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  • Multicast in Ubuntu

    - by iwant2learn
    Can some one please explain the steps required to configure a multicast in Ubuntu? I have a simple program taken from Internet. I get errors when I execute the client program. I get the error as: Opening datagram socket....OK. Setting SO_REUSEADDR...OK. Binding datagram socket...OK. Adding multicast group error: No such device: When I execute the server program I get the error as: Opening the datagram socket...OK. Setting local interface error: Cannot assign requested address I am using Ubuntu to run the program. I have two different laptops but connected via the same network. I am using wireless network to perform the above operation.

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  • Question Virtual Network and NAT set-up

    - by Jay
    Hi Guys! I need some help. I'm completely new to Linux. I'm trying to set up the following scenario: +-----+eth0 +-----+ +---+ | VM2 |-----------| VM1 |---------------| H | +-----+ eth1 +-----+eth0 (NAT) +---+ VM2 - Virtual machine from Virtual Box, using Ubuntu VM1 - Virtual machine from Virtual Box, using Ubuntu: I want this to act as a NAT. H - Host, my Windows Vista The dots were just added since after saving the spaces disappear. So if I ping H from VM2, H would receive a different IP address from VM2. Could you give me a step by step on this? All machines are of course 32 bit. Thanks. Would appreciate the help so much.

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  • Ethernet Wired Connection Help

    - by user107598
    I have recently installed Ubuntu 12.10 onto my Dell Inspiron N5010 and Ive been all over many forums trying to figure out how I can get my ethernet cable to be recognized so I can set up a wired connection. My Network Card is the Realtek RT8139 and from what Ive gathered the ethernet port driver for it is installed. Whenever I run ifconfig in the terminal it says that eth1 is up and running but no matter how I edit the connection I cannot get it to work. If anyone can help it would be greatly appreciated!

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  • How do I set up a server for SSH?

    - by Rob S.
    At my workplace (a university) we have two Ubuntu servers. One is a teacher server and the other is a student server. I am currently setting up a new server to replace the existing teacher server. The new server is currently online and I am trying to get it setup so I can SSH into it from my home. Right now, I can SSH into the existing teacher or student server and then SSH into the new server. However, I can not SSH directly into the new server. What must I do so that I can SSH directly into the new server? Thank you very much in advance for your time.

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  • Computer becomes unreachable on lan after some time

    - by Ashfame
    I work on my laptop and ssh into my desktop. I use a lot of key based authentication for many servers for work but recently I couldn't login because ssh would pick up and try all the keys and it stops trying before ultimately falling back to password based login. So right now I am using this command: ssh -X -o PubkeyAuthentication=no [email protected] #deskto The issue is after sometime the desktop would just become unreachable from laptop. I won't be able to open its localhost through IP and today I tried ping'in it and found a weird thing. Instead of 192.168.1.4, it tries to ping 192.168.1.3 which I am sure is the root cause as it just can't reach 192.168.1.4 when its actually trying for 192.168.1.3 Ping command output: ashfame@ashfame-xps:~$ ping 192.168.1.4 PING 192.168.1.4 (192.168.1.4) 56(84) bytes of data. From 192.168.1.3 icmp_seq=1 Destination Host Unreachable From 192.168.1.3 icmp_seq=2 Destination Host Unreachable From 192.168.1.3 icmp_seq=3 Destination Host Unreachable From 192.168.1.3 icmp_seq=4 Destination Host Unreachable From 192.168.1.3 icmp_seq=5 Destination Host Unreachable From 192.168.1.3 icmp_seq=6 Destination Host Unreachable From 192.168.1.3 icmp_seq=7 Destination Host Unreachable From 192.168.1.3 icmp_seq=8 Destination Host Unreachable From 192.168.1.3 icmp_seq=9 Destination Host Unreachable ^C --- 192.168.1.4 ping statistics --- 10 packets transmitted, 0 received, +9 errors, 100% packet loss, time 9047ms pipe 3 Also the ping command message comes in multiple and not one by one. (izx answer's the weirdness I thought there was in ping command.) I did check for desktop, its local IP is still the same, so something is going on in my laptop. Any ideas? P.S. - Laptop runs Ubuntu 12.04 & Desktop runs Ubuntu 11.10 Laptop is connected through wifi to router and Desktop is connected through LAN to router. Update: Even after setting up static IP leases in router settings, I again ran into this issue.

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  • upgrade from 11.10 to 12.04 killed my network connectivity

    - by Daniel
    I have a wired network connection that worked fine in version 11.10. I upgraded to 12.04 and immediately after the upgrade was completed, the OS reported my "cable unplugged". It is not unplugged and it is not defective. I have a D-link DFE-530TXS 10/100 ethernet NIC and I see what seems to be the generic 10050 driver loaded. Is there any way to just flush anything and everything to do with the network configuration and have Ubuntu reset/find everything again? If not...is there any way I can get it to realize that my network cable is not unplugged? (considering it worked mere minutes before). Thanks.

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  • Network programming under windows: is WSA functions can be more complete than pSock functions [on hold]

    - by Kane
    I plan to make a set of classic socket functions to simplify their usages. Since i work under windows and linux indifferently i usually make it portable (it's not my first version of this set of functions), but i want to do something different this time and dedicate one version to windows, and one other to linux. With that i wonder for the windows version, if the WSA* functions can have any interest using them instead of the psock ones. I have found nothing about a comparison between them, so if any of you have any idea, suggestion, link or benchmark ?

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  • accessing files on a shared folder via IIS

    - by Darkcat Studios
    Im not sure if this suits stackexchange, serverfault or here... so i'll go with here for a start. I'm having issues setting up a network share to be accessed by IIS, all I need to do is read/write files on the Other server. We have 2 servers set up (Both 2008 R2 & IIS 7.5), one is the WEB server, which is externally accessible and NOT part of the domain. We also have an Intranet server which has no internet connectivity and is part of the domain. These 2 servers can talk to each other happily, I have the SQL server on the WEB server shared across to the intranet server so that the web content is editable from the intranet. I can share a folder on the web server (say, wwwroot/Images/) and connect to it from the intranet server, even have it as a mapped drive (but i know thats not going to work for IIS to access it), So there seems not to be a connectivity issue. I can also set up a Virtual folder in IIS on the Intranet server - this is where it gets annoying - I cant connect using pass-through authentication because there is no suitable user on the web server (which is not on the domain). If i set up a user on the web server, eg Intranet_USR, and give it appropriate rights to the folder, files and share, i can connect, but only view folder contents in IIS, not read, although that user has read privileges!! Any help much appreciated!

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  • How to set up router with DSL?

    - by NightwishFan
    I have a Verizon DSL connection. I am new to being the one who has to maintain the net. We have the Verizon modem and plugged into it is a belkin router. I did not alter the configuration on either of the devices. We get a net connection, though I have issues joining any form of online game. Some refuse to connect, others are slow. I have read that perhaps I need to use the modem in "bridge mode" to the wireless router? Would that fix my issues? Or do I just have to open ports or something similar. I really have no clue what could be the problem. Could someone advice me how to get this working with Ubuntu?

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  • Proxy authentication box not showing (sometimes)

    - by zerologiko
    I'm behind a proxy that require authentication by means of user/pass. I'm using Ubuntu 11.04, I think the proxy is "Squid". Usually everything works fine, that means that the browser shows me the window to insert proxy user/pass and I can navigate. The problem: Sometimes the browser refuse to show the authentication windows and if I wait enough it gives me an error like: Errore 130 (net::ERR_PROXY_CONNECTION_FAILED) Even if I restart, disconnect, the situation doesn't change. BUT on Windows the network (and the proxy) works.. So, bottomline what I know is: the network is working (though only on Windows) the Ubuntu configuration is ok (because i can navigate most days) The problems resolves itself in a few hours but I don't understand why. Some hints? Thanks in advance! Andrea

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  • How to rewrite a TCP MMOG server designed to run in a single machine, in a distributed way?

    - by Dokkat
    I have a MMOG server running on C++, using winsockets. My server won't support more than 200 players. I had the idea of redesigning it so it will use multiple servers instead of one, so, maybe, for example, each server could take care of a number of players, and, if it was too laggy, it could transfer the responsability of that player to other server. I'm not sure of how to program a consistent game logic like that, though. Are there techniques for this?

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  • Problems with NAT Adapater since upgrade to Ubuntu 12.10

    - by jjesse
    I was running Ubuntu 12.04 w/ VirtualBox installed. I was using the NAT interface to connect to everything. Basically running VBOX for testing some things and a Windows VM for Netflix.. Was back to working in my VMs today and noticed that I was unable to connect to the internet. In the VM settings I'm using the NAT adapter, however I noticed there is no NAT adapter in the Network Settings under Preferences in VBOX. Not quite sure what happened but wonder what is going on? I noticed there are some posts about changes DNSMASQ and configuring a bridge mode, but this worked out of the box under 12.04 and since the upgrade this no longers work. Need some help please

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  • Scuttlebutt Reconciliation from "Efficient Reconciliation and Flow Control for Anti-Entropy Protocols"

    - by Maus
    This question might be more suited to math.stackexchange.com, but here goes: Their Version Reconciliation takes two parts-- first the exchange of digests, and then an exchange of updates. I'll first paraphrase the paper's description of each step. To exchange digests, two peers send one another a set of pairs-- (peer, max_version) for each peer in the network, and then each one responds with a set of deltas. The deltas look like: (peer, key, value, version), for all tuples for which peer's state maps the key to the given value and version, and the version number is greater than the maximum version number peer has seen. This seems to require that each node remember the state of each other node, and the highest version number and ID each node has seen. Question Why must we iterate through all peers to exchange information between p and q?

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  • how to map a network drive [duplicate]

    - by acquacheta
    This question already has an answer here: Correct way of mounting a Windows share 1 answer I hope someone can help me.. I'm trying to connect with my university remote filestore, but I can't make it work.. Here is explained what to do on Windows or Mac, and here I found a guide about how to do it with ubuntu, but it's not working to me (at the end of all the steps, I can't access to the mounted folder). I can access to the storage through Konqueror (I'm using KDE), but I would like to access to it also without it. Any suggestion?

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  • Need a few reboots to connect to wireless

    - by Debajyoti Nandi
    I am running xubuntu 12.10 on my msi wind U100 netbook. I have a problem with the wireless connection. Whether the wireless connects automatically to a known wifi hotspot (both at home and starbucks) is temperamental. Sometimes I need to reboot one or more times to get it connected. Otherwise, it tries and keep asking me to enter the password (which is saved and when it works it does, so the problem is not with the password). Every time my computer awakes up from sleep the same problem. I have to do a reboot to connect to wireless. I searched everywhere but found no solution. I would greatly appreciate if someone has any solution. I will gladly share the hardware/software or config info, if asked, but I don't know exactly what to share and where to find them. Thanks you for any help.

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  • Cannot access windows share

    - by Wrigley
    I have an accounting program specifically tailored to the IT industry, its called Fincon (exe based). It basically works on a client to server directory base system. the server is currently running on a windows 7 machine with a NTFS partition. I have installed Wine. Have the shared Windows directory mounted with what I assume is the correct command for such being (mount -tsmbfs //servername/sharedir /mnt/fincon -0 usename=username,password=password). I can see the shared dir although it does take a bit long to access it on the Ubuntu machine via the mapped directory but instant via normal network browsing. I have also set up the mapped directory to my D: drive in Wine and have pointed the fincon.ini to read server field from D: directly. Here's my issue, it seems that for some odd reason I cant write to the mapped directory from Ubuntu, yet I can with my Windows machines, the permissions are set correct on the Windows 7 share and I really dunno what I'm missing. I'm quite a Linux noob just switched yesterday. Thanks guys for any help in this would be quite appreciated. As I'm pulling out my hair here and really want to migrate my work PCs to a Linux OS as it just gives less issues than Windows does ever.

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  • Printing Problem on Shared Printer

    - by paulus_almighty
    I'm using Ubuntu 11.10 on two machines. One has a USB printer connected. I want to share this printer with the other over the wireless network. Under Printing > Server > Settings: I have Publish shared printers connected to this system and Allow printing from the internet enabled. All other checkboxes are disabled. When I right click on the printer icon, I can see enabled and shared are ticked. On my other machine, I can now click on add network printer. It finds the machine name of the server and correctly identifies the printer. However, print test page fails. Under printer properties the printer state says: Processing - Unable to connect to printer; will retry in 30 seconds... What's gone wrong?

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  • Bluetooth broadcasting realtime - is it possible

    - by user69961
    Is it possible to broadcast data via bluetooth to one ore more connected devices? I mean that each phone will be master and slave at the same time and each phone will broadcast data that should be received by all other phones. Or is the only possibility to use a "client-server"-like topology; one phone acts as a server and listens to all clients and then sends data from each client to the rest of clients in the network? Which variant should be more effective? If broadcasting is possible then the same implementation can be used for all devices and if one device will die communication between rest of network can continue. And also will there be enough to send one message per device - not message from each device to server and then back to all devices. Am I right?

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  • Regulating outgoing traffic on ubuntu VM

    - by DazSlayer
    I am making a virtual network setup for my high school cybersecurity team to practice. I am connecting all the VMs together through a VPN and then people who are practicing will VPN in and ssh/remote desktop into the different VMs. The problem is that for practicing, they will need root access into the VMs and because the VMs are connecting to my personal network, the VMs pose a security risk to my personal network. Is there any way in either VMWare or VirtualBox or even making an unchangeable iptable (I can make all the windows VMs go thru a linux VM) to prevent people from connecting to my local network via the VM?

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  • Wifi works perfectly on Windows, but drops on Ubuntu

    - by alecRN
    I have a dual-boot computer with Windows XP on one partition and Ubuntu 10.10 on the other. In Windows XP I can connect to a hidden wireless network (WPA-PSK AES) perfectly, and I was finally able to install the driver for the adapter on Ubuntu (RNX-N180UBE, hardware id RTL8191SU). It works fine when I first boot the computer and log in, but then after a few minutes the network suddenly stops working completely. If I try to reconnect it, the network manager claims to have connected, but in actuality it's still down. At some points, I have been able to connect to a public network even while the private network didn't work, but that eventually wouldn't work at all either.

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  • How Does Windows Confirm Wi-Fi Access and Whether Hot Spot Authentication Is Necessary?

    - by Jason Fitzpatrick
    Windows is quite adept at telling you if you have a properly functioning Internet connection, but how exactly does it do so? Digging into how Windows handles the problem offers insight into Windows connectivity messages. Today’s Question & Answer session comes to us courtesy of SuperUser—a subdivision of Stack Exchange, a community-drive grouping of Q&A web sites. How to Fix a Stuck Pixel on an LCD Monitor How to Factory Reset Your Android Phone or Tablet When It Won’t Boot Our Geek Trivia App for Windows 8 is Now Available Everywhere

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  • Connection to openVPN Access Server

    - by Beig
    we are using an openVPN Access Server and I would like to connect to it via the VPN network setting (network-manager-openvpn). I downloaded the client.ovpn and I can connect to the server via the command line: openvpn --script-security 2 --config client.ovpn How can I add the connection to the network manager? Which (key) entry is which? User Cert, CA Cert, Private Key? Here is an example of the client.ovpn http://nopaste.info/c10ec207f2.html Thanks in advance.

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  • 12.04 drops Wired Network if Wireless connects

    - by mitt10tim
    This is a little different then most of the questions I have seen here. When I am at my office I keep my Lenovo Thinkpad t61p running Ubuntu 12.04 x64 connected via wired Ethernet. I also typically leave the wireless radios on. After a recent update the behavior of laptop in regards to the networks has changed. It used to be that if the laptop had a wired connection, the wired would supersede the wireless. Now, when I get to work and plug the laptop in and power it up, it connects via wired (correct behavior), shortly after the wireless begins searching for its favorite network (also correct) but as soon as it finds a network to connect to, I lose Internet. If I disconnect from the wireless network, leaving the wireless radios powered on, and refresh the wired connection, all is well again. Powering down the wireless radios also corrects the problem. How can I set this up so that the wired network (if available) always has precedence over the wireless?

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  • Lag compensation with networked 2D games

    - by Milo
    I want to make a 2D game that is basically a physics driven sandbox / activity game. There is something I really do not understand though. From research, it seems like updates from the server should only be about every 100ms. I can see how this works for a player since they can just concurrently simulate physics and do lag compensation through interpolation. What I do not understand is how this works for updates from other players. If clients only get notified of player positions every 100ms, I do not see how that works because a lot can happen in 100ms. The player could have changed direction twice or so in that time. I was wondering if anyone would have some insight on this issue. Basically how does this work for shooting and stuff like that? Thanks

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  • What are different ways to reduce latency between a server and a web application? [closed]

    - by jjoensuu
    this is a question about a web application that provides SOAP web services. For the sake of this question, this web app is hosted on a server SERVER B which is located in California. We have an automated, scheduled, process running on a server SERVER A, located in New York. This scheduled process is supposed to send SOAP messages to SERVER B every so often, but this process typically dies soon after starting. We have now been told by the vendor that reason why the process dies is because of the latency between SERVER A and SERVER B. The data traffic is routed through many diffent public networks. There is no dedicated line between SERVER A and SERVER B. As a result I have been asked to look into ways to reduce the latency between SERVER A and SERVER B. So I wanted to ask, what are the different ways to reduce latency in a situation like this? For example, would it help to switch from HTTPS to some other secure protocol? (the thought here is that perhaps some other alternative would require fewer handshakes than HTTPS). Or would a VPN help? If a VPN would reduce the latency, how would it do that? NOTE: I am not looking for an explicit answer that would work in my specific situation. I am more like looking just for a simple list of what technologies could be used for this. I will still have to evaluate the technologies and discuss them internally with others, so the list would just be a starting point. Here I am assuming that there exists very few ways to reduce latency between two servers that communicate across public networks using HTTPS. Feel free to correct me if this assumption is wrong and please ask if there is a need for specific information. NOTE 2: A list of technologies is a specific answer to the question I stated in the title. NOTE 3: Its rather dumb to close this question when it is after all about me looking for information and furthermore this information can clearly be useful for others. Anyway luckily there are other sites where I can ask around. StackExchange seems to attached to their own philosophical principles. Many thanks

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