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• diagnostic multicast issue using wireshark

  - by Abruzzo Forte e Gentile

  I have a network that is setup for multicast traffic. My setup is the following -Machine A : a server generates multicast traffic. -Machine A : few clients subscribing to that multicast traffic -Machine B : few clients subscribing to that multicast traffic # Address I am using IP : 239.193.0.21 PORT: 20401 The clients in machine A , even if they join the group (I can see IGMP messages through wireshark), don't receive any data while (and this is the funny part) machine B,C and D receive everything. I sorted that issue by completely disabling Linux firewall. Before doing that, I enabled the multicast on the firwall ('reject all'). iptables -A INPUT -m addrtype --src-type MULTICAST -j ACCEPT My question is the following: what I can check in wireshark that can help me in spot such firewall issues in the futures? For TCP/IP I realize by using ping and looking at ICMP packets rejected. What I can check/monitor for multicast? I am using LInux/Red-Hat Enterprise 6.2

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• Networking for RTS games with lockstep using UDP

  - by user782220

  Apparently from what I can gather Starcraft 2 moved to UDP in a patch. Now obviously with fps games there is no dispute that UDP is the only way to go. But with RTS games what benefits does UDP give over TCP given that the network model is lockstep? I suppose another way to phrase this is: what features of TCP make TCP inferior compared to UDP with resend, etc. implemented in the context of rts lockstep networking model?

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• XNA: Networking, what is a good bytes per second sent/received number

  - by SimpleRookie

  I am working with XNA networking, on the XBOX. I was wondering what is a safe number to stay under in the bytes sent and received when it comes to the xbox. Obviously various factors will effect the number, and you want as little packet data as possible to keep things smooth, but what is a good number for that? (Using : networksession.bytespersecondsent and networksession.bytespersecondreceived to measure the number.)

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• Installed Ubuntu on a Intel I5 3330 (over a dh 77eb motherboard), networking fails

  - by Siddharth

  To my surprise network fails after Ubuntu installs. modprobe e1000, did not get networking to kick off modprobe e1000e, too did not load Searched for the drivers on the intel site, no linux drivers listed. lspci reports 00:19.0 Ethernet controller [0200]: Intel Corporation Device [8086:1503] (rev 04) Any idea on how to proceed ? Is there a place where I can map driver names (like e1000, e1000e) with the model numbers ?

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• Bluetooth Dial-Up Networking using Blueman

  - by leemes

  I want to configure a dial up network connection via bluetooth to my phone in order to access the internet. I use Lubuntu 12.04 (Ubuntu with LXDE) which has the Network Manager Applet and Blueman applet installed. I guess these are the same tools than on an Ubuntu installation, hence I ask my question on this site. My phone is a Sony Ericsson W810i, my laptop is a Lenovo S10-2, my mobile phone provider is o2 Germany. I scanned for my mobile phone using the Blueman applet. I connected the dial-up network via the context menu - Serial Ports - Dial-up Networking. A notification bubble says that the connection is available on the interface named ppp0. ipconfig is telling something different: There is no ppp0 or something similar. I only see my eth0 (wired ethernet), eth1 (wifi) and lo interfaces. Of course, I can't ping google.com as the interface really seems to be not present at all. When the dial-up network is being connected, my mobile phone says that it connects to the internet. Afterwards, I see the active connection on the phone's screen. When successfully connecting with the phone using another computer, it behaves exactly the same, so I guess that the phone isn't the problem. I don't know if I configured the Dial-Up correctly. I use the phone number *99# which is very common on most mobile ISPs. I use the APN which my ISP is telling me to use. (I can't find the number on their support page, so I just use the default value *99#.) My mobile ISP is o2 Germany. There are How-Tos out there which use the Network Manager Applet to setup a bluetooth dial-up connection, but I can't see any bluetooth devices in the context menu as on the screenshots in those How-Tos. Do you have any suggestions what might be wrong / what I should try? EDIT: When choosing "Network Access Point" in the device's context menu instead of Serial Ports - Dial-Up Networking, an interface bnep0 appears. However, neither an IPv4 address is assigned for that interface (but IPv6), nor the phone connects to the internet. Am I missing something? Can I connect to the internet after setting up this network connection?

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• Box2D networking

  - by spacevillain

  I am trying to make a simple sync between two box2d rooms, where you can drag boxes using the mouse. So every time player clicks (and holds the mousedown) a box, I try send joint parameters to server, and server sends them to other clients. When mouseup occurs, I send command to delete joint. The problem is that sync breaks too often. Is my way radically wrong, or it just needs some tweaks? http://www.youtube.com/watch?v=eTN2Gwj6_Lc Source code https://github.com/agentcooper/Box2d-networking

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• Setting up a linux switch

  - by Shahmir Javaid

  I have a C++ Program to sniff each and every packet that crosses my linux box. However i need to now get my linux box to listen to every traffic in my network. I could buy a managed switch and set up port spanning, but i aint paying 200+ £'s for a switch and plus gives me a chance to learn. My Network +---------Computer A | Internet-----Router------Switch-------------+---------Linux Box | +---------Computer B Proposed Network +---------Computer A | Internet-----Router------Linux Box--------Switch eth0^ ^eth1 | +---------Computer B How would i setup this in linux. Do i just configure both the ethernet on different IP Address on the same network. Or am i completelly on the wrong track My System Fedora 13. Thanks

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• Multiple Internet connections, multiple networks and split access in Linux

  - by Swapneel Patnekar

  I am having trouble setting up multiple internet connections for split access in Linux. We have 3 internet connections from 3 different ISP's. We want to configure our Linux gateway machine such that our three internal networks 10.2.1.0/24, 192.168.20.0/24 & 192.168.2.0/24 use ISP1, ISP2 and ISP3 respectively in a split access manner. Outlined below is the layout/settings, Interfaces of the Linux Gateway connected to Routers: eth0: 10.1.1.2<---------->10.1.1.1(Internal Interface of ADSL Router)[ISP1] eth1: 192.168.15.2<------>192.168.15.1(Internal Interface of 3G Router)[ISP2] eth3: 192.168.1.2<------->192.168.1.1(Internal Interface of ADSL Router)[ISP3] Kindly note that none of the interfaces in the Linux gateway has a public static IP address. Routers of ISP1 and ISP2 get assigned a dynamic public IP address when connected to the Internet, router of ISP3 has been assigned a public static IP address. Interface of Linux gateway connected to a switch, eth4: 10.2.1.1(LAN Interface for ISP1) eth4:0 192.168.20.1(LAN interface for ISP2) eth4:1 192.168.2.1(LAN Interface for ISP3) eth4:0 & eth4:1 are virtual interfaces with eth4 being the interface connected physically. Based on http://linux-ip.net/html/adv-multi-internet.html I've set the following routes, ip route flush table 4 ip route show table main | grep -Ev ^default | while read ROUTE ; do ip route add table 4 $ROUTE done ip route add table 4 default via 192.168.15.1 ip rule add fwmark 4 table 4 ip route flush cache Additionally, using the following iptables rules to mark & route packets as per the guide mentioned above : http://pastebin.com/KzWHFGJA At this point, computers from 192.168.2.0/24 network are successfully able to reach the Internet through ISP3. 192.168.20.0/24 and 10.2.1.0/24 are unable to access the Internet through ISP1 and ISP2 respectively. Any inputs will be much appreciated !

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• Connect devices plugged into Raspberry Pi ethernet to WiFi network

  - by Tom

  I'm just starting out on a mission to learn more about networking and I've followed a tutorial (http://raspberrypihq.com/how-to-turn-a-raspberry-pi-into-a-wifi-router/) to turn my Raspberry Pi into a wifi router. That worked really well so I modified it slightly so that I can use a tethered iphone for the internet connection - I just switched all "eth0" references to "eth1" (the iphone interface) and added a script to set everything up when the phone is plugged in. This setup has freed up the Pi's ethernet port so I'd like to try and take this a step further and allow devices plugged into it to connect to the network. If possible, I'd like to try adding a switch so I can connect multiple devices. I've tried fiddling around with nat & iptables with no luck so my question is, how can I connect devices on eth0 to my wlan network?

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• Laptop kicks other users off the wifi when it connects, then gets disconnected itself

  - by Devon

  I've got an Acer Aspire One running Linux. When I connect to my building's wifi, everything seems fine for a short period of time (I can google a few things or start downloading an Apt package), but then other devices on the network lose their IP addresses. Shortly after that, my computer also gets disconected. My computer is set to use DHCP. What causes this, and do you know how it could be fixed? Am I causing a broadcast storm?

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• Why does pinging a local router return "Destination Host Unreachable"?

  - by Matt H

  I have two tomato routers. One is bridged wirelessly with the other. I have a new server on the network. It's running Ubuntu Server 11.04. They are all connected like this: A - Linux PC B - New Server C - Mac Mini D - Macbook T1 - Tomato 1 T2 - Tomato 2 They are connected like so: A -----+-T1 ==== wireless bridge ==== T2----- ADSL modem | | C & D Connected wirelessly to T2 B -----+ A, C & D do not experience any issues. I have an active SSH session to B from A and it's not experiencing any loss. B, the new server occasionally cannot ping T2 and therefore cannot connect to the internet. However, A can always contact B and B can ping A and B When the network is lost, B can still ping T1, but not T2 yet at the same as B has lost connection to T2, A can still ping T2. Any ideas on what this could be? there is nothing that gives any clues in any of the logs on either router or the linux server. One thing that is interesting is that I set up a ping running between B and T2. T2 has the IP address 192.68.1.1 Here is what I am seeing: From 192.168.1.1 icmp_seq=26 Destination Host Unreachable From 192.168.1.1 icmp_seq=27 Destination Host Unreachable From 192.168.1.1 icmp_seq=28 Destination Host Unreachable From 192.168.1.1 icmp_seq=29 Destination Host Unreachable From 192.168.1.1 icmp_seq=30 Destination Host Unreachable From 192.168.1.1 icmp_seq=31 Destination Host Unreachable From 192.168.1.1 icmp_seq=33 Destination Host Unreachable From 192.168.1.1 icmp_seq=34 Destination Host Unreachable From 192.168.1.1 icmp_seq=35 Destination Host Unreachable 64 bytes from 192.168.1.1: icmp_req=36 ttl=63 time=3.40 ms 64 bytes from 192.168.1.1: icmp_req=37 ttl=63 time=5.70 ms 64 bytes from 192.168.1.1: icmp_req=38 ttl=63 time=2.25 ms 64 bytes from 192.168.1.1: icmp_req=39 ttl=63 time=2.18 ms 64 bytes from 192.168.1.1: icmp_req=40 ttl=63 time=3.12 ms 64 bytes from 192.168.1.1: icmp_req=41 ttl=63 time=2.15 ms 64 bytes from 192.168.1.1: icmp_req=42 ttl=63 time=1.97 ms 64 bytes from 192.168.1.1: icmp_req=43 ttl=63 time= And it cycles to being reachable and not. So I guess you could say the question is, why is the router responding that it cannot be reached?

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• Losing connection to server from several computers

  - by user3696358

  I have a PostgreSQL server running Oracle Linux. In my network I have several workstations each running different OS (Fedora, Ubuntu, Windows). Every once in a while I lose connection from the several workstations to the server while other workstations can connect with no problem. If I do service network restart from the server the problem is solved and everyone can work until the next time it returns. Any clues? Thank you, Ben.

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• Static Network configuration with bridge in CentOS 6.2

  - by Kyle

  I have a server with CentOS 6.2 installed, I want to use it as a VM host to run some windows installations for development purposes. I wanted to be able to directly RDP and serve websites from IIS on these windows server installations, so I figured I would set it up as bridged networking. I have been struggling with this all morning, usually the result being that when I brought up the bridge interface all network connectivity to the CentOS would go away, however, I think I finally have that all figured out. However, here's what happens. The eth0 and br0 interfaces are defined in /etc/sysconfig/network-scripts with ifcfg-eth0 and ifcfg-br0. I DO NOT have ifup or ifdown or any other files for these interfaces, I have not found if they are needed. I can login and use firefox to browse the web, however, running ifconfig reveals that my eth0 does not have an IPAddress, but the br0 does. I can actually RDP into the Windows installation, and browse the internet from there as well, but I cannot directly connect(via putty, vnc, nor viewing web pages) to the CentOS box. Any idea what's up? ifcfg-eth0 DEVICE=eth0 BOOTPROTO=none IPADDR=192.168.1.20 GATEWAY=192.168.1.1 NETMASK=255.255.255.0 NETWORK=192.168.1.0 ONBOOT=yes BRIDGE=br0 ifcfg-br0 DEVICE=br0 TYPE=Bridge BOOTPROTO=static DNS1=192.168.1.1 DNS2=8.8.8.8 GATEWAY=192.168.1.1 IPADDR=192.168.1.2 NETMAS=255.255.255.0 ONBOOT=yes I know some of the options are inconsistent (DNS and BOOTPROTO) because I tried changing those in the eth0 file to make it work, and the changes haven't adversly affected web browsing or the other functionality Thank you!

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• "/etc/init.d/networking restart" with non-root user

  - by bonchen

  I have a thin client with 112mb RAM which boots ubuntu server 12.04.1 from a usb drive with openbox and it is to be used by students to communicate with cisco equipment. And because of this the students need to be able to reconfigure the network interface and then restart it without a reboot using the only user - cisco. This is what I have so far: adduser cisco usermod -a -G dialout cisco chown root:cisco /etc/network/interfaces chmod 664 /etc/network/interfaces chmod u+s /sbin/shutdown chmod u+s /sbin/reboot chmod u+s /sbin/poweroff chmod u+s /run/network/if* chmod u+s /sbin/ifdown chmod u+s /sbin/ifup And when I run /etc/init.d/networking restart as cisco I get: *Reconfiguring network interfaces... rm: cannot remove `eth0.dhclient': Permission denied Failed to send flush request: Operation not permitted RTNETLINK answers: Operation not permitted Any ideas on how to get this working? Thanks!

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• Virtualbox: host only networking - proxy internet connection

  - by Russell

  I'll ask my question first, then give details about where I am coming from: Is it possible to use host only, then have ubuntu act as a proxy to provide internet access to windows? If so, how? I am trying to get the right combination of networking for my virtualbox windows client VM (win7). My host is ubuntu 10.10 (maverick). I believe I understand the basic network options (please correct me if I am incorrect): NAT - Host can't communicate with guest but guest has access to all host's adapters Host only - Separate adapter but guest has no net access Bridged - bridge an adapter in the host with the virtual adapter to give the host access to the host adapter I am trying to give my win guest internet access, but also access the host in a separate network. Bridged only works when the host is connected to the internet (this is a laptop) so when it's not connected the network is down. Thanks I appreciate your help.

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• Database vs Networking

  - by user16258

  I have completed my diploma in (IT) and now pursuing degree, i am in last semester of my B.E(I.T). I want to do specialization either in Database(oracle) or in Networking(cisco). Which one of two will be in more demand in near future, i know it's all about interest but still i would like to know your opinion. Most of people say that a network engineer is never paid as better as a programmer or a DBA, and few says they do get paid well. What would be the scope if i clear my CCNA and CCNP exams, or either OCA & OCP exams, what would be more rewarding. Also i have read somewhere that most of the task of DBA will be automated so in future demand of a DBA will reduce. I would also like to hear from Network engineers what's the scenario out there in India. Thanks

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• Enable networking without the gnome-applet

  - by Ikke

  I've switched to XMonad as my window manager. Sometimes when I put my laptop to hibernate, it's hanging and won't shut down. I have to force it off by pressing the powerbutton for 5 seconds. After I boot again, I can't connect to the internet. I have to logout, go to gnome, and after logging in, I rightclick the network applet icon and select the enable networking options. After that, my internet is working again. Is there a way to do this via the command line or another option?

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• frame lock networking

  - by kochol

  I'm developing an RTS game and I want to add multiplayer support to my game. I picked the easiest technique to implement for start frame locking technique. I used server client networking architecture (I think it's my first mistake I think using peer to peer is a better one for this) On game update every clients send their commands and maybe receive some command then render the frame and wait for all clients to send their update complete message then all of them can go for the next frame. I send commands and all logic is calculated on the clients based on commands but the clients can go out of sync easily. Every AI controlled units make different decisions on each clients What I have to do to sync my game? Do you suggest me a better network architecture or technique?

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• What good Social Networking Site solutions there is?

  - by ZetsubouWebmaster

  What good free Social Networking Site solutions there are? I tried many options but most of them are either too complicated, too simple, or just do not work... I tried: Dolphin, DZOIC-Handshakes, elgg, Oxwall, SocialEngine, and some plugins for wp and other cms. I don't need much, just: groups, chats, forums, profiles, PM, photos, pages, comments, search, statistics. Most of which included in pretty much every CMS out there... but not all... So, what good solutions there are? Also I don't mind paying some money (i guess no more then 200$), but I'd prefere if it was a free open source engine. Of course it should be php+mysql based.

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• xna networking, dedicated server possible?

  - by Jake

  Hi I want to release my xna game to the XBOX platform, but I'm worried about the networking limitations. Basically, I want to have a dedicated (authoritative) server, but it sounds like that is not possible. Which is why I'm wondering about: a.) Using port 80 web calls to php-driven database b.) Using an xbox as a master-server (is that possible?) I like the sound of [b] , because I could write my own application to run on the xbox, and I would assume other users could connect to it similar to the p2p architecture. Anyone able to expand on theory [b] above? or [a] as worst-case scenario?

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• client subscribed to a multicast group not receiving data

  - by Abruzzo Forte e Gentile

  I have a network that was setup for multicast traffic IN Machine A there is a server application generating multi-cast traffic. I have also different clients subscribing to that mulicast traffic -some client are in the same machine A -other clients are in machine B,C,D # Address I am using IP : 239.193.0.21 PORT: 20401 I don't know why but the client in machine A , even if they join the group, don't receive any data while (and this is the funny part) machine B,C and D receive everything. Checking with Wirshark I can see that the UDP traffic flow is there in Machine A. I am using LInux/Red-Hat Enterprise 6.2 What should I look at? Any setting in the os? Firewall or what?

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• Ways to have audio output without wires

  - by viraptor

  I'm trying to find a way of using my home speakers/amp without actually having to connect them. There are two laptops that use them normally (so I don't like changing the connection all the time) and I'd rather move the speakers to a place that's away from the couch. I'm not sure how to do this though... The options I can think of are: some kind of wireless jack-jack connection finally getting a media server Unfortunately I can't find any good product for the first solution. I've seen some headphones which have the receiver integrated and a separate transmitted, so in general the idea is already out there, just not the way I need ;) I've seen also http://www.miccus.com/products/blubridge-mini-jack, but I'd have to have a compatible receiver which I can't find on its own (maybe there's some application that the media server could use?). As far as media server goes... many of the plug servers look really interesting, but I'm not sure how to create an audio output and how to redirect the input really. None of the plug servers I've seen so far advertises the option of audio output jack port. I think this part could be fixed by getting one with an usb port and a separate cheap usb soundcard. I hope that input can be sorted out in some rather simple way. I've got Linux running on both laptops so I hope that would be possible to configure jack/pulse/whatever to use the remote endpoint, or even write a simple local-/dev/dsp:network:media-server-/dev/dsp forwarder. So the main question is... are there better ways? Are there any out of the box solutions? Or maybe this was already done by someone and described somewhere?

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• Routing between two networks on linux?

  - by gGololicic

  I got stuck with one problem I cant find solution. I have linux pc with two NIC. first nic (eth1) is connected to public ip (probably switch or whatever, doesnt really mater) so eth1 is connected to wan and another eth0 that I connected to switch and make it a lan nic. configuration: eth1 ip address 88.200.1xx.xxx //xxx's are cuz of security reasons eth0 ip address 192.168.1.1 wan ------ [eth1 (linux PC) eth0]<----[switch]<---- [eth1 (PC1)] Now I want to connect this two networks, so PC1 can access linux PC and wan. I think I know how to do it but I cant confiugre it right. This is what I tried: I turend on ip forwarding (for sure) I set eth1 default gw to the right ip on the wan I tried to set eth0 default gw to the same ip (but i couldnt) What or how can I do this, I was trying with linux route command, but I got stuck. Please help.

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• Problems setting up VLC Sever/client streaming

  - by Ayos

  I'm trying to set up a Linux machine as the server and a Windows XP machine as the client. Both machines are connected to the same local network via a Wi-Fi router. I setup the stream with the following properties : http stream port 8080 play locally And not much else. No firewall on the windows client(Windows firewall is disabled) When I try to open network stream via the client machine(Using VLC or Windows Media Player) I get the following errors: Media Player error code : 0xC00D11B3: Encountered a network Problem. VLC Console: main warning: connection timed out access_mms error: cannot connect to 192.168.1.3:8080 main debug: no access module matching "http" could be loaded main debug: TIMER module_need() : 12625.810 ms - Total 12625.810 ms / 1 intvls (Avg 12625.809 ms) main error: open of `http://192.168.1.3:8080' failed main debug: dead input main debug: repeating item main debug: starting playback of the new playlist item main debug: resyncing on http://192.168.1.3:8080 main debug: http://192.168.1.3:8080 is at 0 main debug: creating new input thread main debug: Creating an input for 'http://192.168.1.3:8080' main debug: using timeshift granularity of 50 MiB, in path 'C:\DOCUME~1\Accer\LOCALS~1\Temp' main debug: `http://192.168.1.3:8080' gives access `http' demux `' path `192.168.1.3:8080' main debug: creating demux: access='http' demux='' location='192.168.1.3:8080' file='\\192.168.1.3:8080' main debug: looking for access_demux module: 0 candidates main debug: no access_demux module matched "http" main debug: TIMER module_need() : 0.461 ms - Total 0.461 ms / 1 intvls (Avg 0.461 ms) main debug: creating access 'http' location='192.168.1.3:8080', path='\\192.168.1.3:8080' main debug: looking for access module: 2 candidates access_http debug: http: server='192.168.1.3' port=8080 file='' main debug: net: connecting to 192.168.1.3 port 8080 qt4 debug: IM: Deleting the input main debug: TIMER input launching for 'http://192.168.1.3:8080' : 13397.979 ms - Total 13397.979 ms / 1 intvls (Avg 13397.978 ms) qt4 debug: IM: Setting an input Need Help. Thanks in advance.

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• resolv.conf doesn't get set on reboot when networking is configured for static ip

  - by kenneth koontz

  I'm experiencing, what appears to be a hostname resolution issue in ubuntu 12.04 server edition when configuring my computer to use a static ip. In /etc/network/interfaces: # The primary network interface auto eth0 iface eth0 inet static address 192.168.1.28 netmask 255.255.255.0 gateway 192.168.1.1 Running $ sudo apt-get upgrade, results in a 'Failed to fetch...': . . . W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-backports/universe/i18n/Translation-en_US Something wicked happened resolving 'us.archive.ubuntu.com:http' (-5 - No address associated with hostname) W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-backports/universe/i18n/Translation-en Something wicked happened resolving 'us.archive.ubuntu.com:http' (-5 - No address associated with hostname) E: Some index files failed to download. They have been ignored, or old ones used instead. When I change my /etc/network/interfaces to: auto eth0 iface eth0 inet dhcp Everything works fine. Looking into /etc/resolv.conf provides some more hints...In cases where I was getting the resolving issue, resolve.conf was empty. No nameservers were specified. When I changed to dhcp from static and restarted networking. /etc/resolv.conf gets written to: 'nameserver 192.168.1.1'. Switching back from dhcp to static and restarting doesn't remove the nameserve entry. When I restart the system with static set, resolv.conf is empty. When I restart the system with dhcp set, resolv.conf has nameserver 192.168.1.1. So it appears that the issue is that resolve.conf is not getting written to correctly? Which package/code is responsible for writing to resolv.conf? Is there a particular package that I can take a look at open issues? UPDATE: istream posted a good article discussing changes to resolve.conf in 12.04. http://www.stgraber.org/2012/02/24/dns-in-ubuntu-12-04/

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