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• ubuntu 12.04 kvm virtual server network setup, can't get the machine to be connectable

  - by xyious

  I have worked on my Ubuntu Server host for weeks now and I just can not manage to get the virtual machines into the network.... here's what I need to do: I need to be able to create virtual machines that have IP addresses that can be reached from the outside (192.168 network). I need to be able to connect to the virtual machines through ssh, ftp, http and preferably https, anything else doesn't matter that much. So far everything seems simple enough and I have a lot of leeway in terms of IP address range and server/client configuration. I have the option of taking part of a /24 net as most IPs aren't used, and if it's absolutely necessary I have the option of creating a new /24 subnet. Also have the option of reformatting and reinstalling OS on the host and recreating the virtual machines as nothing has been done other than trying to get virtual machines to work. I would prefer if the virtual machines were just part of the normal network which would be 192.168.5.0/24. The host machine has 2 network cards so I don't even necessarily need the Host to be connectable in the same /24 network. I have tried (I think) just about everything from about 5 different tutorials on bridging (giving br0 the same IP that eth0 used to have (Host is able to connect to VM and vice versa, VM doesn't have outside network access), having eth0 set up like it always was and having br0 have a different IP (same as above), NAT with port forwarding (which I would have preferred not to use but will if it works), turning off one of the hosts network cards and just using one of them, different subnets.... etc. I do know my way around iptables fairly well.... Host is 64bit Ubuntu Server 12.04, using libvirt/kvm. edits: Local network is 192.168.5.0/24, host has static ip 192.168.5.254, GW .5.1 which is also nameserver. We have a second Local network at 192.168.10.0/24 with .10.1 GW, but both hosts and VMs were supposed to go into the .5 subnet. The .10 subnet isn't required, but it wouldn't be horrible if the Host were only accessible in the .10 subnet.

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• Why is iTunes using so much data?

  - by George

  I've been told by my ISP I'm using too much bandwidth so after using Activity Monitor to see that I'm using ~2GB a day I've used the nettop command line utility to work out where. Turns out it's iTunes. I don't use it for downloading/streaming music (other than podcasts of which I definitely don't have 2GB of new ones a day) or movies. What is iTunes doing? This is on a late 2009 MacBook running Lion 10.7.5 with iTunes version 10.7

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• ping preload is not permitted, what could be the reason?

  - by Brogrammer

  I am trying to ping one of my local host and checking CPU process to see how "Ping of death" attack behaves. I tried to ping my other PC which is in local network with 192.168.44.2 IP Address. I tried this, ping -l 5000 192.168.44.2 and I got error like this, ping: -l flag: Operation not permitted I am on MacOSX Lion. How can I remove this flag so machine can let me ping with preload? Thanks for any direction!

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• Preventing apps to access info from wifi device?

  - by heaosax

  Browsers like Chrome and Firefox can use my wifi device to get information about the surrounded APs and pin point my physical location using Google Location Services, I know these browser always ask for permissions to do this, and that these features can also be "turned off". But I was wondering if there's a better way to prevent ANY application to access this information from my wifi device. I don't like anyone on the internet knowing where I live, and I am worried some software could do the same as these browsers but without asking for permissions. I am using Ubuntu 10.04.

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• Dns.GetHostEntry is not giving me a good IP to pass to IPEndPoint function in my domain

  - by Beach Miles

  My c# code from my asynchronous socket client to get the address of my socket server. string testServerIP = "192.168.0.1"; IPHostEntry ipHostInfo = Dns.GetHostEntry(testServerIP); //time server address IPAddress ipAddress = ipHostInfo.AddressList[0]; IPEndPoint remoteEP = new IPEndPoint(ipAddress, port); I get the following error message from the above code. CheckServerReconnect:Cant connect to 192.168.0.1 The requested name is valid and was found in the database, but it does not have the correct associated data being resolved for

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• Protocol (or service publish/discovery) to detect devices in network

  - by Gobliins

  we connect some embedded devices in a network. What i am looking for now, is a way to find the devices IP and identify them. We work with Windows PC´s and i am about to write a C# tool that should do this. I thought about send a udp broadcast and in the ack i.e. is the device´s ip, which would mean the device needs a daemon runnig to assign an ip itself. Running a service (like a printer) on the device, and on the PC just lookup for the service. I read about some things like apipa, zeroconf, ipv4 local link, bonjour, dns-sd, mdns, bonjour; They can automatically assign ip´s and publish services in a network. My Question is, can someone recommend me what would be good for my task? -The protocol or Service should be low on ressource (memory/cpu usage) use. -Are there some standard protocolls to use? -Is DNS a good idea or would it be to ressource consumpting just for finding a device´s IP? -Should also work when no dhcp servers are around. edit: To clarify a bit: The IP configuration is automatic. The problem to focus is how to tell the PC which IP in the network (or a direct connection in this vase there would only be one) belongs to the device (identity).

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• Share Only 1 folder using SMB

  - by SnippetSpace

  I want to share my "My Videos" folder using Windows's built in SMB. The problem is that when I decide to share my video folder and check it on another device, the path always is: networkname>username>my videos instead of just my videos I noticed that indeed sharing gets turned on from the user folder down to the video folder instead of just on the folder I selected. So now my question is why this is happening; And how cold I just display my "my Videos" folder on my remote device and not the entire path? BTW device in question is a hacked Apple TV. thank you for your help! Christopher

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• Windows Update broke Wirless driver - Can't get it working again

  - by private_meta

  I naively installed a driver update incoming from Windows Updates yesterday. That caused my Wifi on my Notebook (HP ELitebook 2740p) to break. The network is working as I tried it with my other mobile devices. When installing said driver, it told me that the installation failed. I tried to do a system restore, which did not help getting wifi connectivity back. The device said it was working, but did not get any wifi connection and did not discover any networks. What I tried next was to uninstall the device from my Device Manager and install either the current drivers found through windows, then I tried the same with the current drivers on the HP driver page. both of those attempts failed. It always tells me that installation failed when I uninstall and reinstall drivers. If I try to update the broken driver via internet, it tells me it is up to date, and in the device manager it still views as broken. Next, I 'played' around a bit and reinstalled drivers, and I managed to install drivers from 2012, and when trying to update drivers manually and picking drivers that match the device, it lets me choose between drivers from 2010 and 2014. 2014 would be the current one, picking the 2010 driver leads to the driver being accepted. However, no wireless network can be found. I'm pretty much out of ideas by now, short of reinstalling. The only option I can still think of was that the device broke at the exact moment I installed the new windows driver, but I find that a bit unlikely. Any help would be appreciated fixing this issue.

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• How can I monitor network usage by process on Mac OS X?

  - by psmith

  Is there any way to find out which process using how much internet bandwidth on Mac OS X Lion? I'm on mobile internet now, which is not very fast, so it would be nice if I can tell that for example, Chrome using 10kB/s, and Skype using 2kB/s. I can see the total amount of traffic in Activity Monitor, but it is not enough for me. I'd like to use an existing application, not interested to write an app like this. And I'm not interested in the actual traffic, only the number of bytes transferred and received by each processes.

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• How to change the setting for a network device reported by ethtool, specifically Speed, on VM?

  - by Ramadheer Singh

  This is related to these two questions, although they don't answer my question. The machines are RHEL6. 1.ethtool not showing all the properties 2.changing network speed to 1000Mb/s Output on VM: [root@foo ~]# ethtool eth0 Settings for eth0: Current message level: 0x00000007 (7) Link detected: yes Output on Real Hardware: (interested in Speed) # ethtool eth0 Settings for eth0: Supported ports: [ TP ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Supports auto-negotiation: Yes Advertised link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Advertised auto-negotiation: Yes ***Speed: 1000Mb/s*** Duplex: Full Port: Twisted Pair PHYAD: 1 Transceiver: internal Auto-negotiation: on Supports Wake-on: d Wake-on: d Link detected: yes if there's anyway I can set this in VM, please suggest.

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• Can't see a Windows XP computer on the network

  - by user56614

  I have two PC's connected to the same router. One is running Vista Home Premium and the other is running XP Pro. I'm trying to reach the shares of second PC from the first PC. I've enabled file sharing on the XP PC, I've disabled firewall and defender, and I can successfully ping it from the Vista PC. Both computers are set to the same workgroup "WORKGROUP". However, if I try to type "\\192.168.1.2" in Windows Explorer (192.168.1.2 being the IP address of the XP PC), I get a message: "Windows can't access \\192.168.1.2... Error code: 0x80004005 Unspecified error". And If I type "net view \\192.168.1.2" in command prompt, I get "System error 53 has occurred. The network path was not found." Am I missing something trivial?

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• Network config / gear question

  - by mcgee1234

  I have been tasked with setting up a fairly straightforward rack in a data center (we do not even need a whole rack, but this is the smallest allotment available). In a nutshell, 4 to 6 servers need to be able to reach 2 (maybe 3) vendors. The servers needs to be reachable over the internet. A little more detail - the networks the servers need to reach are inside of the data center, and are "trusted". Connections to these networks will be achieved through intra data center cross connects. It is kind of like a manufacturing line where we receive data from one vendor (burst-able up to 200 Mbits), churn through it on the servers, and then send out data to another vendor (bursts up to 20 Mbits). This series of events is very latency sensitive, so much so that it is common practice not to use NAT or a firewall on these segments (or so I hear). To reach the servers over the internet, I plan to use a site to site VPN. (This part is only relevant as far as hardware selection goes). I have 2 configurations in mind: Cisco 2911 (2921) (with the additional wan ports module) and a layer 2 switch - in this scenario, I would use the router also for VPN. Cisco 3560 layer 3 switch to interconnect the networks inside of the data center and an ASA 5510 (which is total overkill, but the 5505 is not rack mountable) as a firewall for the Wan side (internet) and VPN. I envision the setup to be as follows: Internet - ASA - 3560 Vendors - 3560 - Servers The general idea is that the ASA acts as a firewall and VPN device and the 3560 does all the heavy lifting. The first is a fairly traditional setup but my concern is performance. The second is somewhat unorthodox in that the vendors are directly connected to the layer 3 switch without passing through a firewall. Based on my understanding however, a layer 3 switch will perform substantially better as it will do hardware (ASIC) vs. software switching. (Note that number 2 is a little over the budget, but not unworkable (double negative, ugh)) Since this is my first time dealing with a data center, I am not sure what the IP space is going to look like. I suspect I will retain a block(s) of public IPs, vlan them to individual interfaces for the vendor connections and the servers (which will not reachable from the wan side of course) and setup routing on the switch. So here are my questionss: Is there a substantial performance difference between 1 and 2, i.e. hardware based switching on a layer 3 vs a software base on the 2911? I have trolled the internet and found a lot of Cisco literature, but nothing that I could really use to get a good handle. The vendors we connect to are secure and trusted (famous last words) and as I understand it, it is common practice not to NAT or firewall these connections (because of the aforementioned latency sensitivity). But what what kind of latency are we really talking about if I push the data through a router (or even ASA for that matter)? For our purposes, 5 ms will not kill us, 20 or 30 can be very costly. Others measure in microseconds, but they are out of our league. Is there any issues with using public IPs on a layer 3 switch? I am certainly not married to either of these configs, and I am totally open to any ideas. My knowledge (and I use the term loosely) is largely from books so I welcome any advice / insight. Thanks in advance.

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• Sharing RAM resources between 2 or more computers

  - by davee44

  I know there was a somewhat similar question before: How to share CPU or RAM? But, let me just specify it a little more... When Microsoft Windows requires more RAM capacity than available it uses a swap-file to temporarily store the data there, this is actually something like a hard-drive-based RAM. This technology is used for many years. Theoretically, it shouldn't be too hard to implement a similar technology that uses the RAM of different computer(s) in the network for temporary data storage. This just requires a software that runs on computers in the network that accepts and returns data from/to the main computer and keep that data in the RAM; plus the operation system of the main computer must have the ability to use computers in the network instead of (or in addition to) the swap-file. I wonder, are there any implementations of this idea? This would allow users to build RAM clusters using all of their home or office computers, that will boost the performance of a single computer for some development/gaming/video tasks, etc.

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• Secondary fallback/failover network on Cisco ASA

  - by tyranitar

  In my network there is a Cisco ASA 55x0 with "inside" interface (network 192.168.79.0/24) and "outside" interface (network 89.x.x.48/29) There is this nat rule: object network NAToutside nat (inside,outside) dynamic interface and the static route route outside 0.0.0.0 0.0.0.0 89.x.x.49 1 and all ACL rules. Now I have another new outside network by another ISP called "outside2", this network is already natted and the Cisco ASA in in the network 192.168.70.0/24. I would use this network as a fallback one. So I set the nat rule: object network NAToutside2 nat (inside,outside2) dynamic interface and the static route with a different metric route outside2 0.0.0.0 0.0.0.0 192.168.70.1 2 Clearly it doesn't work: when I disconnect the outside ethernet cable no workstation can connect to the Internet throught the outside2 network... What do I need more?

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• My iPhone, Macbook and Laptop won't connect to 192.168.1.*

  - by 1Rabbit

  Previously I could connect perfectly with my iphone to my web server on 192.168.1.* but since I got a MacBook, I now can't even connect my iphone to either of the computers. I can connect to the wifi hub on my iphone, I can connect to the wifi hub on all the computers including my phone. Neither of my computers nor my iphone 5 can communicate with each other. What has happened? I've tried number of different local web servers, even tried the osx web server, but my iphone just wont connect to any.

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• Wireless adapter won't enable

  - by user52141

  I bought a d-link dwa-125, plugged it in and windows recognized it right away and said everything was good to go. But there were no connection options. When I open up the network control panel and have it show me the adapters... the wireless adapter is greyed out and says it is disabled. So I tell it to enable. It says is it enabling, then says it is enabled... but the adapter stayed greyed out saying disabled. I am running 7 x64. I have reinstalled drivers, connected it via lan and had it update drivers.. same problem. It works just fine on any other computer in the house, just not this one.

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• Macbook not connecting to WIFI

  - by Model Reject

  I have been having this problem all week. My Macbook aluminium can't see my wifi network. I have changed the channel to one that isn't being used by neighbours and my iphone picks it up straight away. In other words, the router is fine. It's just the macbook can't see it. This is driving me nuts if anyone can help... My airport card details... Card Type: AirPort Extreme (0x14E4, 0x8D) Firmware Version: Broadcom BCM43xx 1.0 (5.10.131.36.1) Locale: ETSI Supported PHY Modes: 802.11 a/b/g/n Supported Channels: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 36, 40, 44, 48, 52, 56, 60, 64, 100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140 Wake On Wireless: Supported The funny thing is that is was intermitent on Saturday. I had to keep restarting router and it worked for about 5 minutes, now it doesn't connect or see it at all. Tried using kisMAC and it can't see network either. Thanks, C

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• Wireless won't connect at home but works elsewhere

  - by Jenni

  My laptop connects via a wire into the modem fine and it works without any problems but it wont connect to it wirelessly, when I've taken it out places it connects fine in wifi area's! Also my son has his Wii connected wirelessly to it from his room upstairs without any problems, so I'm not sure where the problem lies, it hasn't worked since we got the modem it did on our old one and phoning Sky is just a waste of time they dont seem to know either and I just keep getting passed round departments repeating myself!

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• What if any free video player for windows can I set a custom frame buffer for streaming over the wifi?

  - by user268883

  I currently use DAUM PLayer (Pot Player) but I have problems streaming video to my laptop unless it is plugged into the network. An easy fix (so I thought) would be to find a player were I could adjust the cache / buffer so say 5 mins+ is read to the local Hdrive and then played from there... I can not work out how to do this in any player I have VLC, MPCHC and DAUM installed. All I want to do is increase the file buffer so X amount of the networkfile is copied to the local drive and then played... so all stuttering is stopped? How do I do this?

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• How to use OpenVPN through a restrictive firewall?

  - by R.L. Stine

  I'm currently in the situation of attempting to setup OpenVPN on a personal VPS, for connection primarily through an overly restrictive firewall. All of the setups mentioned below work when used through a reasonably-firewalled connection. I have tried: OpenVPN running on the standard port OpenVPN running on port 443 (I start OpenVPN manually from the command line on the VPS and see that the server reports the connection being closed almost immediately, I assume this is a result of DPI on the firewall) STunnel running on port 443 to access OpenVPN and evade DPI. This is the most successful and allows a connection and internet access through the VPN for ~10-20 seconds, before the connection is forcibly closed. Is there anything else I can attempt?

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• Network-related icons suddenly removed

  - by Velcro

  Hello, On a fresh Windows 7 installation, I created some shortcuts icons to network shares on the Desktop. Without any warning, these icons are sometimes and randomly deleted from Desktop. I totally don't understand what it happens! They are not hidden, they just are simply deleted. This behavior occurs on one computer in my company. Others Windows 7 computers are not affected by that. And also it's the first time I encounter that. Do you have an idea about this problem? Thanks.

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• Any recommendations on a NAS for a home-super-user?

  - by marc_s

  Can anyone recommend a good NAS for use in a home-server environment? I would request at least 2, preferably 4 disks, and I am most interested in good to excellent throughput for file-server and backup purposes - don't need any of the fancy media-streaming or -sharing features, that's not of interest to me. For a 4 or more disk solution, support for the various RAID levels (0, 1, 1+0, 5) would be a plus - especially if supported in hardware (rather than just a software emulation). I just need a place to put my collection of data, ISO images, and so forth - and since several external disks (self-built and off-the-shelf) have failed so far, I'm looking into a more reliable solution. Marc

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• DNS issues on my iPhone

  - by mattalexx

  I'm trying to call up "https://m.google.com" on my iPhone on my home WiFi. It's saying Safari "cannot verify server identity" of m.google.com, then when I press Details, it refers to https://m.google.com as "mattserver". "mattserver" is the name of my development server, a Linux box on my home network. This stinks of DNS issues to me. Accessing the unsecure version of that URL ("http://m.google.com") gives me a blank page. What could be going on here? Is there a way to look at the logs of my router somehow?

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• IPv6 feature in Network Adaptor is Slowing Internet

  - by Teknophilia

  The past few days, my internet browsing has become very poor. It's not a matter of speed, as a speed test will give at least 15Mbps. It seems as if my laptop has a hard time actually connecting to the sites. I've found a possible culprit, but don't know why it would affect anything: Going to adapter settings and disabling ipv6, but leaving ipv4, my browsing is back to normal. Re-enabling ipv6 brings back the issue. This is strange though, because I have always had ipv6 enabled. Moreover, using sites to test ipv6 compatibility, I fail with ipv6 enabled on my adapter, and pass when it's disabled. Ideas about why this is happening, and how to fix it?

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• Only receiving one document at a time from new web server.

  - by Robert Kuykendall

  We're trying to move our internal ticketing system from a Microsoft Small Business Server in the server closet to a Rackspace Cloud Server. The install is Fedora 11 LAMP, and should be default out of the box, except for the vhosts appended to the bottom of the httpd.conf. The new server is suffering from crippling load times, and watching the page load in Firebug it's easy to see the problem occurring, but I can't figure out the cause. Here is the [old server] (http://rkuykendall.com/uploads/old.server.png). I was expecting something like this, but a little slower since it was no longer hosted locally. Instead, the [new server] (http://rkuykendall.com/uploads/new.server.png) appears to only serve one file at a time. Here's another example of this [staircase load time effect] (http://rkuykendall.com/uploads/staircase.png) and another very clear example of the [staircase effect] (http://rkuykendall.com/uploads/staircase2.png). I talked to some guys on Freenode #httpd with no luck. I created a duplicate server to play with, and also created a fresh server with Fedora Core 13 and moved over just the database and web files with no luck. Any suggestions? ( image links disabled due to n00b-spam-restrictions )

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