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• How do I get the machine name from an IP via Multicast DNS?

  - by Adam

  I have a list of IP addresses on a network, and most of them support multicast DNS. I'd like to be able to resolve the server name instead of just having the IP address. ping computer.local 64 bytes from 192.168.0.52: icmp_seq=1 ttl=64 time=5.510 ms 64 bytes from 192.168.0.52: icmp_seq=2 ttl=64 time=5.396 ms 64 bytes from 192.168.0.52: icmp_seq=3 ttl=64 time=5.273 ms Works, but I'd like to be able to determine that name from the IP. Also the devices don't necessarily broadcast any services, but definitely do support mDNS broadcast. So looking through services won't work.

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• Problem with PPTP VPN and internet

  - by Enriquev

  Hello, I have an internet connection the following way : Internet Modem <- FireWall(not a router, a firewall) <- PC Everything is setup so my pc has an external ip address, and my firewall takes care of blocking bad stuff. I connect by VPN to an external network, so I added a new connection using Windows Xp's "New connection wizard" (the vpn client that comes with Windows XP), it's a PPTP connection so I used all default settings. I put the PPTP server's IP, my username and password and I succesfully connected. I was able to have access to the external VPN ressources. The only problem is everytime I connect to this VPN, my computer cannot connect to the web anymore, no msn, no ping, no web. Is there anything special I should be doing?

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• VirtualBox cloned Ubuntu Server network error

  - by Luke

  I run a number of virtual servers on my network and I want to be able to easily clone base installations of Ubuntu Server. I use the VBoxManage command to clone the actual hard disk and I then create a new profile for my VM and copy over the settings of the original VM. However, when I boot into the cloned VM, there seems to be a network problem. When I issue a PING I get the message "Network unreachable". I traced it down to the fact that the virtual network card of the cloned VM has a different MAC address then the original VM. When I copy the MAC address the clone seems to work fine. How can I have the cloned VM have it's own MAC address?

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• How to show what proxies/firewalls are enabled on Windows XP?

  - by Stephen Melrose

  Hi, I'm trying to fix a Windows XP PC that is having a strange problem. The computer can't seem to connect to the internet, even though an internet connection is present. The router and internet is working fine as I've connected a laptop to it via LAN and wireless and both worked fine. The PC in question is connected to the router as it has an IP from the DHCP. The problem is I can't connect to nor ping any internet address from the PC. I can't even connect to the router admin itself. I've tried both LAN ports in the PC, same problem and both. I'm assuming there's a proxy or firewall on the PC stopping the connections, I just don't know how to find them or see which one is causing the issue. So my question is how do I on Windows XP display the system proxy settings and/or any firewalls that are running? Cheers.

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• 32 bit programs can't access Internet in Windows 7 64 bit

  - by korona

  I recently got a new ASUS laptop with Windows 7 Home Premium pre-installed. It worked OK for a while but a couple of days ago, suddenly I couldn't access the Internet any more. After narrowing down the problem, I've reached the conclusion that what's happened is that 32 bit programs are suddenly not able to use the Internet, but 64 bit applications work just fine. Examples of programs that DON'T work any more: Google chrome Firefox Internet Explorer 8 World of Warcraft Examples of programs that DO work: Internet Explorer 8 (64 bit) ping (command line) nslookup (command line) ftp (command line) I'm pretty sure that those command line apps are 64 bit native. A re-install of Windows using the recovery partition on the laptop did fix the problem temporarily, but now it's back again. And I seem to be stuck between a rock and a hard place getting someone to take the responsibility for this; the vendor says to talk to ASUS, ASUS says it's a software issue, and Microsoft doesn't give support on OEM licenses... Does anyone know how to solve this issue?

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• Easiest way to move my Windows installation to an SSD?

  - by Jon Artus

  I've taken the plunge and bought an SSD and want to move my existing Windows installation over. The current hard disk is 500Gb, but I've trimmed the contents down to about ~40Gb. I'm transferring it across to a 100Gb SSD and looking for the easiest way just to copy everything across and set the SSD up as a boot device. I've looked at a few tools like Macrium Reflect, but they don't seem able to restore to a smaller drive. Do I need to go for something like PING to do this? I'm trying to avoid scary Linux-based boot utilities if possible, does anyone know of an easier way?

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• What can I do to configure my SSH such that it pauses for a flaky connection?

  - by kfmfe04

  I run ssh from OSX to a Ubuntu box - under home WIFI, everything works perfectly. However, when I ssh from certain external networks, ssh may be working fine for a minute or two and then drop due to a flaky network (diagnosed by pinging 8.8.8.8). How can I set up ssh so that it simply waits/pauses rather than drop (when dropping, I have to setup my development environment from scratch - a big hassle). EDIT When I say a bad connection, I mean, for example, ping 8.8.8.8 will work fine for a while, and then fail for 40-50 pings, and then come back on again.

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• Routing traffic to a specific NIC in Windows

  - by Stoicpoet

  I added a 10GB NIC to a SQL server which is connected over to a backend storage using ISCSI. I would like to force traffic going to a certain IP address/host to use the 10gb NIC, while all other traffic should continue to use the 1GB NIC. The 10gb nic is configured using a private network. So far I have added a entry in the host file to the host I want to go over the private network and when I ping the host, it does return the private IP, but I'm still finding traffic going to the 1gb pipe. How can I force all traffic to this host to use the 10gb interface? Would the best approach be a static route? 160.205.2.3 is the IP to the 1gb host, I actually want to the traffic to route over an interface assigned 172.31.3.2, which is also defined as Interface 22. That said, would this work? route add 160.205.2.3 mask 255.255.255.255 172.31.3.2 if 22

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• Installed IE8 & SP3 on XP now I can't HTTPS from any browser.

  - by Kevin

  The computer is Windows XP Professional SP3 with IE8. On the Tools Options Connections the "Settings" is GRAYED OUT (I am an admin on the machine) Any browsing of https:// addresses results in IE displaying the following: "this program cannot display the web page" After installing an alternate browser and trying the same https:// address I get a similar error message. I have tried using Compatibility View Settings to for all web pages and this has no effect on the problem. HTTP addresses work fine, I can PING sites such as google.com without issue. Question: What could be preventing me from getting at the settings to check to see if I'm using a proxy? What else could be preventing HTTPS access?

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• How do I get the machine name from an IP via Multicast DNS?

  - by Adam

  I have a list of IP addresses on a network, and most of them support multicast DNS. I'd like to be able to resolve the server name instead of just having the IP address. ping computer.local 64 bytes from 192.168.0.52: icmp_seq=1 ttl=64 time=5.510 ms 64 bytes from 192.168.0.52: icmp_seq=2 ttl=64 time=5.396 ms 64 bytes from 192.168.0.52: icmp_seq=3 ttl=64 time=5.273 ms Works, but I'd like to be able to determine that name from the IP. Also the devices don't necessarily broadcast any services, but definitely do support mDNS broadcast. So looking through services won't work.

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• Is Samba "remote browse sync" possible across OpenVPN tunnel?

  - by John Reynolds

  I'm connecting 2 TomatoUSB (Shibby build on WNR3500L v2) routers with an OpenVPN routed connection: ----------------------- ----------------------- | Router 1, subnet 20 | <--tunnel--> | Router 2, subnet 21 | ----------------------- ----------------------- Router 1 is the OpenVPN server and Router 2 is a client. Clients attached to the routers on both subnets can ping clients on the other subnet, so the tunnel and routing works. I've enabled file sharing on both, in order to get their Samba WINS servers running. Is it possible to get name resolution across the tunnel? I've tried remote browse sync = 192.168.21.1 in /etc/smb.conf on the server side, to no avail. Also tried using the IP adress that the client gets from the OpenVPN address pool (usually 10.8.0.something), but still no joy.

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• RSync over SSH hangs and fails with timeout

  - by tx2

  Client: Gentoo, GCC 4.3.4, RSync 3.0.9 Server: Ubuntu 10.04.4 LTS, RSync 3.0.7 Client and server connectet through is Internet, about 2Mbps. Ping is ok. RSync called on any files in any direction hangs on random file, then, after timeout, fails with: [sender] io timeout after 30 seconds -- exiting rsync error: timeout in data send/receive (code 30) at io.c(140) [sender=3.0.9] [sender] _exit_cleanup(code=30, file=io.c, line=140): about to call exit(30) In 1/10 trys is pass correctly. I've tryed to add SSH options TcpRcvBufPoll=yes, KeepAlive=yes; disable and enable rsync compression -- no changes. How can i make rsync works properly?

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• Name of my sql server instance from outside the network

  - by Michel

  Hi, normally i connect to my sql server instance from my local computer, and then the server name to connect to is the name of my laptop. So i can connect to server instance 'MichelLaptop' But now i'm trying to connect to my server from outside my network, and the first thing i wonder is: what is the name of the instance? i've made a redirect to my local machine in the DNS of my domain, so i said (this is not the real data) testsql.mydomain.com goes to 190.191.192.193 and when i ping testsql.mydomain.com, i get a response from 190.191.192.193 But what then is the server name?

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• dig gets the right result from DNS server, but name still fails to resolve

  - by EMiller

  Under what conditions would the following occur? From a given OSX machine on an internal network: $~ cat /etc/resolv.conf nameserver 10.102.120.7 nameserver 10.102.120.2 From the same machine: $~ dig @10.102.120.7 in.local <snip> ... ;; QUESTION SECTION: ;in.local. IN A ;; ANSWER SECTION: in.local. 43200 IN A 10.102.123.30 <snip> ... And yet, this workstation cannot ping in.local, nor load pages hosted by apache on that machine. 10.102.123.30 is definitley up (2 OSX machines I know fail to resolve in.local - but other machines on the network can). I have also checked their /etc/hosts to see if anything there might interfere... Not sure what else to check...

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• Windows Server 2008 is stuck at "configuring updates - stage 3 of 3 - 0% complete"

  - by Chris

  This has happened the last two times I've done updates to this system, and I really have no idea what is going on. It is installing a only a month's worth of updates. It only responds to ping and no services are up, so I can't view the system remotely (I have to hook up a monitor to see this message). In the past I've just restarted the system at this point and it eventually finishes updating. I want to know what I can do to avoid this situation, how to diagnose what is going on, and how to get any kind of remote access during the updates. Edit: I can start the machine in safe mode (where I did nothing but backup some files). I restarted and it no longer tries to do a windows update, just goes to the desktop where everything seems extremely broken. I can click on some things, but not launch most programs. I guess all I can do at this point is do a system restore or something.

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• RV042 - how to broadcast UDP through VPN

  - by user47221

  I setup a gateway to gateway vpn connection with linksys RV042 router. i was able to ping each other, access file sharing ( with netbios enabled ). They are having same subnet mask 255.255.255.0, 192.168.1.0 <--- 192.168.2.0 Firewall disabled. But when i created/host LAN games (eg. warcraft3), it cannot be detect by clients at another site/LAN. As i know warcraft3 is using UDP broadcast to tell the client the game is creaetd. 1. How to broadcast UDP to another LAN ? any things to do with multicast ?

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• Seeing DNS changes takes too long on my PC, can it be my router misconfiguration?

  - by Borek

  I administer a few sites and need to update their DNS entries from time to time, e.g., adding an A-record point certain subdomain to a certain IP. When I check sites like http://www.opendns.com/support/cache/, I can clearly see the DNS change taking effect throughout the world - is it just my PC that can't see this change (ping newsubdomain.example.org says it cannot resolve host name) The network "map" is like this: My PC -> my router -> my ISP's router -> internet On my PC, the DNS is set automatically which means that if I run iconfig /all, my router will be returned as the DNS server (192.168.1.1). On my router, the DNS is set to be what my ISP provided me with. Is this correct? What can I do to see new hostnames resolved quicker?

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• Remotely start VNC server on computer with no Admin password

  - by Joe M.

  I'm trying to remotely access a particular computer of mine and it seems that VNC has stopped. I can tell that the computer is still running because I can VNC into another machine on the same network and can see my target machine under the Network section in Windows Explorer and can also ping it succesfully. To summarize: I own the target computer I am currently too far to physically access it Remote Desktop Connection feature of Windows is not enabled The computer normally runs a VNC server, but it seems to have stopped The computer is definitely on and connected to the network The computer has no password on the Admin account I can VNC into other computers on the same LAN Given these conditions how can I get into the target to open VNC server, or even just reboot the target (VNC should open on startup)? I have tried PsExec and get "access is denied", and also tried "Connect to another computer.." from the Computer Management console and also get "access is denied".

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• Wireless slow, but very odd

  - by Logman

  I have a HP Pavilion dv6 laptop, internet through the wireless timeouts. Even though it connects fine to the AP/router. The computer had a virus (searchnu?) and I backed up the usual and restored the laptop to factory image. Problem is after the restore the internet through the wireless the same still... and connected via wired and everything worked fine. I was able to update the whole system. Internet worked perfect, speed great. But the wireless still was pitiful. Ping tests with wireless are interesting: Google= 18ms Gmail= 18ms Yahoo= 1023ms 8.8.8.8=30ms Microsoft= Request Timed Out Bing= Request Timed Out msn= Request Timed Out even though I get 18ms with google, the pages take a long time to load. Is this a root kit? is it the wireless card in the laptop?

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• Setting up virtual network in VMware workstation

  - by Saif Bechan

  I am playing around with VMware workstation and am trying to set up a small virtual network. I am having a little trouble with this I hope somebody can help me out. I want to have all the different virtual machines to have different internal IP adresses so I can ping them SSH etc, from within my windows machine. I am directly connected to the internet without a router, so using a bridged connection does not seem to work. The other options NAT and host-only do not seem to work also. I think i need to create a new adapter. I am testing this out with a virtual image of linux debain 5.0 lenny. I have WMware Workstation 7 with virtual network editor. Can anyone guide me in the right direction.

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• Linux server failover

  - by Lukasz

  I have two Linux servers (CentOS6) - both are identically configured connected to the same switch with a direct link between them. I only have one external IP that is assigned to eth0 on both servers (connected to the internet switch) with the interface shutdown on server 2. How can I failover to server 2 if server 1 dies - as stated they are linked directly so they can check for availability of each other via ping/tcp/udp. I toyed with Heartbeat but the documentation seems to be non-existent - not sure how to bring up an interface and start some services if the other server dies.

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• Intermittent timeout when connecting to Sql Server, what do I look for?

  - by Will

  Sql Server 2008 Standard 64bit on Windows Server 2008 R2 virtual machine hosted on a Hyper-V server. I'm getting intermittent timeouts when connecting to the server. This happens for both windows and Sql Authentication. May timeout every 2 out of 5 tries in different applications. When the connection times out, I can see (in Profiler) that no connection was made. Firewall is holey, server port is static (good ol' 1433). If I ping /t the server I get a steady connection that wavers between 1 and 2 ms. Any ideas what else to try would be appreciated, thanks.

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• centos 5.6, virtual on Vsphere

  - by Glasnhost

  suddenly my virtual centos server (5.6 on VMWare-VSphere) is not working... It started with the url not responding, nor the ip. (NO HTTP response, no ping). When I entered on the server via ssh to start troubleshooting I noticed that most of commands don't work anymore: top- machine hangs (it's not slow anyway) ps - machine hangs (funny enough apache server and web app are running and sending me emails) on some directory ls -l - machine hangs after first file, if ls l.txt the file show only the first file "more" command, also hangs on some file. So there are very little things I can try. I recovered my virtual machine from yesterday and before yesterday, and they show the same behaviour, it hangs on commands (but yesterday they were working). There is no firewall on the machine, there is on the host though. I can connect with ftp but I can't download files nor list directory apart the user top directory... Working hard right now, any idea appreciated

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• ssh can't connect after server ip changed

  - by Kery

  I have a server with ubuntu installed. After I change the network configuration and restart server, ssh client can't connect server any more. But in the server I can use ssh client to connect itself and the netstat command shows that sshd is listening port 22. And in my computer (win7) ping command is OK to server's new IP. The configuration in /etc/network/interfaces is: auto eth0 iface eth0 inet static address 10.80.x.x netmask 255.255.255.0 gateway 10.80.x.1 I'm very confused about this. Hope somebody can give me some idea. Thank you in advance!!!

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• Bad password when logging in via Remote Desktop

  - by Shiraz Bhaiji

  I have just setup a windows 2003 server running in hyper-V. When I log in via Hyper-V it works fine. When I try to login via remote desktop I get a bad user name or password error. I have: Disabled the firewall Enabled remote connections Before I did the above I did not get to the login screen. I can ping the ip address of the image. I am trying to login as Administrator. Anyone have an idea about how to fix this? Edit I have now managed to fix this by changing the password to something without special characters. Strange thing is the I could not see any problems with the passord, had tried typing it into the user name field to check it.

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