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• Superscope DHCP leases and configuration set up

  - by Vdub

  Hello I wanted to see if someone could help with a network problem I am having. Right now we have a super-scope and scopes of 192.168.50.1 and 192.168.51.1, as of now both are activated but only 192.168.50.1 is handing our leases, 192.168.51 wont. here is a summary of our network Gateway: watchguard firebox x750e for our router/gateway at 192.168.50.1 I set up as a secondary IP address 192.168.51.1 Server: Server 2008 r2 standard, running our DNS @ 192.168.50.242 and 8.8.8.8 as a secondary, AD, and DHCP. On that NIC card i have 192.168.50.242 as the IP address and 192.168.51.242 as a secondary. 192.168.50.1 as the default gateway and 192.168.51.1 as a secondary. Im am not very knowledgeable at this but as far as i have researched after adding a super scope and activating scopes, they should automatically start handing out addresses and I cant figure out why only one does. any help at all would be appreciated.

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• Connecting two servers together - How to?

  - by Chris

  Is it possible to connect two servers running for example Windows Server 2003/2008 together. For example they are seen on the network as one server with the combination of all HDD from each server? Example: \\Server1 - 1 x 1tb hdd \\Server2 - 1 x 1tb hdd I would like users of the network to be able to store their documents on both servers for load balancing. So basically a RAID between the two servers? Any help would be appreciated.

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• Too many Tunnel Adapter Interfaces

  - by Tomas Lycken

  If I open a command prompt on my machine and type ipconfig /all, I see lots of Tunnel adapter Local Area Connection* 9: Media state . . . . . . . . . . . . . : Media disconnected Connection-specific DNS Sufficx . . . : Description . . . . . . . . . . . . . : Microsoft 6to4 Adapter #5 Physical address. . . . . . . . . . . : 00-00-00-00-00-00-00-E0 DHCP Enabled. . . . . . . . . . . . . : No Autoconfiguration Enabled . . . . . . : Yes In fact, they're so many that my "real" adapters are pushed out of the stack, and can't be seen anymore. Is there any flag I can use on ipconfig to hide all virtual interfaces? Or is there some other way around this problem? Since they always say "Media disconnected" I suppose disabling could be an option, but if possible I'd rather not turn any functionality off. I just want to control what output I get from ipconfig. Also, I know these are related to IPv6 stuff. However, most of what I find on google merely states what these are, and that they're harmless - nothing about hiding/removing them.

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• Capabilities of business and SOHO routers

  - by Q8Y

  I'm currently studying for the CCNA certifications (especially for Cisco routers and configuration). I know that business routers provide more features than SOHO routers, the processing speed and RAM can be enough. Assume I need to connect a number of users through a network (accessing internet, share files, printers, ...). I have a high speed connection to the internet and I already applied QoS. How can I find out how many users such a single (SOHO) router could handle? In my case I'd attach to it multiple switches until I have the number of ports needed. Would everything work well and smoothly with 50 users? What about 300? At which point would I need a business router instead? If I implemented VLAN here, would it make any difference in the performance? When do I really need to use more than one router? (Both SOHO and business) I'm thinking that I may need them only if I want to increase the performance (instead of replacing the existing one) and if I have multiple locations, so in this situation I need to have multiple routers, right? Put differently: Is there is a need to have another router if my business all in one place?

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• Can I use two internet connections simultaneously in Windows 7?

  - by Chibueze Opata

  I have two internet connections - one via a 3G modem, and the other via wireless. The modem is faster so I normally browse with it, but it does not support torrent downloads while my wireless does. When the two are connected, my PC automatically makes every connection through the modem. Is there a way I can force a particular program, eg. uTorrent to browse through my wireless internet connection instead? Thanks.

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• What virtualization solution should I try next, after hitting problems w/ VMWare Player in dual-netw

  - by Alex R

  I have been using VMWare Player 2.5 for a while (Ubuntu guest on Vista host, 32-bit). VMWare had worked great until now but then I hit a brick wall: Due to some reorganization of my home network, the host machine now has to use a wireless connection to reach the Internet, while the printer, fileserver, and other important stuff are attached to a local gigabit hub. I have tried several tricks, such as editing the .vmx file, changing settings in vmnetcfg, etc, but I'm still unable to get the virtual Ubuntu box to connect each of the two virtual NICs to different networks (I did get it to recognize two NICs, but both DHCP'd onto the gigabit LAN). So, I'm ready to dump vmware for something with a little more low-level control of network settings. Virtualization is such a crowded space, I could spend months evaluating every product out there. I'm hoping for a shortcut... Can anyone recommend the best VM for my situation described above? Thanks

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• Wifi Works with Android and Windows 8 but not Linux and Win 7

  - by eramm

  Support has told me that our company wide wifi network is setup to support mobile phones only. However it doesn't make sense to me that they can identify a mobile device rather they have setup the Access Point to use a protocol that is only supported on Android and Windows phones. Because the Access Point supports Windows mobile this means that laptops running Windows 8 can also connect to the Access Point (proven). So it stands to reason that since Android is based on Linux there must be a way to connect using Linux as well. iwlist shows IEEE 802.11i/WPA2 Version 1 Group Cipher : TKIP Pairwise Ciphers (2) : TKIP CCMP Authentication Suites (1) : 802.1x WIreshark seems to show that a connection is being made to a website to get a certificate and use a Domain Controller for authentication. Questions: 1) what protocol could they be using that is supported on Win Mobile and Android but not on Win 7 and Linux (Debian) ? 2) what tools can I use to help me discover what protocol i need to support ? I have used iwlist and wireshark but I was not able to glean to much useful information from them. I can post the results if needed. 3) is there an app i can use on my Android phone to help me understand what kind of network it is connecting to ? I can provide more information if you tell me how to get it. I just don't know what I am looking for.

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• Connecting office to data center via Metro-ethernet

  - by Eric

  I am installing a metro ethernet link from my office to my data center. The office will have a cisco 3750 with several vlans. The data center end will have a more complicated set up. The metro e from the office will connect to a 2960, which will have two other 2960s with a few vlans and a 2811 router connected to it for connectivity to our other environments and the internet. I am looking at implementing this by connecting the office 3750 and the data center 2960 with a dot1q trunk and doing all routing at the 2811. I will configure subinterfaces for gateways for each of the vlans on the 2811. I work for a small company and don't have much of a budget for an ideal architecture. I can post a simple diagram if needed for clarification. Is there anything I am missing here? I feel like I am forgetting something very basic and want to make sure I eliminate any boneheaded mistakes.

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• AuthInfoRequired cups overwrites

  - by mooscape

  My problem is basically identical to the following: http://bbs.archlinux.org/viewtopic.php?id=61826 Put simply, I have a machine in ubuntu trying to connect to another ubuntu machine via a network in order to use the printer attached. There is no problem printing until I restart the guest machine. Immediately it overwrites the printers.conf file (under /etc/cups/printers.conf). It always adds the same line: AuthInfoRequired username,password I stop cups and change it to *#*AuthInfoRequired username,password to comment out the command. Start cups. Works great 'til the next shutdown. Then it gets overwritten again. Googling indicates it may be GTK problem and not CUPS, but I have found no permanent solution to date. Any suggestions appreciated ....

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• How can I send super large files directly to another computer in the Internet for free?

  - by Cruise

  I regulary need to transfer very large files (30 GB) to my friend - financial statistics. I don't have any problem with bandwidth: it is very broad here. I did some research in the area, so: 1. I would not use FTP, as it is very tricky to get it working behind a NAT. 2. I would not use Skype/MSN/ICQ, as it is not designed for file transfer and it underperforms on the huge files. 3. I would not use file-sharing services, as I need to pay for big files (30 GB is a problem here) and I don't like holding any piece of my data on the third-party server. So, I need some smart tool that will do what I need: sending files directly browser-to-browser and not browser-server-browser. Is it so complex? Is there some web application in the Internet that can do this?

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• No Drivers in Ubuntu 9.1!!!

  - by Chris

  I have a Lenovo G550 and I installed Ubuntu on it through Windows and I have no drivers. No sound, no wireless. I previously had installed it through Windows Vista with no problems at all. I now run Windows 7 and cannot seem to get it to function properly. I tried installing the recommended drivers to make sure the proper ones were installed and that still did nothing. Any one have ANY idea what could be happening? I just don't feel like dealing with it.

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• Ubuntu Connect Button Disabled, cannot connect

  - by CSharperWithJava

  I'm trying to connect to my school network from Ubuntu 12. The network is WPA encrypted and I can connect just fine if the network manager establishes a connection automatically. However, when I get disconnected and try to reconnect a username and password prompt pops up. The credentials are already stored and are autofilled in correctly, but the Connect button is disabled so I can't actually connect to the network. What can I do? The only guess I've found so far is the password is too short and Ubuntu is expecting a full WPA key. I don't administer the school network though so I certainly can't change that.

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• How do you document a network?

  - by Esteban Araya

  I'm not sure how to ask this question, since I'm not in the field. Say you're a network admin and you leave your job. How does the new guy know where to start?

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• Network with bridge and port forwarding?

  - by rafek

  Hi! Below is my current (and planned) home network configuration. I would like to connect my non-wifi-capable desktop to my home network. The question is: HOW? What device do I need? The primary requiremen is that I need to be able to forward ports to my desktop. How would I achieve this? Is there something like "double port forwarding"? Could anyone please explain this configuration to me? Thank you in advance!

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• Multiple WAPs: Bandwidth, Frequency Considerations

  - by Pete Cresswell

  The router in my LAN closet does 2 and 5 GHz. In the kitchen, I have a single-band 2 GHz WAP, and in the garden shed I have another single-band 2 GHz WAP. All are set to Bandwidth = 40 MHz, Wireless Network Mode = N-Only. The kitchen WAP and the LAN closet router both come up with multiple bars on my smart phone from almost anywhere in the house. The garden shed WAP will register one bar... but only sometimes. The Questions: Are these things in danger of butting heads? Should I re-set them to Bandwidth = 20 MHz? Bandwidth = Auto? Are there any tools that I could use on an Android smart phone, iPod, or WiFi-enabled laptop to make my own analysis?

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• ftp server over internet using different port

  - by ???? ????

  I want to make my ftp server over the internet i made it on Debian linux computer and i changed the port of it to 201 my local ip is 192.168.1.3 so i can access it from any computer on my network through ftp :// mylocalip:201 it appear to me the login page i login with my linux user and can see the files on my ftp server to make it public i make port mapping on my router for port 201 when i try ftp :// mypublicip:201 it give me the login page and when i entered the login data it is loading infinity without open my ftp server files when i made it over default port 21 it works fine. can any one tell me what is the problem here?

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• Proxy the traffic in http and https from my iPhone/iPad to VirtualBox on my Mac

  - by Nicolas BADIA

  I've got a mac running a Debian VirtualBox which forward the traffic from 8080 on the mac to 80 in the box and from 8443 to 443. The domains with the extension .dev are redirected on the mac to 127.0.0.1 with dnsmasq. The traffic on IP 127.0.0.1 is forwarded from 80 to 8080 and from 443 to 8443 using ipfw. So with this settings, my Debian VirtualBox gets all the traffic of my .dev domains in http or https. What I want is to be able to proxy the traffic of my .dev domains in http and https from my iPad to my Debian VirtualBox on the mac. I've try to setup an HTTP proxy on the ipad but I can only do it for one port (and it's not working with the port 443). Any idea on how I could achieve that ?

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• Can I create a virtual network interface to connect to a real network device?

  - by michelemarcon

  I have a networked windows pc with 2 network interfaces. The first connects to a lan with ip address 10.1.. The second connects to another lan with ip address 10.2.. Maybe it's a dumb question, however is it possible to virtualize the second network interface, so that the pc can connect to the 2 lans? If necessary, I may switch to linux or paravirtualization. CLARIFICATION: I want to send DHCP broadcast packets on the second lan, but not on the first lan. I want to do it with one single physical network interface. At the moment, I'm not using any virtualization software.

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• How to set which IP to use for a HTTP request?

  - by GetFree

  This is probably a silly question. I'm doing some http requests using wget from the command line, and I want those connections to be made through one specific IP of the 4 IPs my server has. Those http requests go to one specific range of IPs so I only want those to be routed differently. The 4 interfaces in my server are eth0, eth0:0, eth0:1, eth0:2. I tried with the following command: route add -net 192.164.10.0/24 dev eth0:0 But when I see the routing table it says: Destination Gateway Genmask Flags MSS Window irtt Iface 192.164.10.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 The interface is set to eth0 not eth0:0 as my command says. What am I doing wrong?

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• How to set static ip address on vmware for NAT guest vms from an ubuntu Host dhcp server?

  - by javadba

  I need to configure various linux flavor NAT'ed guest vm's to have static ip addresses provided by the Ubuntu host. The vmware documentation punts on this topic, deferring to "see the man pages for your linux distribution". But the generic pages for "my linux distro" do not know about the special stuff for vmware e.g. vmnet8. Pointers from someone who just knows how to do this would be much appreciated. Here is the /etc/vmware/vmnet8/dhcpd/dhcpd.conf: allow unknown-clients; default-lease-time 1800; # default is 30 minutes max-lease-time 7200; # default is 2 hours subnet 192.168.238.0 netmask 255.255.255.0 { range 192.168.238.128 192.168.238.254; option broadcast-address 192.168.238.255; option domain-name-servers 192.168.238.2; option domain-name localdomain; default-lease-time 1800; # default is 30 minutes max-lease-time 7200; # default is 2 hours option netbios-name-servers 192.168.238.2; option routers 192.168.238.2; } host vmnet8 { hardware ethernet 00:50:56:C0:00:08; fixed-address 192.168.238.1; option domain-name-servers 0.0.0.0; option domain-name ""; option routers 0.0.0.0; } Fromt the dhcpd.conf documentation, we are supposed to add an entry for static hosts similar to the following: host mystatichostonee { hardware ethernet 00:20:6B:C7:9B:E4; fixed-address 192.168.238.101; } host mystatichosttwo { hardware ethernet 00:23:7a:C7:9c:F2; fixed-address 192.168.238.102; } But notice that the vmnet8 entry in the vmware-generated dhcpd.conf already is set to fixed-address. I don't know how to add the specifics for my hosts to that vmnet8 entry: do they become nested?

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• wifi connection turns off oll the time

  - by er-v

  Hello! I realy need help with one strange problem. I have a wifi network in my appartment with wireless N home router Trendnet tew-652BRP. Everething work fine for three of my laptops, but I have one PC with D-Link DWA-140 adapter. It looses connection 2-3 times in 5 minutes. There is following messages in my system log when it does so: The browser has forced an election on network \Device\NetBT_Tcpip_{9537A5C1-3B43-4C56-B94C-CE69A257C3AD} because a master browser was stopped. The TCP/IP NetBIOS Helper service was successfully sent a stop control. The reason specified was: 0x40030011 [Operating System: Network Connectivity (Planned)] Comment: None The TCP/IP NetBIOS Helper service entered the stopped state. in order of appearence. How can I stop it? I have the latest driver installed.

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• Log and debug/decrypt an windows application's HTTPS traffic

  - by cweiske

  I've got a proprietary windows-only application that uses HTTPS to speak with a (also proprietary, undocumented) web service. To ultimately be able to use the web service's functionality on my linux machines, I want to reverse-engineer the web service API by analyzing the requests sent by the application. Now the question: How can I decrypt and log the HTTPS traffic? I know of several solutions which don't apply in my case: Fiddler is a man-in-the-middle HTTPS proxy which I cannot use since the application doesn't support proxies. Also, I do not (yet) know if it works with self-signed server certificates, which I doubt. Wireshark is able to decrypt SSL streams if you have the server's private certificate, which I don't have. any browser extension since the application is not a browser If I remember correctly, there have been some trojans that capture online banking information by hooking into/replacing the window's crypto API. Since the machine is mine, low level changes are possible. Maybe there is a non-trojan (white-hat) network log application out there which does the same? There is a blackhat presentation with some details available to read. They refer to Microsoft Research Detour for easy API hooking.

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• How to connect the virtual networks of vmware guests running on different hosts?

  - by gyrolf

  In a test setup, we are running several virtual machines on a single vmware workstation host. All virtual machines are connected via a "host only" network. This runs fine up to 2 or 3 virtual machines (depending on the host hardware). To allow more virtual machines, we want to use more host machines. Details about the environment and applications: Host PCs are running Windows XP in a corporate intranet. VMware used is Workstation 6.5 Guests are running Windows Server 2003 All guests act as Web Servers One of the guests additionally acts as Windows File server, offering shared folders for the other guests to connect to. Restrictions: VMware guests shall not be visible from the intranet. Changes to the host PC are restricted by corporate policy. In the virtual network, no domain controller exists. All virtual machines are member of the same workgroup. Running the virtual network as NAT is possible. Port forwarding might be used if it does not conflict with ports used by the host PC. Looking for a solution, I found hints about using router or vpn software on the hosts, but without any details how to setup. (I found a similar question Sharing the network between 2 VMware hosts, but the answer was not sufficient for me.)

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• Xen virtual host can reach some sites but not others

  - by Tun H S Lee

  Okay, this is killing me. Debian Squeeze, Xen 4.0, brand new install. No iptables rules whatsoever except for the ones added by the default xen bridge script. Dom0 can reach the entire world, no problems. DomU can receive packets from some hosts, but not from others. For instance, if I ping Host A, it works fine. If I ping Host B, the DomU reports 100% packet loss. The hosts are random, but consistent (even after reboots). I can see no pattern to why some work and others don't. In fact, in some cases, different virtual hosts on the same server (an other server at a different data center) are divided; some work and others do not. I can reboot (DomU or Dom0 too) and the same hosts will work or fail as before. If I tcpdump on the Host B while pinging from the DomU, everything looks fine. It sees the echo request coming in and says it's sending one back. However, if I tcpdump peth0 on the Dom0, it never sees the echo reply. Any ideas what could be happening? I'm tearing my hair out here.

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• Export/Import Windows XP wireless configs

  - by blunders

  About to rebuild my XP install and figured I'd see if there was a file or interface for collecting the configs for the built in Windows XP wireless manager. I've looked under the "advance settings" tab and within the properties GUI for each connection and I'm not seeing a way to export the configs. Clearly if I'm exporting these I'd like to be able to import or override the default config with the backup.

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