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  • Virtualization of desktop

    - by Agares
    Hi! I'm thinking about virtualization of my laptop(for educational purposes). My idea is to install very light host OS and have all the rest as virtual machines. Microsoft's Hyper-V Standalone would be very good solution, but it's impossible to access virtual machine from computer, where the Hyper-V is the host(isn't it?). So, which virtualization software would be good for me? I wanna have virtualized Windows 7(and maybe some other windowses). My processor support Intel Virtualization Technology.

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  • Why is this static routing not working ?

    - by geeko
    Greeting gurus, I'm trying to develop a DHCP enforcement extension like Microsoft NAP. My trick to block dynamic-IP requesting machines (that don't meet certain policy) is to strip the default gateway (no default gateway) stated in the IP lease and set the lease subnet mask to 255.255.255.255. Now I need the blocked machines to be able to reach some specific locations (IPs) on the network. To allow for this, I'm including some static routes in the lease. For example, I'm including 10.10.10.11 via router 10.10.10.254 (the one to which the blocked machine that needs to access 10.10.10.11 is connected). Unfortunately, as soon as I set the default gateway to nothing, blocked machines cannot reach any of the added static routes. I also tried classless static routes. Any ideas ? any one knows how MS NAP actually do it ? Geeko

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  • Keepalived takes several minutes to recover in a particular situation

    - by NathanE
    I've setup Keepalived for a master-slave style virtual IP and it seems to work well. Both are hosted in almost identical VMs. If I "pause" the VM that is running the Master. The Slave will take over, as expected, almost instantly. However if I then "unpause" the VM that runs the Master. The virtual IP will stop responding the pings. And it takes a good 4 or 5 minutes for it to start pinging again. It seems to be getting desynchronised due to the nature of the way I'm testing it (by pausing/unpausing the VMs). I admit that pausing and unpausing VMs is a slightly dodgy way to test this. But it has raised a concern for me that there could be other scenarios that cause the same undesirable behaviour. Is this expected / by design? Is there anything I can do to the config to improve it? Thanks.

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  • Sharing Internet Connection in Windows 7 is so much more frustrated than Windows XP

    - by Phuong Nguyen
    Back to the time of Windows XP, from Properties dialog of my Wireless Connection, I can enable sharing and then select LAN network from the Drop Down List and boom, I can share it with my friend. We just need a LAN cable (either cross or not-cross is OK) and his Laptop will get an auto IP to gain access to internet. But now with the new Windows 7, everything starts to suck. I cannot see the Drop Down List any more in the sharing panel and my friends Laptop cannot get an automatic IP anymore. Am I doing anything wrong over there? How can I gain back the peace I used to have with Windows XP?

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  • Virtualization deployment for datacenter

    - by bogha
    Hi, my company is going to deploy an IT Infrastructure on a virtual platform, can you please help me with the following: 1- which one do you recommend, Cisco Unified computing system ( cisco + emc + vmware )or HP Blades( virtualization solution + HP Storage )? 2- i Need to install a DNS Server, Web server, cpanel for managing hosting packages and Microsoft layer of product for usingg in the corporate infrastructur ( active directory, Local DNS, Exchange server, DHCP, Global catalog ) what is the minimum requirments for these servers ( in terms of CPU and Memory ) . 3- what is the best way to implement a redundant solution in a virtual environment. thank you

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  • What equipment do real ISP's use?

    - by Allanrbo
    In a dormitory of 550 residents, people often mistakenly set up DHCP servers for the whole network by plugging in their private Wi-Fi routers wrongly. Also recently, someone mistakenly configured their PC to a static IP being the same as that of the default gateway. We use cheap 3Com switches at the moment. I know that Cisco switches support DHCP snooping to solve the DHCP problem, but that still does not solve the default gateway IP takeover problem. What sort of switch equipment do real ISP's use so their customers cannot break the network for the other customers? What we ended up doing In case anyone are courious, we ended up doing seperate VLANs for each user. And as a matter of fact, not just the 550 users, but for 2500 users (11 dorms). Here's a page describing the setup: http://k-net.dk/technicalsetup/ (the section "Transparent firewall using VLANs"). There was no significant load on the router server as I feared in one of the comments below. Even at 800Mpbs.

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  • faking NAT with a VMware distributed switch across multiple hosts

    - by romant
    I need to construct a NAT for certain machines within the network. Wish to do this with dvSwitch - as it seems the logical way of attacking the problem as in this scenario there's just under 30 hosts. In order for the NAT'ed VM's to have access to the 'real' network. I am providing a 'router' VM, which will have access to the WAN/outside network, and also act as the DHCP server for the NAT'ed machines. Problem Space When the machines connected to the NAT interface and the router are on the same host, then they get an IP from the router VM, and work perfectly (routed outside). Unfortunately machines on other Hosts that are connected to the dvSwitch do not get an IP and further tcpdump shows no network data getting through across the hosts within the dvSwitch. Has anyone achieved a NAT solution using a dvSwitch before that they could share?! Thank you. EDIT: Including the diagram.

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  • Traffic shaping & monthly traffic limit in Tomato?

    - by Matt H
    Is there a way to do a monthly traffic limit in Tomato, DDWRT or OpenWRT in addition to the regular QoS? This is for a house with several students sharing the internet. I.e. for a specific IP address, IP Range or MAC address, the firmware will count the download traffic for that month. When a configurable limit is set, it'll either limit it to say 64kbit/s up/down or drop all traffic and maybe redirect web traffic to an internal web server telling them that they have exceeded their quota. How can this be done with those firmwares?

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  • Linksys EA3500 : use WAN port as WAN + LAN possible?

    - by Dough
    I'm waiting for deliver of a Linksys EA3500 router. I was wondering if it was possible to get the WAN port act as normal WAN port (Internet IP) + LAN switch ? My problem is that my Internet box is in a room with NAS and PC, and the router will be in another room with TV, PS3 and PC. The Internet box have a 4 port Gigabit switch so one cable will plug from there to the router's WAN in the other room. The router will get the Internet IP from the Internet box, but will it be possible to have private network through this link too ? I could have a first network between the Internet box and the router, and another network form router and devices but that will do double NAT for nothing... Thanks for reading me and your help !

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  • DELL DRAC & Ubuntu VPN Connection

    - by Mikunos
    I am trying to connect to a DELL DRAC card without success by Ubuntu VPN Connection Manager. I have these data: Protocol: PPTP SERVER IP PPTP: 1233.123.123.123 DRAC IP: 192.168.10.25 Subnet: 255.255.0.0 User: myuser Pass: mypass where have I to write these parameters? I have configured the PPTP connection using the graphical tool in Ubuntu 11.10 ... but in the /var/log/syslog I get these messages: Apr 15 11:33:15 shinet NetworkManager[1035]: <info> Starting VPN service 'pptp'... Apr 15 11:33:15 shinet NetworkManager[1035]: <info> VPN service 'pptp' started (org.freedesktop.NetworkManager.pptp), PID 18180 Apr 15 11:33:15 shinet NetworkManager[1035]: <info> VPN service 'pptp' appeared; activating connections Apr 15 11:33:15 shinet NetworkManager[1035]: <info> VPN plugin state changed: 3 Apr 15 11:33:15 shinet NetworkManager[1035]: <info> VPN connection 'Connessione VPN 1' (Connect) reply received. Apr 15 11:33:15 shinet pppd[18182]: Plugin /usr/lib/pppd/2.4.5/nm-pptp-pppd-plugin.so loaded. Apr 15 11:33:15 shinet pppd[18182]: pppd 2.4.5 started by root, uid 0 Apr 15 11:33:15 shinet pppd[18182]: Using interface ppp0 Apr 15 11:33:15 shinet pppd[18182]: Connect: ppp0 <--> /dev/pts/1 Apr 15 11:33:15 shinet NetworkManager[1035]: SCPlugin-Ifupdown: devices added (path: /sys/devices/virtual/net/ppp0, iface: ppp0) Apr 15 11:33:15 shinet NetworkManager[1035]: SCPlugin-Ifupdown: device added (path: /sys/devices/virtual/net/ppp0, iface: ppp0): no ifupdown configuration found. Apr 15 11:33:15 shinet pptp[18185]: nm-pptp-service-18180 log[main:pptp.c:314]: The synchronous pptp option is NOT activated Apr 15 11:33:46 shinet pppd[18182]: LCP: timeout sending Config-Requests Apr 15 11:33:46 shinet pppd[18182]: Connection terminated. Apr 15 11:33:46 shinet avahi-daemon[1081]: Withdrawing workstation service for ppp0. Apr 15 11:33:46 shinet NetworkManager[1035]: SCPlugin-Ifupdown: devices removed (path: /sys/devices/virtual/net/ppp0, iface: ppp0) Apr 15 11:33:46 shinet NetworkManager[1035]: <warn> VPN plugin failed: 1 Apr 15 11:33:46 shinet pppd[18182]: Modem hangup Apr 15 11:33:46 shinet NetworkManager[1035]: <warn> VPN plugin failed: 1 Apr 15 11:33:51 shinet pppd[18182]: Exit. Apr 15 11:33:51 shinet NetworkManager[1035]: <warn> VPN plugin failed: 1 Apr 15 11:33:51 shinet NetworkManager[1035]: <info> VPN plugin state changed: 6 Apr 15 11:33:51 shinet NetworkManager[1035]: <info> VPN plugin state change reason: 0 Apr 15 11:33:51 shinet NetworkManager[1035]: <warn> error disconnecting VPN: Could not process the request because no VPN connection was active. Apr 15 11:33:51 shinet NetworkManager[1035]: <info> Policy set 'Wired connection 1' (eth0) as default for IPv4 routing and DNS. Apr 15 11:33:57 shinet NetworkManager[1035]: <info> VPN service 'pptp' disappeared Thanks

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  • What is IPKVM and why would I need that to install SQL Server on my Web Server?

    - by Eric
    Hello. I have a dedicated server, and will be installing SQL Server. However, my hosting company said they can connect an external CD ROM drive and give me KVM over IP to install SQL Server. My question is, what is IPKVM, and how does it work? Do I need special hardware or software on my side to use it....or do I just connect via remote desktop? Also, why can't I remote into my server through remote desktop instead of using KVM over IP?

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  • UAE and the mysteries of unreachable websites

    - by 0plus1
    I write here because I'm really lost, please stay with me because it's not easy to explain. A company asked me to set-up a private server, now I'm a programmer so I got a solution with technical support and cpanel which helped me to setup everything and it's working smoothless. I'm by no means a professional sysadmin, but I have a fair knowledge of server configurations, but this problem is way over my knowledge, and apparently way over the knowledge of most sysadmins, I really hope that here I'll find someone with enough experience to help me or at least give me more insight. Now this company for which I'm consulting operates in the UAE (United Arab Emirates) and from there the server is almost unreachable. It started with ns not registering in the UAE, after a week that sorted itself out and now the site is indeed reachable, but it takes almost 2 minutes to load a webpage with one line of text. Emails go in timeout. The domain currently parked there has been bought appositely for tests, the main one that was supposed to go there, after a catastrophic week has been transferred to a shared hosting solution in the UK, and from there it works like a charme. Now after doing some research I discovered that I'm not alone in this, there are several reports of webmasters discovering that their website is not reachable inside the UAE, and mind this has nothing to do with the state-wide block of questionable sites, because in that case an error message appears, this seems to be related to the infrastructure of the UAE, which apparently reroutes everything through their own "fake" internet. Apparently new servers with their own IP are not recognized (yet?) by the UAE infrastructure, while shared hosting solutions seeing that they operates tons of other websites are more likely to be part of the UAE network. Now my questions are: 1) Has someone a real explanation for this? The only thing I can think of is that the server is on a new IP that is not yet recognized by the UAE, but that doesn't explain why it loads (even if after 2 minutes). I don't have any help from within the UAE as the only people that are "experts" are questionable companies that simply try to sell their own services. 2) If there is really some kind of block of new servers, is it possible to know before if a server is reachable from within the UAE, currently this is not a ns problem as even accessing the server with its IP result in a 2 minute wait. 3) Can it be that the problem lies somewhere else? There are some tests that I can perform? I'm not physically in the UAE, but I can ask the people there, or use teamviewer. Could it be some misconfiguration on the server (mind that the site works EVERYWHERE else in the world). Thank you for ANY kind of help

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  • cannot connect to MS FTP 7.5 on Windows 2008 on Amazon EC2 instance

    - by minerj
    I have just installed the MS FTP 7.5 upgrade on my Windows 2008 Server (Service Pack 2) running on an Amazon EC2 instance. In the FTP Firewall Support settings for the server in IIS Manager I have set up the passive port range 45001 - 45005 and also set the External Firewall IP address to match the assigned Amazon Elastic IP address. Using the AWS Console I changed the Security Group for the server to allow access to the server through ports 21 and 45001 through 45005. Using an FTP client (either the command line FTP client or Windows Explorer) on the Amazon server I can connect to the FTP server but I cannot connect with an external FTP client. When I checked to see which ports were open on the server using Shields Up it shows that port 21 is open but ports 45001 to 45005 are closed. I assume I'm missing something. Any help greatly appreciated.

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  • Cisco T1 Routing Help

    - by Joseph
    Thanks to someone on this site I was able to get the Serial0/0 interface up. I now have: DCD=up DSR=up DTR=up RTS=up CTS=up My next challenge seems to be in the routing and/or PC ip setup. This are the pertinent details from L3: WAN Network: 6.59.186.60/30 Level3 Side: 6.59.186.61 Customer Side: 6.59.186.62 Cust. LAN IPs: 6.59.192.224/27 What would be the IOS commands to setup this route correctly? Am I correct that I would the choose an IP like 6.59.192.224, subnet 255.0.0.0, gateway 6.59.186.62? Thanks

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  • How to make ssh/rsync/etc use a VLAN network interface?

    - by Annan
    A company I work for has a number of virtual servers with ElasticHosts. They are setup in such a way that eth1 is on a private VLAN connecting them to each other. This is so backups sent between servers are not charged at the same rate as external data transfer. My understanding of how VLANs and network interfaces work is sketchy at best. How can I make ssh, rsync, etc. transfer data through the VLAN? My final solution: I spent a while trying to figure this out, For all servers involved, edit /etc/sysconfig/network-scripts/ifcfg-eth1 DEVICE=eth1 BOOTPROTO=static ONBOOT=yes HWADDR=YOUR_MAC_ADDR IPADDR=192.168.0.100 NETMASK=255.255.255.0 Where HWADDR should already be set and the last octate of IPADDR should be different from each other. Then run, on all servers /etc/init.d/network restart After this the IP addresses specified by IPADDR can be used directly as any other IP address.

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  • How do http proxies determine https traffic with a single port?

    - by badunk
    If a proxy receives the tcp packet, then the destination ip address and port are that of the proxy. In that case, I imagine the only way a proxy can still resolve the intended destination is either through routing the source ip address/port or through the host field in the http header. Is this correct? In both Fiddler and Charles http proxies, I noticed that the tool accepts both http and https connections through a single port that you can specify. What do these tools do to tell the difference between the two types of connections?

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  • Windows Server Task Scheduler: Running scheduled executable fail-safe?

    - by Mikael Koskinen
    I have an executable which I've scheduled to run once in every five minutes (using Window's built-in Task Scheduler). It's crucial that this executable is run because it updates few time critical files. But how can I react if the virtual server running the executable goes down? At no point there shouldn't be more than 15 minutes break between the runs. As I'm using Windows Server and its Task Scheduler, I wonder is it possible to create some kind of a cluster which automatically handles the situation? The problem is that the server in question is running on Windows Azure and I don't think I can create actual clusters using the virtual machines. If the problem can be solved using a 3rd party tool, that's OK too. To generalize the question a little bit: How to make sure that an executable is run once in every 5 minutes, even if there might be server failures?

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  • Is SYN flooding still a threat?

    - by Rob
    Well recently I've been reading about different Denial of Service methods. One method that kind of stuck out was SYN flooding. I'm a member of some not-so-nice forums, and someone was selling a python script that would DoS a server using SYN packets with a spoofed IP address. However, if you sent a SYN packet to a server, with a spoofed IP address, the target server would return the SYN/ACK packet to the host that was spoofed. In which case, wouldn't the spoofed host return an RST packet, thus negating the 75 second long-wait, and ultimately failing in its attempt to DoS the server?

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  • forwardfor information is missing

    - by FAFA
    I use following configuration to load balance https connections, using haproxy 1.4.8. SSL offloading is done by apache. listen ssl_to_waf 192.168.101.54:443 mode tcp balance roundrobin option ssl-hello-chk server wafA 192.168.101.61:444 check listen ssl_from_waf 192.168.101.61:445 balance roundrobin option forwardfor server webA 192.168.101.46:80 check For HTTP requests this works great, requests are distributed to my Apache servers just fine. But for HTTPS request, I lose the "forwardfor" information. I need to save the client IP address. How can I use HAproxy to load balance across a number of SSL servers, allowing those servers to know the client's IP address?

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  • Cannot access SWITCH thru VPN

    - by MadBoy
    I've VPN connection set up that i connect to company with. I can connect to all devices (other switches, routers, servers from same subnet with same settings just diffrent ip) but I can't connect to NetGear Router GS748Tv3. Settings on switch: IP address 192.168.1.8 Subnet mask 255.255.255.0 Default gateway 192.168.1.1 Management VLAN ID: 0 (1 - 4094 or 0) (0 means all VLANs) Switch has 2 VLAN's configured 1 and 2. I can access this switch thru VPN if i log in to server and from server to switch but this is a little bit slower then normal way. Anything I'm missing?

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  • When connected through a router, a new gateway appears, and I lose my internet connection.

    - by idan315
    I have two computers connected to a router, connected to my ADSL modem by PPPoE. One of those computrs use Windows XP, the other uses Windows 7. The computer using Windows 7 keeps getting limited or no connectivity, and I can't use it to connect to the internet. Connecting the computer to the modem without the router 'in the way' worked, and I was able to use the internet - which led me to believe that the problem is with my router. However, I have changed my router, and the problem persists. (Just to be clear: the computer using Windows XP can connect to the internet without any problem). This entire question is about the PC using Windows 7. The only symptom of this problem is that when I see my network devices, in addition to my router (which appears as "Network 4", or something of the sort), I also see an "Unidentified Network". When using ipconfig to check the problem, I see a second gateway, with the IP 0.0.0.0, in addition to the IP of my router.

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  • SSH broken, segfault error 4

    - by trampi
    i cannot connect to my server via ssh, it throws me a "server unexpectedly closed connection" after entering the password. in var/log/messages the only noteable message is: Apr 14 17:41:23 s15410270 kernel: sshd[3602]: segfault at c0 ip 7f0801acbdb0 sp 7fff0adff860 error 4 in libc-2.8.so[7f0801a87000+14f000] Apr 14 17:41:29 s15410270 kernel: sshd[3606]: segfault at c0 ip 7f75f9463db0 sp 7fff027971f0 error 4 in libc-2.8.so[7f75f941f000+14f000] This message appears after a log in attempt via ssh or via sftp Its a SuSE Linux server. I'm looking for help where to start to search for the error, i can still act as root via a serial console. edit: "server unexpectedly closed connection" only appears if i enter the correct password!

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  • non-GUI connection to local Hyper-V VM without network

    - by sandro
    I have a virtual machine on Hyper-V manager (Windows 2008 R2) without a network configured on the VM. From a powershell script running on the host Windows server, I would like to query into the OS of that local VM for certain information (i.e. if a given process has finished completion). I am using codeplex's pshyperv module (https://pshyperv.codeplex.com/) to interact with Hyper-V manager, but the only cmdlet to connect to the vm is 'New-VMConnectSession', which launches a 'vmconnect.exe' connection to the VM. Since vmconnect.exe is essentially RDP, this is not very script-friendly. From within a host's powershell script, is there any way to send a command to a local virtual machine's OS and receive output, if no network is configured on the VM? (I believe Vmware's 'vmrun' utility has this capability) Another way to ask this question: Does Hyper-V have a non-GUI-based form of vmconnect.exe? (PS. Not sure if this was more stackoverflow or serverfault)

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  • Symantec CPS / Backup Exec 11D Service stuck in "Starting" Status

    - by user42289
    I have two Windows 2003 (one is SE, one is SBS) both SP2, both are Virtual Machines of Microsoft Virtual Server 2005 R2. All of a sudden about 2 weeks ago, the Symantec Backup Exec / CPS 11D stopped working on them. One is the Media server, one is our Exchange 2003 Server. There is another copy of CPS on our file server that the service is running fine on. However the one that is fine is not a VM. When I say stop working, the "backup exec continuous protection agent" service is stuck in "starting" status. On the non Exchange server I've tried uninstalling the last Windows Updates that were run some time around the time of failure. I've tried repairing the install of CPS. I've tried uninstalling it and reinstalling. Exact same problem in the end.

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  • Duplicate xserver

    - by hariks0
    When I start my ubuntu pc, just before my login, I receive a message that says "An xserver is already started in display :0. Would you like to try starting xserver in another virtual workspace?". Now If I answer 'No' the message appears again and again. If I say 'Yes' It goes to gnome desktop in virtual desktop 9 [Ctrl+Alt+F9] It was previously available only in [Ctrl+Alt+F7] but now available in both F7 and F9. Now I assume that there are two instances of xserver both in [Ctrl+Alt+F7] and [Ctrl+Alt+F9]. I think by killing one instance of xserver manaually I can disable the message. How do I do this? Thanks in advance.

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