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• Ubuntu 12.04 wireless disabled even though the direct connectin (thru modem) is working fine

  - by user90841

  Need help with my newly installed Ubuntu 12.04 system (dual booting along with Win 7), even thoguh I can use internet using the modem and directly plugging it, the wireless network is disabled and it says firmware missing. I tried the following options: 1) checking to see if the wireless is disabled using the hot keys (F2 or Ctrl+F2, Fn + F2 keys), the wireless is working fine in Win 7 but not in Ubuntu. 2) I am able directly plug the laptop with the modem and able connect to Internet using Ubuntu. 3) From the top right hand menu bar, te Wireless networks options say "device not ready (firmware missing) and the Enable Wireless checkbox is checked. 4) tried the command "rfkill list" , it shows all are NOT blocked. 0: phy0: Wireless LAN soft blocked:no Hard blocked: no 1: dell-wifi: Wireless LAN soft blocked:no Hard blocked: no 2: dell-bluetooth: BlueTooth soft blocked:no Hard blocked: no 3: hci0 Bluetooth soft blocked:no Hard blocked: no 5) ifconfig command shows eth0 and lo (lcoalhost) up and running but the wlan0 option is not available to show unless I type ifconfig -a, when it shows wlan0 but its down. 6) The command lspci -vvnn | grep 14e4 shows 04:00.0 network Controller [0280]: Broadcom Corp BCM4312 802.11b/g LP-PHY [14e4:4315] {rev 01) 08:00.0 Ethernet Controller [0200]: Broadcom Corp Netlink BCM5784M Gigabit Ethernet PCIe [1434:1698] {rev 10) 7) The file /var/lib/NetworkManager/NetworkManager.state shows all options are true (networking enabled, wireless enabled, wwlanenabled and wimaxenabled all options are set to true). 8) 'additional drivers' in your Dash and/or Preferences do not bring up anything at all. 9) output for lshw -C network shows *-network DISABLED description : Wireless interface physical id: 4 logical name: wlan0 serial: 78:e4_00"43:b6:ab capabilities: ethernet physical wireless Configuration: broadcast=yes driver=b43 driverversion=3.2.0.29-generic-pae firmware=N/A link=no multicast= yes wireless=IEEE 802.11bg

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• An device with an unknown MAC address is connected to my router

  - by Yar

  There is a computer that is not mine that is accessible on my network. I can even access its filesystem via AFP. What I want to know is how the computer could get on my network. My network is secured like this: Does that mean that they've used password cracking tools? The pass is not easy to guess but not hard to figure out via brute-force hacking, I guess. If I am being hacked, should I switch to WPA?

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• Failure Scenarios in IP networks [closed]

  - by Karthik

  I am searching for a list of faults that may occur in a traditional IP network. To give you a better understanding of what I am looking for: For an MPLS-IP network the set of faults may be something as given in this cisco site. I want pointers to such kind of faults for a traditional IP network. Individual suggestions from you are welcome, but in doing so, please also provide a link to the official site from which you came with those failure scenarios.

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• Proxy Server suggestions

  - by Jon Menefee

  Here is the question I have that hopefully is not too general of a question. I have a network with approximately 25 PC's, 3 servers and 25 IP cameras. I have a firewall already on the network and it works fine for what I need, but my client is asking me if there is a way to put a Proxy server on the network to monitor where his employees are going when they surf the Internet. He is not wanting to block them (at least not thru the Proxy server), but he wants to make sure that they arent going to sites that would compromise the networked PCs. I have looked at TMG and it is a little more than what I want. I hesitate adding another firewall to the system because of the security cameras that are presently on the network (IP Cameras). I just want to put a policy in AD that would make certain Users (or Computers) use a Proxy server. Any suggestions on a good proxy server are welcome. Thank you

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• (Windows 7) Dial Up Connection Locks up the Networking Service

  - by Nick

  I connect to the internet by using my cell phone as a dial up modem. (shh, don't tell my service provider) The connection is usually seamless and the speed is good (150kbps) but occasionally, the connection will get terminated by either the phone or the network, I'm not sure which and then Windows7 stubbornly doesn't acknowledge that the connection is dead so I can re-dial. I have tried to manually kill the connection, but then anything related to the network service refuses to open and the connection is still there. No "Network and Sharing Center", "Network Devices" and often the tray menu will refuse to pop open. The only way I have found to clear the problem is a full restart which. Logging off doesn't work and I haven't been able to find the service that is frozen. If anyone knows how to fix this or prevent this from happening or even how to go about troubleshooting I would be very grateful. ps. This problem is non-existant when tethering in linux on the same machine. (Ubunutu 9 and JoliOS)

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• Internet connection issues after installing Windows Phone 8 SDK

  - by Mosquito

  first of all I must admit, that I'm not good in all this network stuff. I am using Windows 8 OS. On my laptop (Lenovo G570) I have installed Windows Phone 8 SDK and shortly after this I started having weird issues with internet connection. When I start my laptop, internet usually works fine, but after a few minutes it starts slowing down so much, that I'm not able to open a single page. Rebooting doesn't work, after several disabling and enabling network adapter, it usually works again for a few minutes and then again it stops. I'm sure it has something to do with Windows Phone 8 SDK, because problems started with this. With SDK there was also installed "vEthernet (Internal Ethernet Port Windows Phone Emulator Internal Switch)" network adapter. It is worth to note that problems occur mostly in my school network, not at home. Both at home and school I am using Wi-Fi connection. I hope the information given are enough to help me. Thanks in advance for any answers!

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• How can I trick ssh to connect using different configurations based on current location?

  - by Sorin Sbarnea

  Here is the following use case: wanting to ssh server1 in 3 scenarios: server1 is on current network, go for it server1 is not on current network and you need to use a gateway (gw1) to access it, not a big problem as you can use ~/.ssh/config to define tunnelling for this you are on a network that does not allow you to access the first gw1, so you'll use gw2 for that. Desired outcome: be able to use the same command and be able to connect to the server.

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• An unknown Mac is connected to my router?

  - by Yar

  There is a computer that is not mine that is accessible on my network. I can even access its filesystem via AFP. What I want to know is how the computer could get on my network. My network is secured like this: Does that mean that they've used password cracking tools? The pass is not easy to guess but not hard to figure out via brute-force hacking, I guess. If I am being hacked, should I switch to WPA?

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• Router as primary DNS server, Server as alternate? (or vice versa)

  - by Jakobud

  We have a very small business network, with a typical cable modem hooked into a DD-WRT router. We also run a basic CentOS server that does a variety of things, including acting as the primary DNS server for the office. The reason we need an internal DNS server is because we do a lot of internal web development and use the DNS server to add/remove various local network URLs for internal website testing (like www.testsite.com.local). It's very important for us to be able to add/remove URL aliases easily to the DNS. The problem with this setup is that if we ever need to restart the CentOS server or take it offline for upgrades or whatever, then internet access for all computers on the network is lost. That's because each computer relies on that DNS server to access the Internet I guess? The router is online all the time and very very rarely has to be restarted. It would be nice if we could setup my router to be the primary DNS server but still be running DNS on my server. So we could still add my local testing website URLs to the DNS server in CentOS, but be able to also take down the CentOS server without loosing Internet access on the network. How would this be setup? Would I simply need to add both router + server IP addresses to each computer's IP settings? Is the router primary DNS and server secondary DNS server? Or vice versa? Or can one of the two serve as a fallback for the other? What (if anything) needs to be configured on both the router and server in order for them to recognize that the other DNS server exists on the network? Does anyone have any newb-friendly resources for setting up something like this?

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• Wrong Connection-specific DNS Suffix

  - by mydoghasworms

  I am on a Windows network with a Windows 7 machine. For some strange reason, when I run ipconfig, I see that I have the wrong DNS suffix for my network adapters, e.g. def.companyname.com as oppsed to abc.companyname.com. My colleagues next to me, who are on the same network, have the correct suffix. Where does the problem originate, and is it something I can fix on my machine (and if so, how?), or is this something a network administrator must resolve? (I did ipconfig /release and /renew, but that did not help).

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• How to setup IP alias on bridged interface in Ubuntu

  - by Anonymouslemming

  How do I setup an IP alias on a bridge (br0) device on Ubuntu ? If I wait for br0 to come up and then do /sbin/ifconfig br0:0 192.168.10.1 netmask 255.255.255.0 then it works fine. If however I add the following to my /etc/network/interfaces file, it does not work and the network fails to start: auto br0:0 iface br0:0 inet static address 192.168.10.1 netmask 255.255.255.0 At the moment, I have a script in /etc/network/if-up.d/bridge_alias that does this as follows: #!/bin/bash if [ "${LOGICAL}" == "br0" ] && [ "${PHASE}" = "post-up" ]; then echo -n "Starting br0:0 ... " /sbin/ifconfig br0:0 192.168.10.2 netmask 255.255.255.0 echo "Done!" fi What is the right way of doing this though, just using the OS network config files ?

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• Outlook2010 : Sending hyperlinks containing a space, <> is not working

  - by Biff MaGriff

  Previously I used Outlook 2003 and I was able to send a hyperlink with a space by typing < before entering the hyperlink and a > after typing the hyperlink and the whole thing would become a valid clickable link. Like so <\\network share with spaces\folder We upgraded to Outlook 2010 and currently this happens <\\network share with spaces\folder or if I do nothing \\network share with spaces\folder Is there a setting in one of these ribbons somewhere to control this?

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• LDAP hangs for 10-15 minutes if user put wrong credentials

  - by danny

  Hi: I am using a windows 2003 server .I am using LDAP to allow my wireless clients connect to the network. I can connect fine to the network. But whenever I enter a wrong credential my LDAP server freezes and no new clients can log in to the wireless network for 10 -15 minutes. i am using a cisco wlc and its doing web-authentication.

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• setting up static ip on linux

  - by user64908

  I understood the interface file in linux needs to be edited and the corresponding lines added. I don't understand what network and broadcast are for, it seems extra versus a windows static ip configuration. In my case my gateway is 192.168.5.1 and my machine ip is 192.168.5.101, what would be my network and broadcast address, is the below correct and what exactly do they mean? iface eth0 inet static address 192.168.5.101 gateway 192.168.5.1 netmask 255.255.255.0 network 192.168.5.0 broadcast 192.168.5.255

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• What exactly is a proxy?

  - by ojblass

  What does a proxy do and how is it related to getting out of my network to the outside network?

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• How to add usbnet driver to the Linux kernel?

  - by StackedCrooked

  I want to add usb network support to a real-time Linux distribution we're using at work. USB devices are recognized, but when connecting a usb network adapter no network interface is created. From what I've read this requires recompiling the kernel build with usbnet support enabled. I don't mind doing this, but the problem is that I can't seem to find any instructions on how to do this. Can anyone point me in the right direction?

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• VPN: Disable class based route addition for Windows XP/Vista

  - by brgsousa

  Paraphrasing this SuperUser link: When you set up a VPN, the Windows default is to enable "Use default gateway on remote network." A new default route is added to the routing table pointing to the remote network's gateway, and the existing default route has its metric increased to force all Internet traffic to traverse the tunnel and use the remote network's gateway. All traffic uses the VPN, and traffic destined for the outside world is directed to the remote gateway. When the VPN drops, the route to the remote gateway is removed and the original default route is set back to the original metric. Unchecking "use default gateway on remote network" means that new default route isn't added, so Internet traffic goes out the local gateway, but a new classful route is added to the routing table, using the local adapter's IP, pointing down the VPN. Only traffic destined for the classful network of the local adapter goes down the VPN. This may not be what you want. Checking "Disable class based route addition" means that classful route isn't added to your machine when the VPN starts up, and you'll need to add the appropriate routes for networks that should be routed through the tunnel. But, the option "Disable class based route addition" is available ONLY for Windows 7. How can I do something like that for Windows XP or Vista since they don't have that option? I have searched about for that but, no solution yet.

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• Mac on My Router?

  - by Yar

  There is a computer that is not mine that is accessible on my network. I can even access its filesystem via AFP. What I want to know is how the computer could get on my network. My network is secured like this: Does that mean that they've used password cracking tools? The pass is not easy to guess but not hard to figure out via brute-force hacking, I guess. If I am being hacked, should I switch to WPA?

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• Should Starting a Quick Game via Google Game Services be Iterated?

  - by user46727

  I have been following this tutorial for Google Play Game Services. I am a little unclear as to if the room matching algorithm should be looped or not. Can I just initialize this process once and let it time out? Or by iterating through it is it somehow rechecking it? If anyone had the approximate timeout that would be great as well. The problem stems from the fact that even when both phones are signing into the Game Services (at virtually the same time, my friend and I logged in), the room is not registering multiple people. One time my friend's phone even entered the game map, showing that he somehow was able to progress from the room initialization process. Relevant screen update methods which I am starting this matchmaking process: @Override public void update(float deltaTime) { game.options.updateTiles(); if(!isInitiated) { startQuickGame(); } } private void startQuickGame() { // auto-match criteria to invite one random automatch opponent. // You can also specify more opponents (up to 3). if(game.mGoogleClient.isConnected() && !isInitiated) { Bundle am = RoomConfig.createAutoMatchCriteria(1, 3, 0); // build the room config: RoomConfig.Builder roomConfigBuilder = RoomConfig.builder(Network.getInstance()); roomConfigBuilder.setMessageReceivedListener(Network.getInstance()); roomConfigBuilder.setRoomStatusUpdateListener(Network.getInstance()); roomConfigBuilder.setAutoMatchCriteria(am); RoomConfig roomConfig = roomConfigBuilder.build(); // create room: Games.RealTimeMultiplayer.create(game.mGoogleClient, roomConfig); // go to game screen this.mRoom = Network.getInstance().getRoom(); if(this.mRoom != null && this.mRoom.getParticipants().size() >= 2) { game.setScreen(new MultiGameScreen(game, this.mRoom)); isInitiated = true; } } else { game.mGoogleClient.connect(); } }

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• Workgroup connection: You may not have permission

  - by Afiefh

  I have two Windows XP computers connected through an Ad-Hoc network, computer A creates the network and B connects to it. Both computers are on the Mshome network and have file and printer sharing enabled, and they can ping one another through the adhoc network. The result is that computer A can see computer B, but B cannot see A in the workgroup. But when A tries to access B I get a "you might not have permission to access" error telling me to contact the administrator. I tries to google the error, but most posts talk about problems connecting different versions of Windows to each other. I tried turning off the firewalls on both machines and checking if the required services are running. Nothing helped. Please excuse my ignorance on Windows networking, I haven't used Windows in around 10 years.

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• Disable XF86Back and XF86Forward (browser back/forward on Lenovo Thinkpad)

  - by Nicolas Raoul

  My Thinkpad R500 has back/forward keys just about the direction keys, so on Firefox I keep losing entered text, accidentally. How to disable these back/forward keys? Excerpt from xev: KeyPress event, serial 29, synthetic NO, window 0x5e00001, root 0xbc, subw 0x0, time 2375874, (1279,794), root:(1285,881), state 0x10, keycode 166 (keysym 0x1008ff26, XF86Back), same_screen YES, XLookupString gives 0 bytes: XmbLookupString gives 0 bytes: XFilterEvent returns: False KeyPress event, serial 32, synthetic NO, window 0x5e00001, root 0xbc, subw 0x0, time 2377115, (1279,794), root:(1285,881), state 0x10, keycode 167 (keysym 0x1008ff27, XF86Forward), same_screen YES, XLookupString gives 0 bytes: XmbLookupString gives 0 bytes: XFilterEvent returns: False

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• IndexOutOfRangeException on World.Step after enabling/disabling a Farseer physics body?

  - by WilHall

  Earlier, I posted a question asking how to swap fixtures on the fly in a 2D side-scroller using Farseer Physics Engine. The ultimate goal being that the player's physical body changes when the player is in different states (I.e. standing, walking, jumping, etc). After reading this answer, I changed my approach to the following: Create a physical body for each state when the player is loaded Save those bodies and their corresponding states in parallel lists Swap those physical bodies out when the player state changes (which causes an exception, see below) The following is my function to change states and swap physical bodies: new protected void SetState(object nState) { //If mBody == null, the player is being loaded for the first time if (mBody == null) { mBody = mBodies[mStates.IndexOf(nState)]; mBody.Enabled = true; } else { //Get the body for the given state Body nBody = mBodies[mStates.IndexOf(nState)]; //Enable the new body nBody.Enabled = true; //Disable the current body mBody.Enabled = false; //Copy the current body's attributes to the new one nBody.SetTransform(mBody.Position, mBody.Rotation); nBody.LinearVelocity = mBody.LinearVelocity; nBody.AngularVelocity = mBody.AngularVelocity; mBody = nBody; } base.SetState(nState); } Using the above method causes an IndexOutOfRangeException when calling World.Step: mWorld.Step(Math.Min((float)nGameTime.ElapsedGameTime.TotalSeconds, (1f / 30f))); I found that the problem is related to changing the .Enabled setting on a body. I tried the above function without setting .Enabled, and there was no error thrown. Turning on the debug views, I saw that the bodies were updating positions/rotations/etc properly when the state was changes, but since they were all enabled, they were just colliding wildly with each other. Does Enabling/Disabling a body remove it from the world's body list, which then causes the error because the list is shorter than expected? Update: For such a straightforward issue, I feel this question has not received enough attention. Has anyone else experienced this? Would anyone try a quick test case? I know this issue can be sidestepped - I.e. by not disabling a body during the simulation - but it seems strange that this issue would exist in the first place, especially when I see no mention of it in the documentation for farseer or box2d. I can't find any cases of the issue online where things are more or less kosher, like in my case. Any leads on this would be helpful.

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• Disable "No Internet Access" warning on Windows 7

  - by Grhm

  I have a number of Windows 7 machines on an isolated development network. There is no internet access from this network. Winodws 7 displays a yellow warning triangle on the network connection icon with a warning "No Internet Access". Is there anyway to disable this warning - I know the internet is inaccessable and always will be.

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• How does a frame retrieve the recipient's MAC address?

  - by Sarmen B.

  I am studying a Network+ book named All-in-one CompTia Network+ by Mike Meyers. In chapter 2 he talks about frames and how he represents them as canisters and the data within the frame contains the recipients mac address, senders mac address, data, and sequence number. What I don't understand is if the sender is sending a file via the network to the recipient, and this frame contains this data, how does the frame know what the recipients MAC address is before sending it? In regards to TCP/IP when it contains the recipients IP address, that's understandable how it retrieves that value. But I don't understand how it can retrieve the MAC address, because if that frame comes from the senders computer, goes into the router and copies itself to each and every computer that exists on the network, how did it have the MAC address to know where to go? Let me know if I'm not making sense.

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• file sharing over external and internal networks

  - by pradvk

  Dear friends, Please tell me whether it is possible for someone on the external network to see the network folder shares of an internal LAN network in DHCP (192.168.x.x) through a Comp-A on an external network in DHCP (123.123.x.x) both networks are on different subnets but Comp-A has access to both networks and can see all the shared drives of both the internal and external networks using firewall is not an option because file sharing is required everywhere. care is taken from viruses/trojans... remote desktop etc is disabled on Comp-A Please let me know. Thanks and Regards pk

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