I can't find anything specific on how to do this. To start, I just want to block a specific IP. But if it is not to hard, I would also like to know how to possibly block a range of IPs. And with the inverse of this - is there a way to allow only certain IPs or range?

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• Apache web server: "proxying" a webapp from another server?

  - by Riddler

  Sorry for the lame terminology - I'm no way a sysadmin... So here's the deal. I have two Linux boxes in the same network, let's refer to those boxes by their IPs, a.b.c.d and e.f.g.h. Each box runs some webapp, normally available like http://a.b.c.d/ and http://e.f.g.h/. What I want to accomplish is this: with some Apache web server (which by the way lives on both boxes) configuration voodoo, the first app would be available via http://a.b.c.d/whatever1/, and the 2nd app would be available as http://a.b.c.d/whatever2/ - but would still reside on another server (e.f.g.h). Long story short - is it at all possible to do this with Apache configuration magic and without touching the webapps and their configuration? If so - how? :) Thanks in advance!

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• What is the "real" difference between a NAS and NFS?

  - by warren

  From an end-user perspective, what is the difference between a NAS device and using NFS exports from a file server? They seem to accomplish the same end result. The difference between a SAN and other file storage is related (in my experience) to how they are connected to the server infrastructure. However, the difference between a NAS, connecting over standard ethernet, and NFS (sharing storage off specific servers, also over the network), seems more nebulous. Is there a good reason to pick a NAS filer over NFS on servers?

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• Created a new zone in DNS manager - can't get site bindings to work in iis 7

  - by nick gowdy

  Firstly I would like to say that I am a noob when it comes to DNS, I am a web developer and I am trying to setup an intranet site for a charity. I have windows server 2008 and I installed both iis 7 and dns manager. In IIS I have this binding that works - Type: http:// IP Address: 192.168.1.9 Port: 80 Host name: My host name is empty and when I try to navigate to this website on the network, the http code is 200 and the page renders. Now if I try Host name of test.organization.intranet Internet explorer says "Internet Explorer cannot display the webpage" and the server response is aborted. In DNS manager I created a new forward lookup zone of organization.intranet I did this through the configure a dns server wizard and I created a host (A) with the same IP as the one being used in IIS. The full Host name is test.organization.intranet but it doesn't work. Maybe I am missing something obvious because it's not an area of IT that I know very well, but I am stuck for why I can't get it to work.

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• Windows 7 - Static DHCP server address with dynamic IP Address

  - by mkstreet

  Is this possible? On my LAN, I would like to setup the network properties such that the DHCP server's address is static. However, I want that server to hand out the IP Addresses and DNS addresses dynamically. The reason is that some devices on the LAN will try to behave like a DHCP server. For example, we use software to push images to computers on the LAN (our computer software configurations are centrally managed). When that imaging distribution software happens to be running, the machines being imaged will get confused as to which device is the DHCP -- the real one or the machine that is sending them the image. So, to remove the confusion, I would like to setup my Windows 7 images such that the DHCP server address is statically assigned. And then that server would assign the IP Addresses and the DNS addresses dynamically.

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• Remote Desktop Problem on Windows Server 2008 R2

  - by lukiffer

  Revised this question to be more concise, consolidating several revisions. Symptoms: From a domain-member Windows 7 Client: Domain credentials to a domain controller = success Domain credentials to a member server (by hostname or FQDN) = success Domain credentials to a member server (by IP) = fail Local credentials to a member server (by either) = success From a non-domain-member Windows 7 Client: Domain credentials to a domain controller = success Domain credentials to a member server = fail Local credentials to a member server = success (Identical behavior from a Mac RDC 2.1 client) Server Configuration Details: Windows 2008 R2 Datacenter w/ SP1 The domain in question is a subdomain of a Windows 2008 domain (forest root). Root has DCs in both Site A and Site B, subdomain only has DCs in Site B. RDP is operating normally on all root member-servers and DCs. No remote desktop settings are defined by GPOs. Network level authentication is enabled; all clients are compatible and the certificate exchange/SSL handshake completes successfully. Not catching any errors in netlogon log.

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• Constantly visible notification and access icon for Empathy in Gnome 3

  - by aef

  Since a short while I'm using Ubuntu Oneiric Ocelot (11.10) with gnome-shell (Gnome 3) and I'm trying to get accustomed to the default Empathy Instant Messaging client. One mayor problem for me (coming from Gnome 2 and Psi) is that there is no constantly visible icon which makes it clear (for example by changing its icon or showing an animation) if there are incoming messages which I did not read already and which lets me jump into them with one click. Also I'm missing a way to bring up the contact list or hide it away with a click. I sometimes have real problems even figuring out how to even open the contact list up again. Is there a Gnome 3 extension or some other trick available to display such a notifier in the top bar? I'm talking about something just like the sound and network controls which are already located there. I know that there are notifications in the lower notification area (former system tray), but as it is only visible as I move the mouse in the lower right corner of the screen, its useless for me.

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• Syncing Large Directories/Filesystems using USB Drive [closed]

  - by Alan Lue

  Does anyone have a solution for syncing large directories/filesystems using just a USB flash drive (and specifically without using a network connection)? The objective is simply to sync a user directory between two computers. The contents of the user directory could amount to a large quantity of data—say, a quantity larger than could be stored on any single USB drive—but the aggregate size of changes that must be propagated by a single sync could easily fit on a USB drive. As an example, suppose a user directory is already synchronized between a desktop and a laptop computer. Here's a use case: Some changes are made in the user directory on the desktop. We mount a USB drive onto the desktop and copy whatever changes need to be applied to the laptop user directory in order to synchronize the desktop and laptop user directories. We now mount the USB drive onto the laptop and apply the changes. The desktop and laptop user directories are now synchronized. Any ideas? Alan

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• How can I stop ntbackup requiring my new password every time I'm forced to change my Windows passwor

  - by Lunatik

  I have a scheduled job that runs each night using ntbackup which copies a folder on my HDD to a network share. The problem is that every time I'm required to change my Windows password I have to remember to change it in ntbackup aswell, otherwise the backup fails silently i.e. I get no warning that the backup isn't being done. Is there a way to schedule this job so it will automatically pick up my new Windows password, or somehow not be tied to my main login? My user account type is Debugger, not full Administrator, so I'm not sure if that would restrict me in any way, e.g. still forcing a four-weekly password change on a dedicated user account for this. The PC runs XP SP2 on a Windows Server 2003 R2 domain.

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• Route a specific user's traffic via VPN but still allow local networking

  - by wbg

  So, I want to route certain traffic via a VPN connection and the rest via my normal Internet connection. I want to run several different programs and most of them don't support binding to a specific network interface (tun0 in my case). I've managed to send a specific user's traffic via the VPN following the answers given here: iptables - Target to route packet to specific interface? But unfortunately, when I run a server that connects to the Internet and has a web interface running on a local IP (127.0.0.1/192.168.0.*), all the Internet traffic correctly goes via tun0, but I'm unable to connect to the web interface from a local IP as a different user. When I log in as the VPN-ified user, I can access services running on local IPs, but other users/machines can't access any servers I start. Can anyone point me in the right direction?

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