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• Windows Server 2008 repair logonui.exe

  - by Josh R

  I'm fairly certain some data on my server got corrupted and from a dialog box that popped up I think one of the things that got corrupted is logonui.exe I think this because while the server goes through BIOS and the windows loading splash screen, when it finished that it goes to a black screen with just a mouse cursor that I can move around. But most of the services come back up, for example: DNS, DHCP, DFS, and the print service all load up while it's sitting on the black screen. Is there anything I can do to repair the logon screen? Maybe copy a file off another copy of Server 2008, get something off the original media (which I have) or bring the system back to a previous restore point? Thanks! I'm in the weeds right now...

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• network issue ubuntu 8.04 in vmware esx

  - by hoberion

  ok, this is really pissing me off I have one ubuntu 8.04 instance running on vmware (esx) which decided after a reboot to stop resolving dns requests, I also cant connect to it using ssh although I can ping the server and its really that server (when I shutdown the server the ping also stops) stuff I tried: - reboot again :) - nslookup - serverip - setting networking to dhcp - offering some cute kittens to lucifer - removing the virtual nic and adding another (to get a different mac) - migrating the instance to another esx host - drinking 20 cups of espresso - stopped all services - running dnsmasq on another server and connecting to that dns - tcpdumping - disabling ip6 symptoms: cant resolve anything nslookup just says "no servers found..." although I can ping the servers traceroute to gateway doesnt work (even with traceroute -4 -n gatewayip) collegues laughing at me any thoughts

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• Google images sometimes terribly slow when using dnsmasq

  - by Joril

  Hi everyone! I am the admin of a small LAN of 10+ computers. I've set up a dnsmasq server for DHCP and DNS resolution, and it's working almost fine.. My problem is that when I try to use Google images, sometimes it takes ages to show the actual images. I get just the textual part of the page (menus and so on) while the images themselves are shown as the still-loading-white boxes.. When I use the DSL router directly as DNS, the site works fine all the time. The problem sometimes presents itself with Google maps too.. The map takes ages to load. Any idea on what I could try to troubleshoot this? (dnsmasq 2.47 on CentOS 5.2 64bit, our outside connection is an asymmetrical 4Mbps DSL)

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• Google images sometimes terribly slow when using dnsmasq

  - by Joril

  Hi everyone! I am the admin of a small LAN of 10+ computers. I've set up a dnsmasq server for DHCP and DNS resolution, and it's working almost fine.. My problem is that when I try to use Google images, sometimes it takes ages to show the actual images. I get just the textual part of the page (menus and so on) while the images themselves are shown as the still-loading-white boxes.. When I use the DSL router directly as DNS, the site works fine all the time. The problem sometimes presents itself with Google maps too.. The map takes ages to load. Any idea on what I could try to troubleshoot this? (dnsmasq 2.47 on CentOS 5.2 64bit, our outside connection is an asymmetrical 4Mbps DSL)

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• Ethernet interface number changed, and old one does not exist, but does not leave IP address

  - by Sagar

  I have a virtual machine with Mandriva 2007.0 (yes, old - unfortunately we do not have a choice here). Anyway, the problem: Before reboot: active network interface = eth0. No other interfaces present, and network manager confirms this. Static IP address set to 172.31.2.22. No issues, everything working properly, routing et al. -------Reboot--------- After reboot: active network interface = eth1, with a DHCP address. Network manager shows eth0 as disconnected, and not connectable. When I try to set eth1 up with the static IP address (same one), it says "In Use". I then tried ifconfig eth0 172.31.2.29 just to free it up from the eth0 interface so I could use it with eth1 (since this is connected). Result: ifconfig eth0 172.31.2.29 SIOCSIFADDR: No such device eth0: unknown interface: No such device Nothing else changed. Any ideas what could be happening, or at least how I can get my IP address back?

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• VM can’t connect to outside in bridged mode

  - by Kamal

  Hi Guys, I am not able to ping any machine(not even the host) from Guest VM in bridged mode. But I got an IP which is on the same subnet as host. I can ping my guest VM from the host and can use ssh to connect to the guest. I am using Vmware workstation 6.5. Guest VM is a centos VM and host is windows xp. Every thing works fine in NAT mode. Any clues as to what could be happening. I tried disabling all the firewalls I have. My virtual network editor shows that my ethernet adapter(the one my host uses) is used for bridging. It is connected. I don't understand how I can get an IP address from DHCP server. I can't ping any of the DNS servers in generated /etc/resolv.conf which are the same as that of my host

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• What is the difference betweeen "Network install" and "Network Boot" options in virt-manager when installing a new virtual machine

  - by Marwan

  From my understanding of PXE (Preboot Execution Environment), I know that there must be some negotiation first between the booting client and a DHCP server to obtain network parameters (IP address, etc) in order for the client to be able to fetch the boot loader and kernel image from the boot server. In other words, and aside from being a "virtual" machine, we're talking here about a "bare metal" machine, so there must be some "pre boot" mechanism for those negotiations to take place, and this is exactly what PXE is all about. When I think about the "Network install" option, I can't figure out how the new VM would be able to fetch the boot images (bootloader and kernel) without the previously mentioned mechanism. So, here is a short version of the question: When provisioning a new virtul machine, how do you expect the "Network install" option in virt-manager to work behind the scenes? Many thanks.

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• Always a path to the internet even in Windows SBS is off

  - by Mark

  Hello all, is it possible to have a configuration in a Windows 2003 SBS environment where in the event that the SBS box crashed/turned off/ or is being worked on that there can still exist a path to the internet for domain users and visitors to still use? I would like to have the standalone router issue DHCP IPs. The primary DNS would point to the SBS, the secondary wouuld point to the ISP DNS Server. My theory was that if someone was using the internet and the SBS box went down they wouldn't be able to access the network shares but still be able to use the internet. (We are moving everything into the clouds with Google Apps Non-Profit) Does this seem like a reasonable configuration? Or are they're pitfalls that I will fall into? Thanks Mark

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• Setting up a wireless access point with Ubuntu server

  - by Solignis

  I am trying to setup a wifi access point with my Ubuntu server, everything "seems" to be good since I got a better wifi radio (long story). But now I am a little confused, when my Android phone tries to associate with the AP it is able to with no problem but then it cannot get an IP address from my DHCP server. I have tried messing with firewall rules, nothing... I tried making a bridge interface as per what I am told I had to do. ( Not sure if i did it right though). What I am trying to do if make the wireless interface an extention of my eth0 network. Am I on the right track or am I going about the wrong way?

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• Static IPv6 address advertising and IPv6 autoconfig in Debian/Ubuntu

  - by Pascal

  I have a network that advertises IPv6 addresses through IPv6 autoconfig. To allow DNS lookups and to have fancy IP addresses, we setup "static" IPv6 addresses through /etc/network/interfaces: auto eth0 iface eth0 inet dhcp iface eth0 inet6 static address a:b:c:d:e::f netmask 64 Whenever we now connect through IPv6 Linux uses the IPv6 autoconfig address: a:b:c:d:21d:60ff:fe4a:479 and not the static IPv6 address: a:b:c:d:e::f A server on the other side only sees the autoconfig address. Is there a way to force linux (Debian/Ubuntu) to use the static address for outgoing packets? This is especially interesting for reverse DNS and firewall settings. I don't want to disable the IPv6 autoconfig since I don't have control over the settings the router advertises.

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• forwarding packets from wireless nic wlan0 to another Wireless nic wlan1

  - by user179759

  I have two wireless interfaces wlan0, wlan1 I want wlan0 to be connected to the internet via a wireless router and I want wlan1 to be in AP mode acting as a router to give internet access to whoever connectes to it. So basically all packets coming through wlan1 should be forwarded to wlan0 = Router = Internet. That's including DNS/DHCP/etc.. [A]~~~~~(Wi-Fi)~~~~~~v [B]~~~~~(Wi-Fi)~~~> [me] ~~~~(Wi-Fi)~~~~~>[AP/Router]------->[internet] [C]~~~~~(Wi-Fi)~~~~~~^ Any idea how can I do this? ps: I tried using bridges but I always get 'operation not supported' using the brctl tool.

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• Bridging VirtualBox over OpenVPN TAP adapter on Windows

  - by Sean Edwards

  I'm trying to configure a virtual machine (VirtualBox guest running Backtrack 4) with a bridged adapter over a VPN connection. The VPN is is hosted by the cybersecurity club at my university, and connects to a sandboxed LAN designed for penetration testing against various servers that the club has built. My host (Windows 7 Ultimate) connects to the VPN fine and is assigned an IP through DHCP, but for some reason the VM can't do the same thing, and I'm not sure why. It's like OpenVPN is filtering out packets from the MAC address it doesn't recognize. I want the virtual machine to bridge over the VPN connection, because our IT office has very strict policies about what you can and can't do on the network. I want to be able to run active attacks (ARP spoofing, nmap, Nessus scans) in the sandbox environment without risking the traffic accidentally going over the university network and getting my internet access revoked. Bridging over the VPN connection and running all attacks from inside the VM would solve that problem. Any idea why the host can use this interface, but the VM can't?

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• Juniper Networks SRX240 as a office router?

  - by Jordan Mendelson

  We're a small (7 person) fast growing startup who just got our new office and we're having a 100 Mbps line installed from Cogent. I'm not familiar with Juniper devices, however the equivalent Cisco appears to be rather expensive. Features we'd like: Offsite VPN access (PPTP or L2TP IPsec) - something Mac compatible IPv6 support NAT - ideally supporting multiple outside addresses mapped to VLANs DHCP DNS forwarding would be nice QoS to keep our SIP phones happy (managed through RingCentral) VLANs for guest/internal The device is going to be connected to a set of SIP phones as well as two Ruckus 7962s for wireless access. Eventually I'd like to connect it to a Juniper ESX switch as we grow. Would a Juniper SRX240 handle this ok?

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• How to bridge multiple wireless access points (and internet entry points) into one network

  - by amccormack

  I have two DSL lines coming in to wireless access points and then running to a RV082 Gateway/Bridge. The gateway then runs to a switch, which runs to multiple PCs and a Printer (See picture below). Normally, I would set up the wireless access points behind the gateway, but they are also the modems for the dsl. I have found that I can not print to the network printer if I am connected to the wireless network, but only if I am connected to the wired network. How can I configure the Gateway and APs (Routers) so that the PCs and Printer are all on the same internal network? I have tried turning DHCP off or redirect on the APs and redirect them to the Gateway. However, neither of these worked. Furthermore, I tried pinging the Gateway from the AP but got no response.

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• How to SSH to guest ubuntu OS in vmplayer4

  - by Grace

  I have installed vmplayer4.0.4 on Windows7, and install ubuntu12.04 as Guest OS. Basically i have two problems: Default vmplayer use NAT for network access. I could ping the guest OS from the Host OS. But how could i access the Guest OS from outside the Host OS? If i change to Bridged Mode, sure the Guest Ubuntu OS could get DHCP ip in the same subnet as Host OS. But i could not ping the Guest OS from the Host OS, or vice versa, even if i disable the iptables firewall on Ubuntu Guest OS like following: iptables -F iptables -X iptables -t nat -F iptables -t nat -X iptables -t mangle -F iptables -t mangle -X iptables -P INPUT ACCEPT iptables -P FORWARD ACCEPT iptables -P OUTPUT ACCEPT I could not figure it out, could anyone help on this issue? Thanks in advance.

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• Remotely push DNS server to client via OpenVPN

  - by wishi

  Hi! When I try to push a DNS server via the OpenVPN server-config I don't get that server to be the first DNS server on the connected client system. It ends up being specified as an alternative DNS server. push "dhcp-option DNS 89.238.75.146" # DNS-Server 1 (local djbdns) To overcome certain network restrictions, if they're at place, I use 443 TCP. - That means that my DNS queries are sent via TCP (if I manually reconfigure the DNS server), which doesn't scale very well from a performance perspective. Are there any kewl solutions for that? Marius

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• PXE boot very slow when PXE server is virtualbox

  - by sqrtsben

  As I read in questions here and on the Internet, PXE and Virtualbox don't seem to like each other too much. My problem is the following: I have a virtualized machine which hosts the DHCP and PXE server for 10 native clients. They are rebooted roughly every 10 mins and on each reboot, they need to boot a small linux (the initrd is ~4MB). Before, I had a native machine running and booting via PXE was very fast. Now, looking at the output of nload, I only get 500kbit/s whenever one machine is booting. The machines are connected via a GBit switch, so that can't be it. Also, when testing the connection speed to the outside, I have the full bandwidth available. Is VBox just unable to deal with large amounts of UDP packets? Can anyone point me in the right direction here?

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• configure pppoe on wrt54gl(openwrt)

  - by sunny

  Hi, I have home DSL connection from my ISP with a beetel modem at my end. I want to make my network wireless, so i bought a linksys wrt54gl and installed open-wrt on it. My ISP provides dynamic IP's with me connecting via pppoe. My question is how do I configure openwrt to work with this. Please suggest what option should I go with, or any other you recommend. DSL cable--Beetel Modem-- Wrt54gl in bridge mode with beetel modem doing the pppoe and having a DHCP server. DSL cable--Wrt54gl with wrt54gl handling the pppoe. Is option 2 possible, can I have a setup without bringing the beetel modem in the picture at all?

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• Two network cards in one Windows 7 PC

  - by Martin

  Hi, I've upgraded from Vista to Windows 7. On Vista I used to run one network card (Intel 82566DC -2 Gigabit) for my internet which was connected to a Dovado USB mobile broadband router connected to a 3G modem. The IP setup on the card is set on DHCP. The second card (3com Ethernet link) was used to connect to our town's local WUG (wireless user group) and all worked fine. Now the problem I have with Windows 7 is that when I connect to the internet with the (Intel) first card, the internet work fine but as soon as I connect the second card to the wug my internet drops. If I then disconnect the first card (internet one) and try to connect to the wug it works. It seems that the two cards are fighting each other. Is there maybe something I can do to fix the problem? As you probably can gather from this post is that I am not an expert on PC's so please if you do answer do I in simple terms. :) Thanks, Martin

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• XenServer: Editing clone configuration before boot

  - by Jeff Ferland

  Upon cloning a base image, I need to reconfigure basic settings. Regenerating the ssh host key, changing static IP assignments, setting the host name, etc. Because of the network setup, DHCP is not an option. That more or less rules out SSHing in with a predefined key or running a startup script since I can't provide the IP externally. I'd most like to mount the filesystem of the new machine on Dom0, but the lvm volumes are exported and it appears to be Bad Form to import them so the Dom0 machine can see them. What's your best suggestion for altering files in a cloned VM before boot? Must be non-interactive, and I'm going to guess out the gate that scripting access via xe console is not going to work well.

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• How to find the static ip address of my router?

  - by OSX NINJA

  I bricked my Linksys WRT54GS router when trying to change the firmware on it from dd-wrt to open-wrt. In order to unbrick it, I need to be able to do an ftp transfer to it. The problem is that it isn't using DHCP addressing and I can't just use the default ip address of 192.168.1.1. I have to use the ip address it was set at before it got bricked. The problem is I forgot what that number was. Is there some program or script that can find it out?

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• Kickstarting VMWare ESX 4.1 (Error: No NIC with name bootif)

  - by William

  I'm having an issue kickstarting an installation of VMWaare ESX Classic 4.1. I've stripped down my kickstart a bit to just: accepteula keyboard us auth clearpart --firstdisk --overwritevmfs url --url=10.16.0.1/cblr/ks_mirror/esx-classic-4.1.0-260247 rootpw --iscrypted $1$zZJa3g7g$mD8d.6QgbPku1QovQTAps/ timezone 'US/Pacific' network --addvmportgroup=true --device=vmnic0 --bootproto=dhcp part '/boot' --fstype=ext3 --size=1100 --onfirstdisk part 'none' --fstype=vmkcore --size=110 --onfirstdisk part 'datastore1' --fstype=vmfs3 --size=8920 --grow --onfirstdisk virtualdisk 'esxconsole' --size=7920 --onvmfs='datastore1' part 'swap' --fstype=swap --size=916 --onvirtualdisk='esxconsole' part '/var/log' --fstype=ext3 --size=2000 --onvirtualdisk='esxconsole' part '/' --fstype=ext3 --size=5000 --grow --onvirtualdisk='esxconsole' %post --interpreter=bash However, when I attempt to use this kickstart during a PXE install with no additional kernel options, I get the following error: There was a problem with the Network Device specified on the command line. Error: No NIC found with name bootif If I comment out the network line in the kickstart, the error changes to: There was a problem with the Network Device specified on the command line. Error: No NIC found with name eth0 How can I fix this? Thanks.

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• Cookies blocked by router?

  - by Martin wiboe

  Hello, My friend has a D-Link DI-524 router that she uses for her home broadband. It's a pretty vanilla setup with the standard firewall settings, DHCP enabled etc. However, recently she has experienced something strange - cookies are not working on every computer on her LAN, whether using FF3.5 or IE8. I tried viewing the HTTP traffic using Fiddler2, and the requests come through fine (mind you, Internet browsing still works flawlessly) but whenever a website tries to set a cookie using the "Set-Cookie:" header, my computer sees that line as "Set-*ookie:" with the cookie contents removed. I have never seen anything like this - do you have any idea? Regards, Martin

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• Mac Mini's internet very slow, every other device fine (PC, iPhone, Xbox 360)

  - by alex

  I recently haven't used my Mac Mini for about 5 days (however it was left on). I seem to be able to connect and get great download / upload speeds through my PC, Xbox 360, iPhone and parents' laptop. However, my Mac Mini is very slow. OS X's Mail.app is downloading mail at 0.4kbps and then dropping to 0. Skype file transfers are doing the same. Browsing the net is a terrible experience. It is taking 30 seconds or more to download basic pages. All of my devices connect wirelessly to a Netgear router / modem. I have tried giving the Mac Mini a manual IP, and renew DHCP lease, as well as flush DNS in Terminal. I have also rebooted the router / modem twice, and the Mac Mini twice. Do you know what could be causing this? Thanks

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• Cisco vlan entry missing in vlan.dat, but appears in running-config

  - by nLinked

  One of our vlan's (ID: 104) stopped working suddenly and computers on that vlan failed when trying to obtain a dhcp ip address. On the Cisco switch if we do show vlan, this command is supposed to shows the vlans in the vlan.dat file. We notice it has every other vlan except the one that is now missing. If we show the running-config or even the startup config, they DO show the missing vlan (as if everything is fine), but that vlan doesn't take effect. We tried deleting the "missing" vlan using clear vlan 104, but it says No subinterface configured for vLAN Identifier 104, so it's already missing. Recreating the vlan, saving and rebooting still doesn't add it into the vlan.dat or make the vlan work. The switch is in vtp server mode. Our startup config is here: http://pastebin.com/RHxxTG5p Any ideas appreciated.

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