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  • slow network in centos5 VM with centos5 host running KVM

    - by dan
    I setup KVM following the guide here: http://www.cyberciti.biz/faq/centos-rhel-linux-kvm-virtulization-tutorial/ I setup a bridged network and it worked fine except that the transfer speed is 200KB/s instead of the gigabit speed that I get on the host machine by itself. I tried editing the guest network settings to set "model=virtio" http://wiki.libvirt.org/page/Virtio but this just moves ifconfig-eth0 to ifconfig-eth0.bak in the VM and networking doesn't work at all. I tried moving ifconfig-eth0 back and starting up eth0, which works, but now the transfer speed is ~ 60KB/s I have no idea what else to try. Any suggestions would be greatly appreciated.

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  • Should a webserver in the DMZ be allowed to access MSSQL in the LAN?

    - by Allen
    This should be a very basic question and I tried to research it and couldn't find a solid answer. Say you have a web server in the DMZ and a MSSQL server in the LAN. IMO, and what I've always assumed to be correct, is that the web server in the DMZ should be able to access the MSSQL server in the LAN (maybe you'd have to open a port in the firewall, that'd be ok IMO). Our networking guys are now telling us that we can't have any access to the MSSQL server in the LAN from the DMZ. They say that anything in the DMZ should only be accessible FROM the LAN (and web), and that the DMZ should not have access TO the LAN, just as the web does not have access to the LAN. So my question is, who is right? Should the DMZ have access to/from the LAN? Or, should access to the LAN from the DMZ be strictly forbidden. All this assumes a typical DMZ configuration.

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  • Can't connect to a share.

    - by AngryHacker
    Hello, I have a laptop with a Windows XP Tablet Edition installed. I have several users setup on the laptop (mostly me and my kids). When I try to connect to its administrative share via \DadLaptop\c$ from a Windows 2000 Professional machine, it prompts me for a user name and password. However, after I enter it, it always tells me "incorrect password or unknown username". As a test I setup another share, called "test" and tried to connect to that. It worked fine, didn't even ask me for a password, just connected to it and that's that. All the networking is wireless. I am connecting with an admin account (admin on the target computer). What am I missing? Why can't I connect to an administrative share?

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  • What is Openflow?

    - by jmreicha
    Okay, I've been thinking about this a lot recently but I think I may be more confused now than I was originally when I started. I can't find anything about Openflow that helps me understand what it is. None of the websites I have found have given a solid definition of what Openflow really is and what it does, at least if they do I can't comprehend it. Is there an easy way to explain this standard so my small brain can understand it? I understand that Openflow is a way to abstract networking away from switches and can be managed from software, etc etc. I feel like it might be a little easier to grasp if I had exmaples of application. But so far searching has failed me. What is Openflow? How can it help me? What does it offer?

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  • slow network in centos5 VM with centos5 host running KVM

    - by dan
    I setup KVM following the guide here: http://www.cyberciti.biz/faq/centos-rhel-linux-kvm-virtulization-tutorial/ I setup a bridged network and it worked fine except that the transfer speed is 200KB/s instead of the gigabit speed that I get on the host machine by itself. I tried editing the guest network settings to set "model=virtio" http://wiki.libvirt.org/page/Virtio but this just moves ifconfig-eth0 to ifconfig-eth0.bak in the VM and networking doesn't work at all. I tried moving ifconfig-eth0 back and starting up eth0, which works, but now the transfer speed is ~ 60KB/s I have no idea what else to try. Any suggestions would be greatly appreciated.

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  • RDMA architecture - do you need adapters on both ends?

    - by Bobb
    I know Linux can use RDMA NICs like Solarflare... I just found Intel has something like that NetEffect cards. But Intel is talking all about clusters.. Can someone please explain. If I want low-latency networking and install RDMA NIC on my server. Is there limitation on where the cable can go? Is there a specific device expected on the other end? Is it special RDMA switch or RDMA adapter before switch or what? Why is this cluster talk? What if I want a single server with Windows (I can install HPC Windows or Windows 2008 R2)?

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  • Windows 7 Connection Sharing unable to access some sites

    - by Kristopher Ives
    I have a pretty sad networking situation that involves connecting to an open Wireless network and sharing that connection to an Ethernet that is plugged into a Linksys router. This has been done with XP and Windows 7, and it works great with XP. The problem with Windows 7 is that only some DNS will work. I don't know if it's been poisoned on the network above us (which we have no control over), but we've tried clearing the DNS cache as well as moving to using Google's DNS servers (8.8.8.8, 8.8.4.4). Here is a really quick list of sites that won't respond to DNS requests at all via dig, although if I get the IP address I can ping them: facebook.com yuilibrary.com twitter.com A lot of sites do work though. Anyone have an idea? It may be a subnet problem? If anyone wants more info let me know.

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  • Acer Aspire 7739G-6647 won't connect to the internet

    - by Nux
    Acer Aspire 7739G-6647, it belongs to a family member. I reinstalled the chipset, LAN drivers, ethernet controllers, etc. I'm positive it's not my router or modem or anything like that. I have other laptops running on the network, this one just has some strange issue. For some reason, it's saying "Work Offline" is enabled when I open Windows Media Player, and the PC seems to be connected to the network, but on the graphic in networking, it doesn't show the connection between the network and the internet. Could anyone try to state any possible reason for this issue? Any help is appreciated.

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  • Users Sound Off on Droid Android 2.1 Update Delay

    <b>Enterprise Mobile Today:</b> "The delayed Android 2.1 update for the Motorola Droid is starting to tarnish the successful launch of Verizon's first smartphone to run on Google's open source mobile operating system, according to posts at Motorola's Facebook page."

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  • per pixel based collision detection.

    - by pengume
    I was wondering if anyone had any ideas on how to get per pixel collision detection for the android. I saw that the andEngine has great collision detection on rotation as well but couldn't see where the actual detection happened per pixel. Also noticed a couple solutions for java, could these be replicated for use with the Android SDK? Maybe someone here has a clean piece of code I could look at to help understand what is going on with per pixel detection and also why when rotating it is a different process.

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  • What is Causing this IIS 7 Web Service Sporadic Connectivity Error?

    - by dpalau
    On sporadic occasions we receive the following error when attempting to call an .asmx web service from a .Net client application: "The underlying connection was closed: A connection that was expected to be kept alive was closed by the server. Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host." By sporadic I mean that it might occur zero, once every few days, or a half-dozen times a day for some users. It will never occur for the first web service call of a user. And the subsequent (usually the same) call will always work immediately after the failure. The failures happen across a variety of methods in the service and usually happens between 15-20 seconds (according to the log) from the time of the request. Looking in the IIS site log for the particular call will show one or the other of the following windows error codes: 121: The semaphore timeout period has elapsed. 1236: The network connection was aborted by the local system. Some additional environment details: Running on internal network web farm consisting of two servers running IIS7 on Windows Server 2008 OS. These problems did not occur when running in an older IIS6 web farm of three servers running on Windows Server 2003 (and we use a single IIS6/2003 instance for our development and staging environments with no issues). EDIT: Also, all of these server instances are VMWare virtual machines, not sure if that is a surprise anymore or not. The web service is a .Net 2.0/3.5 compiled .asmx web service that has its own application pool (.Net 2.0, integrated pipeline). Only has Windows Authentication enabled. We have another web service on the farm that uses the same physical path as the primary service, the only difference being that Basic Authentication is enabled. This is used for a portion of our ERP system. Have tried using the same and different application pool - no effect on the error. This site isn't hit as often as the primary site and has never had an error. As mentioned, the error will only happen when called from the .Net client - not from other applications. The client application is always creating a new web service object for each request and setting the service credentials to System.Net.CredentialCache.DefaultCredentials. The application is either deployed locally to a client or run in a Citrix server session. Those users running in Citrix doesn't seem to experience the issue, only locally deployed clients. The Citrix servers and the web farm are located in the same physical location and are located in the same IP range (10.67.xx.xx). Locally deployed clients experiencing the error are located elsewhere (10.105.xx.xx, 10.31.xx.xx). I've checked the OS logs to see if I can see any problems but nothing really sticks out. EDIT: Actually, I myself just ran into the error a little bit ago. I decided to check out the logs again and saw that there was a Security log entry of "Audit Failure" at the 'same' time (IIS log entry at 1:39:59, event log entry at 1:39:50). Not sure if this is a coincidence or not, I'll have to check out the logs of previous errors. I'm probably grasping for straws but the details: Log Name: Security Source: Microsoft-Windows-Security-Auditing Date: 7/8/2009 1:39:50 PM Event ID: 5159 Task Category: Filtering Platform Connection Level: Information Keywords: Audit Failure User: N/A Computer: is071019.<**.net Description: The Windows Filtering Platform has blocked a bind to a local port. Application Information: Process ID: 1260 Application Name: \device\harddiskvolume1\windows\system32\svchost.exe Network Information: Source Address: 0.0.0.0 Source Port: 54802 Protocol: 17 Filter Information: Filter Run-Time ID: 0 Layer Name: Resource Assignment Layer Run-Time ID: 36 I've also tried to use Failed Request Tracing in IIS7 but the service call never actually gets to where FRT can capture it (even though the failure is logged in the web service log). The network infrastructure group said they checked out the DNS and any NIC settings are correct so there is no 'flapping'. Everything pans out. I'm not sure that they checked out any domain controller servers though to see if that could be an issue. Any ideas? Or any other debugging strategies to get to the bottom of this? I'm just the developer in charge of the software and don't really have the knowledge on what to investigate from the networking side of things - although it does sound like a networking issue to me based on what is happening. Thanks in advance for any help.

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  • make vnc server listen on guest's ip address

    - by gucki
    My host system has the IP 192.168.0.250. Now I want to create a kvm guest using a tap device (so the network card of the guest just acts like a "real" one). The guest has a static ip 192.168.0.249 which it setups on his own (no dhcp). To connect to the guest using VNC I can to use the host's IP. So far everything works fine. Now I wonder how I can make the VNC server to listen on the guest's IP address, so I can use the guest's IP address to connect using my vnc client. Of course I cannot use -vnc 192.168.0.249:1 as this IP is not active on the host and so fails with Cannot assign requested address. Can this be done with tap networking at all? If not, how to get it working?

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  • Debian Lenny - network interfaces(eth) are in DOWN state

    - by pachanga
    Folks, I'm facing a very weird problem with one of my production servers(it's Debian Lenny) - after reboot network interfaces(eth0,eth1) are in DOWN state. Looks like an Intel based networking adapter is installed on the server, lspci lists it as follows: Ethernet controller: Intel Corporation Device 10c9 (rev 01) The kernel driver responsible for this adapter is "igb". I tried "modprobe -r igb && modprobe igb", network interfaces first disappear then appear, but they are in DOWN state again. What could go wrong? It used to be working just fine. How can this be fixed?

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  • Ultra Low Latency Linux Distribution or Kernel

    - by Zanlor
    I'd like to know if there are any linux distributions that are focused on low latency networking. The area I'm working in is algorithmic trading, and extremely low latency comms between machines is a must. The current h/w we're using is 10g ethernet, we're looking into things like infiniband RDMA and Voltaire VMA I've googled around, and have only been able to find tidbtits of kernel patches, command line options and hardware suggestions. I'm looking for a complete solution, specially built kernel, kernel bypass features, essentially all the goodies rolled up into one package - does such a thing even exist? I ask as a lot of this stuff seems to be a black art, people keep secret what they know works etc.

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  • Vmware sphere setting up external network

    - by Tom Beech
    I've just setup vmware vsphere 5 on a remote server (rented dedicated server). I've added my first VPS (centos 5.8) barebones. It's not finding any IP (internal or external) on boot. I've had an extra external IP assigned to my server that I wanted to use on the VPS. I tried editing the eth0 config and adding the IP in there and turning off the DHCP, but it can't find any IP or ping google or do any networking type things. How do I route the IP to my VPS so I can access it remotely?

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  • Why does NetworkManager take so long to connect to the wireless network?

    - by spoulson
    I have a Dell Mini9 that came with Ubuntu 8.10. Out of the box, Wifi configuration was done under System settings - Network and worked straightforward. Then, after some update patches, NetworkManager was installed to replace this functionality. Initially, it did not carry over my settings and I had to figure out how to redo it. After lots of bumbling with it, it finally works. However, after bootup the NetworkManager icon waits about 2 minutes before even attempting to connect to the wireless network. Then, about a minute later, it connects and I'm on my way. The Mini9 boots up within 30 seconds from SSD, so opening Firefox and then waiting 3+ min for wireless networking is a bit of a pain. Can anything be done?

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  • Why does NetworkManager take so long to connect to the wireless network?

    - by spoulson
    I have a Dell Mini9 that came with Ubuntu 8.10. Out of the box, Wifi configuration was done under System settings - Network and worked straightforward. Then, after some update patches, NetworkManager was installed to replace this functionality. Initially, it did not carry over my settings and I had to figure out how to redo it. After lots of bumbling with it, it finally works. However, after bootup the NetworkManager icon waits about 2 minutes before even attempting to connect to the wireless network. Then, about a minute later, it connects and I'm on my way. The Mini9 boots up within 30 seconds from SSD, so opening Firefox and then waiting 3+ min for wireless networking is a bit of a pain. Can anything be done?

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  • Microsoft Attacks Android in HTC Patent Deal

    Microsoft and HTC signed a patent deal involving HTC's mobile smartphones running the open source Android operating system....Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Policy Routing with Openvpn?

    - by sadawd
    Dear Everyone I am currently using openvpn for normal browsing. However, I have the following services running: a bit torrent client, a web server, IRC and a git server which I would really want it to not be using my vpn connection (and use my original connection instead). Is there a way to do this? I looked up policy routing and I can't really find any tutorial on how to do this on linux (I am on ubuntu). I don't want the solution to be incredibly complicated - I am pretty new to networking in ubuntu and I only want a very simple solution to this problem. Can someone help me out?

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  • how do web hosting companies host end users domain and give so many public IPs

    - by Registered User
    Hi, I am a Computer Science guy who understands networking very well. But when it comes to Web hosting companies I am clue less. I want to know how do web hosting companies give so many public IPs to so many users and each of them has root login also. How this is technically done that is what I am interested to know. I do not know how you people configure it. In my case if I have to do I will buy a public IP from some one and connect my server to it and at max give some people SSH access to it.In case of Web hosting companies how is it done.

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  • Why does eth0 show an IP if I'm booting into runlevel 1?

    - by banjer
    I'm having some issues with networking on a new Linux server I'm building. The OS is SLES 11. When booting into runlevel 1, I see that eth0 is showing an IP. Physically, there is a network cable plugged into the card associated with eth1, and then there is a network cable plugged into a QLogic iSCSI card (eth4, not shown). I've been troubleshooting this for awhile, and it seems like eth0 is somehow getting assigned an IP, even though it isn't configured in Linux or even plugged into the network for that matter. Thoughts? ifconfig -a Here is the ifconfig output (Sorry, I need more rep before I can post images on SF...)

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  • Cannot remove wireless network profile even though admin account is used

    - by David Karlsson
    On my windows computer which is connected to a company domain. I have problems with the wireless networking. First of all the computer fails to connect. Second of all I cannot remove the network from the list of wireless profiles. The properties window simply claims that "This network is administered by the Administartor Account". I am currently logged in as the local administrator. I have also tried creating a new admin account and still get the same problem when trying to remove the network. My computer has only the microsoft security essentials antivirus and some VMWare+virtual box connections that I can figure might interfere, but disabling realtime protection has not helped me on this. I also cannot delete the virtual network adapters from the control panel / network adapters...

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  • Freebsd or Linux? as BGP router over 100mbps

    - by Yucong Sun
    I am building a server to act as a BGP border router for my 100mbps uplink in ISP. I needs these feature: 1) Dual stack BGP peering/routing (at least 100Mbps, maybe more). 2) Potential full internet BGP feed. 3) Some basic ACL functionality. The hardware is L3426/8G ram. NIC will be on-board dual port Broadcom 5716. I've worked with Linux extensively before and it seems to be able to handle 100mbps, but I heard FreeBSD is faster on networking stuff. Which one should I use? And do we have some performance benchmark numbers out there? Cheers.

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