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• Is the TCP protocol good enough for real-time multiplayer games?

  - by kevin42

  Back in the day, TCP connections over dialup/ISDN/slow broadband resulted in choppy, laggy games because a single dropped packet resulted in a resync. That meant a lot of game developers had to implement their own reliability layer on top of UDP, or they used UDP for messages that could be dropped or received out of order, and used a parallel TCP connection for information that must be reliable. Given the average user has faster network connections now, can a real time game such as an FPS give good performance over a TCP connection?

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• WiFi slow sometimes, reboot helps, how do I debug it?

  - by January

  Ubuntu 12.04.1 with all updates installed. Laptop Lenovo Thinkpad X230 with Intel Corporation Centrino Advanced-N 6205. WiFi sometimes becomes extremely slow. Often this occurs when I wake the system from suspend and connect to a different network. I find no obvious clues in system logs. /etc/init.d/network-manager restart doesn't help, but a reboot does. How can I go on with debugging this issue? In specific, which parts of the system should I try to restart (without a complete reboot)? I know of problems with Intel WiFi (see for example this question and the instructions here), but if that was the problem, I would expect the WiFi to be slow at all times, and not just sometimes. Also, I have a gut feeling that it might be a DNS issue (for example, getting a page from a known server is faster than accessing a new server), but I don't know how to tackle it. Update: despite numerous updates in the meanwhile, I still observe this behavior. It happens always when I access my WiFi router at home after returning from work; when I reboot my laptop, the connection speed is good again.

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• UFW blocking random packets on 443

  - by s2jcpete

  All, I have UFW setup to allow traffic on port 443. It works as expected, though I have a large amount of UFW Block log entries. To Action From -- ------ ---- 80 ALLOW Anywhere 443 ALLOW Anywhere 22222 ALLOW Anywhere 80 ALLOW Anywhere (v6) 443 ALLOW Anywhere (v6) 22222 ALLOW Anywhere (v6) However in my syslog file I see this: [UFW BLOCK] IN=eth0 OUT= MAC=XXX SRC=<foreignip> DST=<serverip> LEN=40 TOS=0x00 PREC=0x00 TTL=116 ID=22025 DF PROTO=TCP SPT=49622 DPT=443 WINDOW=0 RES=0x00 ACK RST URGP=0 About 30 or so seconds later pound (which I'm using for SSL decryption and port redirection) throws a connection timed out messsage. I'm assuming this is because UFW is blocking the packet. I'm at a loss as to an explination. Could the packet be malformed or something, is this normal? Edit - I have since changed the /etc/defaults/ufw and set ipv6=no, so the v6 rules are no longer in the mix. The server is still showing the block / connection timed out behavior though. The new ufw status output is: Status: active Logging: on (low) Default: deny (incoming), allow (outgoing) New profiles: skip To Action From -- ------ ---- 80 ALLOW IN Anywhere 443 ALLOW IN Anywhere 22222 ALLOW IN Anywhere

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• How to set up an ethernet and wireless network using /etc/network/interfaces?

  - by den-javamaniac

  Hi. Currently I have ethernet and wireless networks configured through a network manager (further NM) but it seems to be a bit buggy (I need a different MAC for ether which is never applied if using NM), so I would like to move all the network configs to interfaces file. I know (or can google for) configuration code, but I'm not sure how NM works and it looks like it overrides interface config. Please advice, how I can handle this issue. NOTE: I also would like to be able to locate and connect to various wireless networks but not sure how to do it.

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• How to setup a wifi ap hotspot with ipv6 support?

  - by keyman

  How to setup a wifi ap (access point mode) hotspot, with IPv6 support? I've set up a hotspot according to the guide to wifi ap hotspot setup and it works fine. But via the hotspot I failed to visit IPv6 websites. How can I setup a hotspot able to share Ipv6 Internet access? Thanks! Further: Actually I've tried to setup IPv6 forwarding and masquerading. First enabling IPv6 forwarding: echo 1 | sudo tee net/ipv6/conf/default/forwarding Then I tried to execute: sudo ip6tables -t nat -A POSTROUTING -s 2001:db8:0:1::/64 -o eth0 -j MASQUERADE But it gave me an error: ip6tables v1.4.12: Couldn't load target `MASQUERADE':No such file or directory I searched through the Internet but I get confused. So I'm here for help. Thanks!

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• connecting ubuntu with 7 via network cable

  - by VeXe

  i was tryin to connect my ubuntu toshiba satalite L650 laptop with my desktop via a network cable so that i can share things and remotely control the desktop from the laptop, i googled the problem out and found a guide page , i followed all the steps , i installed samba, i had the two computer have the same workgroup name , i had everything correct, but i still dont see connection estbalished between the two computers, (neither one is visible to the other) what is missing ? thanx in advance.

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• Fixing IP Renewal After Laptop Suspend

  - by Cerin

  I have a laptop running Ubuntu 10.04, and I've noticed that with some wifi networks, but not all, I'm unable to reconnect after coming out of suspension. I've tried both Network Manager and Wicd management daemons, and both get through validation, but get hung up on "Acquiring IP address...". The only solution I've found is to reboot the machine, after which it acquires an IP address very quickly. What's the underlying issue here? What would be a more efficient way to resolve the problem? EDIT: I've noticed that if I open Wicd and manually press "Connect", it fails to acquire an IP. However, if I do nothing and let it automatically try and connect, it acquires an IP and connects just fine...

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• Ubuntu Server 12.04 as a router. Problem with DNS?? Or Routing table?

  - by Lorenzo

  I have a virtualbox lab made up of 4 Windows 2008 R2 servers (DC/DNS,SQL,SHAREPOINT, EXCHANGE) that are configured with static ip addresses with NIC's attached to Internal network. Everything works. I had the requirement to execute some tests that also access external services available on the internet. To keep things clean and similar to the production environment I have installed another VM, with Ubuntu Server 12.04 64 bit and configured (I hope) to work as a router like described on this post. This VM has two network interfaces: first is Bridged with the host and is used as a WAN connection and the other one attached in the Internal Network with its own static IP address on the internal network subnet. But actually the Windows servers does not connect to the internet while the unix one connects. I did a route command. this is the result: Kernel IP Routing table Destination Gateway Genmask Flags Metric Ref Use Iface default 10.69.121.1 0.0.0.0 UG 100 0 0 eth0 10.69.121.0 * 255.255.255.0 U 0 0 0 eth0 192.168.83.0 * 255.255.255.0 U 0 0 0 eth1 Can somebody help me with this configuration? :) Thanks! Addendum: I forgot to mention that one of the windows server hosts a DNS service for which I should maybe configure a forwarding server but I do not exactly know which server to forward on... :(

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• Connection timed out when connecting to a website (ubuntu only)

  - by S.C.

  I've been struggling with these problem for months. It happens randomly and it happens on Ubuntu only (12.04). It's about my hosted company website. Some facts: I can ping it I can traceroute it I can dig it I can make a nslookup But whenever I try to open it in Chrome it won't open. I also tried using polipo but got same connection time out issue. I'm connected through a LAN network and I'm experiencing no problem with any other website. Is there a more accurate debugging technique I'm missing other than pinging/tracerouting, etc.?

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• Ubuntu Desktop on PC as an IPv6 router?

  - by Cliff

  I have a DELL PC with Ubuntu 12.10 and a pandaboard running the latest linaro ubuntu 12.08. The Ethernet on the panda board is reporting 'no ipv6 router present' regardless of what router I connect (they are all probably not ipv6). I can connect via a cross-over Ethernet cable the pandaboard to the DELL PC. Can I setup the DELL PC to act as an IPv6 router. the PC has a wireless connect to our router/ADSL box. I would Really appreciate some help here so if you have an alternative please suggest it.

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• WiFi AdHoc Network: Unable to access peer by ip

  - by Pranav

  I've set up a WiFi AdHoc network in Maverick and selected the IPv4 settings as "Shared to other computers". On the client computer, I joined the network with the same SSID and set IPv4 method to Manual and I gave it an IP 10.42.43.2 (As on the first computer, the auto generated IP was 10.42.43.1). From either of the computers, I'm not able to access the other using the IP (in browser). Any idea why? (If I browse to 10.42.43.1 from the first computer, it works) Thanks!

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• YUM and RPM crash due to the liblua-5.1 library being missing

  - by A troubled linux newbie.

  I've been playing around with a LiveUsb install of basic Fedora with persistence. I attempted to install moonscript, which requires Lua and LuaRocks. After installing Lua and discovering there were flaws in the install which prevented LuaRocks from working, I used rpm to force Lua off so I could use yum to re-install it. The result was an error of this sort being yielded by both rpm and yum: There was a problem importing one of the Python modules required to run yum. The error leading to this problem was: liblua-5.1.so: cannot open shared object file: No such file or directory I've concluded from this that my Lua version installed a library which both yum and rpm are now connected to. Is there anyway to fix this without reformatting my drive and installing everything from scratch?

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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 find 3g modem signal strength with out AT commands?

  - by neckTwi

  when i try to find signal strength of my modem using AT+CSQ, the usb device is locked by the network manager. To find the signal strength with AT+CSQ i have to first disable network connection using #nmcli nm wwan off to unlock the device inode /dev/ttyUSBX. Is there any nmcli option to get signal strength or any other option? EDIT The gdbus object for NetworkManager don't have any method like getSignalStrength. Network manager is locking device file preventing to use AT commands. nm-applet was able to display signal strength in system tray. so there should be a way to get signal strength form network manager! nmcli is command line counter part of nm-applet. Can i get signal strength using nmcli? nothing about signal strength is mentioned in its man pages.

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• Advice on how to understand in general and in practice IT Infrastructure

  - by Luca

  My IT knowledge resides mainly in SW development. I have just some basic know how about networks. On the net I tried to get information and read books in order to better understand the overall IT infrastrcuture, but all the sources I found are too generic or, mainly, too detailed in just one aspect, making me lost. Could anyone suggest some books or web resources as good compromise in details? My goal would be able to understand the network issues and security threats when, for example, two remote system have to be setup and put in connection each other. Considering this scenario there are several aspects to consider: firewalls, intranet/internet interconnections, certificates for httpS, etc. The argument is quite wide, therefore I was looking for something that might help to start to understand this subject without going too deep in details (Computer Networks from A.Tanenbaum is a wonderful milestone, but way too specific for my scope). Thanks

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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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• How to insert in a blog sharing links to visitors Tweet, Facebook and so on social networks?

  - by Andry

  I am developing a web blog using ASP.NET, but I guess that the tech details like this, here, is not important. My aim is to insert in every post I create those nice buttons to the social networks account of my visitors so that they can quote or post the link to the blog entry in their space. How can I do this? I guess it also de3pend on the social network I want to use. Lets say, now, that I want to have links to Facebook, Tweet and Google circle accounts. Thankyou.

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• mount remotely mybook live network drive

  - by bob

  I have a mybook live western digital 1TB hard disk connected to fritzbox 7270 router in office. When I am in the office, I can mount this drive to ubuntu since I have added to the etc/fstab file: //192.168.178.30/user /home/user/DISK cifs auto,iocharset=utf8,user=user%password 0 0 Is there a similar, easy & safe way, to do the same when I am out of the office using the static IP of the fritzbox router? I have already added tcp port forwarding in the router for ports 8080 (to 80 of the disk) and 8443 (to 443 of the disk). Thank you in advance

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• How to set system-wide proxy address using shell script?

  - by skg

  I want to set system Proxy address through my Qt application. So i was wondering if i could write a script which can be executed by my application every time to change the proxy address. I tried : #! /bin/sh echo "# Generated by Application" export $1 echo "Proxy Address ${1} but this script was not successful. I think it was unable to execute "export" command. Can anyone help me resolving this issue ?

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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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• How to connect ethernet on ubuntu (with auto-detection by Ubuntu)

  - by user12285

  Do I need to post another thread for the same? If so, sorry. Yes, I saw that it's been well over six months but I have the same router SmartAX MT880d with ethernet, and the exact same problem, that is no internet even though I can successfully reach the modem settings page by entering 192.168.1.1 in Firefox. Sorry if I don't use the right (technical) terminology to express my issue. English is not my mother tongue. I'm a total beginner with ubuntu. My internet works great in Windows but does not work in Ubuntu. For 2 weeks, I've kept reading on the web and forums and the ubuntuguide.org to name a few but to no avail. Now I see no other solution but to ask for help. My problem is that as a beginner, I can't find a way to put the right digits in the right place because I don't know what numbers I need to put in what files (eg: do I need to use DHCP? or a static IP address? No clue whatsoever. I'm confused between putting figures in the wrong spaces. For example, is the modem/router's IP exactly 192.168.1.1 for Huawei Smart AXMT880d modem?? Is the subnet 255.255.255.0? Gateway 192.168.1.1. I'm confused as I can also see a different IP starting with 155131*** (is it an account number? no clue again) on my contract with Huawei (a Chinese ISP). Apart from calling 911, what other numbers do I need to put in and where? How do I check that all the numbers have been entered correctly in every appropriate space before trying to connect the Internet?

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• Internet slow on one router only [the problem only in Ubuntu] [on hold]

  - by mrSuperEvening

  Internet works perfectly on every other router, but browsing sucks at home (slow browsing and slow loading times). I changed DNS servers to 8.8.0.0, still doesn't help. And funnily, download speed is extremely high on this network (meaning torrents for example), but using browsers and loading websites is extremely slow (only on this network). Do I need to change something in router settings or what can I try? By the way, I use wired connection to router. EDIT: There's no problems when using Windows. EDIT: ifconfig: eth0 Link encap:Ethernet HWaddr f2:4d:a0:c0:3f:4c inet addr:192.168.11.8 Bcast:192.168.11.255 Mask:255.255.255.0 inet6 addr: fe80::f24d:a2ff:fec6:3f4c/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:206798 errors:0 dropped:0 overruns:0 frame:0 TX packets:219570 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:76680734 (76.6 MB) TX bytes:21738160 (21.7 MB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:160 errors:0 dropped:0 overruns:0 frame:0 TX packets:160 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:11094 (11.0 KB) TX bytes:11094 (11.0 KB)` ping -c 2 4.2.2.2 PING 4.2.2.2 (4.2.2.2) 56(84) bytes of data. --- 4.2.2.2 ping statistics --- 2 packets transmitted, 0 received, 100% packet loss, time 1007ms ping -c 2 google.com PING google.com (213.159.32.147) 56(84) bytes of data. 64 bytes from lan-213-159-32-147.kns.skynet.lv (213.159.32.147): icmp_seq=1 ttl=61 time=0.936 ms 64 bytes from lan-213-159-32-147.kns.skynet.lv (213.159.32.147): icmp_seq=2 ttl=61 time=0.937 ms --- google.com ping statistics --- 2 packets transmitted, 2 received, 0% packet loss, time 1001ms rtt min/avg/max/mdev = 0.936/0.936/0.937/0.030 ms

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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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• Driver for asus wireless PC card WL-100GE

  - by emab

  I have bought an Asus wireless LAN PC Card WL-100GE model, and I am using lubuntu on my system. While I have no cable connection, currently I cannot access the internet and update my laptop. Device: Broad Range Wireless Card Bus Adaptor - Asus - WL-100GE I searched the web and couldn't find any adequate driver for it. Is there any solution for it? My sudo lshw -C network output is: *-network description: Ethernet interface product: RTL-8100/8101L/8139 PCI Fast Ethernet Adapter vendor: Realtek Semiconductor Co., Ltd. physical id: 3 bus info: pci@0000:02:03.0 logical name: eth0 version: 10 serial: 00:02:3f:ba:55:c8 size: 10Mbit/s capacity: 100Mbit/s width: 32 bits clock: 33MHz capabilities: pm bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation configuration: autonegotiation=on broadcast=yes driver=8139too driverversion=0.9.28 duplex=half latency=128 link=no maxlatency=64 mingnt=32 multicast=yes port=MII speed=10Mbit/s resources: irq:19 ioport:3000(size=256) memory:e0200800-e02008ff *-network description: Network controller product: BCM4318 [AirForce One 54g] 802.11g Wireless LAN Controller vendor: Broadcom Corporation physical id: 1 bus info: pci@0000:07:00.0 version: 02 width: 32 bits clock: 33MHz capabilities: bus_master configuration: driver=b43-pci-bridge latency=64 resources: irq:21 memory:38000000-38001fff ----:~$ iwconfig lo no wireless extensions. eth0 no wireless extensions.

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• Unable to remove network proxy

  - by Rushil

  I'm on 11.10 I'd set up a network proxy a couple of days back from system settings .And afterwards I'd set my proxy method back to none. However, my proxy has not been removed. I know this because: a: 127.0.0.1 routes me to the index.html file in the base directory of the proxy server. b: I'm able to access my university internet after hours. I checked my /etc/environment and etc/apt/apt.conf file and both of them have no proxy details. I also tried resetting the proxy and then getting rid of it but that didn't work either.

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